Spartium junceum

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Donato Chiatante - One of the best experts on this subject based on the ideXlab platform.

  • the influence of slope on Spartium junceum root system morphological anatomical and biomechanical adaptation
    Journal of Plant Research, 2017
    Co-Authors: Fabio Lombardi, Gabriella S. Scippa, Bruno Lasserre, Antonio Montagnoli, Roberto Tognetti, Marco Marchetti, Donato Chiatante
    Abstract:

    Root systems have a pivotal role in plant anchorage and their mechanical interactions with the soil may contribute to soil reinforcement and stabilization of slide-prone slopes. In order to understand the responses of root system to mechanical stress induced by slope, samples of Spartium junceum L., growing in slope and in plane natural conditions, were compared in their morphology, biomechanical properties and anatomical features. Soils sampled in slope and plane revealed similar characteristics, with the exception of organic matter content and penetrometer resistance, both higher in slope. Slope significantly influenced root morphology and in particular the distribution of lateral roots along the soil depth. Indeed, first-order lateral roots of plants growing on slope condition showed an asymmetric distribution between up- and down-slope. Contrarily, this asymmetric distribution was not observed in plants growing in plane. The tensile strength was higher in lateral roots growing up-slope and in plane conditions than in those growing down-slope. Anatomical investigations revealed that, while roots grown up-slope had higher area covered by xylem fibers, the ratio of xylem and phloem fibers to root diameter did not differ among the three conditions, as also, no differences were found for xylem fiber cell wall thickness. Roots growing up-slope were the main contributors to anchorage properties, which included higher strength and higher number of fibers in the xylematic tissues. Results suggested that a combination of root-specific morphological, anatomical and biomechanical traits, determines anchorage functions in slope conditions.

  • Adaptive longitudinal growth of first-order lateral roots of a woody species (Spartium junceum) to slope and different soil conditions—upward growth of surface roots
    Environmental and Experimental Botany, 2007
    Co-Authors: Antonino Di Iorio, Gabriella S. Scippa, Bruno Lasserre, Livio Petrozzi, Donato Chiatante
    Abstract:

    Abstract First-order lateral roots originating in the upper part of the taproot of a woody species, usually termed surface roots, grow close beneath the soil surface, even on irregular or sloping ground. In slope condition, in fact, the surface roots can assume upward as well as downward growth. Existing knowledge on the controls over root direction does not fully explain these field observations. Two different soil types and sloping conditions were selected in field condition to explore the behaviour of the surface roots in the woody species Spartium junceum L. The root system 3D architecture was measured with a 3D digitizer and the angle of growth (0° = vertically downwards) and the radial direction (0° = horizontally downslope or northwards) of all root segments measured. Surface roots were more numerous in clay soil than in loam soil, independently from the slope inclination. They had initial angles larger than 90°, i.e. they grew upwards only in clay soil. The subsequent angles of growth maintained this value only in steep-slope condition, showing a clear soil type x slope inclination interaction. The initial angle of all first-order lateral roots decreased linearly with depth of origin on the taproot always in relation to the soil type, with this relationship being stronger in clay soil. These findings showed that the liminal angle (the preferred angle of growth) of surface roots was mainly affected by the soil type rather than the soil surface inclination. Thus, upward growth must stand in the plasticity of the plagiotropic response of these secondary laterals rather than in a strong internal control.

  • Modification of root architecture in woody plants is possible for the presence of two different mechanisms of lateral root production: The effect of slope in Spartium junceum L. seedlings
    Plant Biosystems - An International Journal Dealing with all Aspects of Plant Biology, 2007
    Co-Authors: Donato Chiatante, Angelo Di Iorio, Gabriella S. Scippa
    Abstract:

    Abstract This paper investigates the modification of root architecture of Spartium junceum L. seedlings grown in slope condition. It is reported that 50% of the total number of lateral roots are concentrated in few centimetres of the taproot near the collar. The anatomical analysis of transverse sections along the taproot axis reveals that this taproot zone is characterised by two types of lateral roots: one with a trace extending to the centre of the vascular cylinder by following the path of a medullar ray; one with a trace which ends in the vascular cambium. The first type may be lateral roots originated from the taproot primary structure; the second type seems to be lateral roots developing later when a secondary structure has completely substituted the primary structure. The emission of this second type of lateral roots seems to be strongly controlled by environmental conditions with considerable consequences upon the overall root architecture. In the example reported in this paper, young plants grow...

  • A proteomic analysis of Spanish broom (Spartium junceum L.) root growing on a slope condition
    Plant Science, 2006
    Co-Authors: Michela Di Michele, Donato Chiatante, Christophe Plomion, Gabriella S. Scippa
    Abstract:

    Abstract The stability of plants growing on a slope may be affected by factors that tend to uproot the plant. To avoid uprooting, roots undergo complex, finely regulated changes. Spanish broom ( Spartium junceum L.) is a widespread Mediterranean legume that frequently grows on slopes. Using two-dimensional polyacrylamide gel electrophoresis (2D-PAGE) we compared the protein patterns of S. junceum roots grown in a greenhouse in either upright or tilted pots. We obtained about 1000 protein spots that were highly reproducible across an isoelectric focusing range 4–7. The protein profile of 141 spots differed significantly ( p http://cbi.labri.fr/outils/protic/ProticDB.php.

  • The Response of Spartium junceum Roots to Slope: Anchorage and Gene Factors
    Annals of botany, 2005
    Co-Authors: Gabriella S. Scippa, Michela Di Michele, Antonino Di Iorio, Antonello Costa, Bruno Lasserre, Donato Chiatante
    Abstract:

    • Background and Aims Plant anchorage is governed by complex, finely regulated mechanisms that occur at a morphological, architectural and anatomical level. Spanish broom (Spartium junceum) is a woody plant frequently found on slopes—a condition that affects plant anchorage. This plant grows throughout the Mediterranean area where it plays an important role in preventing landslides. Spanish broom seedlings respond promptly to slope by altering stem and root morphology. The aim of this study was to investigate the mechanisms whereby the root system of Spanish broom seedlings adapts to ensure anchorage to the ground. • Methods Seedlings were grown in tilted and untilted pots under controlled conditions. The root apparatus was removed at different times of growth and subjected to morphological, biomechanical and molecular analyses. • Key Results In slope-grown seedlings, changes in root system morphology, pulling strength and chemical lignin content, all features related to plant anchorage in the soil, were related to seedling age. cDNA-AFLP analysis revealed changes in the expression of several genes in root systems of slope-grown plants. BLAST analysis showed that some differentially expressed genes are homologues of genes induced by environmental stresses in other plant species, and/or are involved in the production of strengthening materials. • Conclusion Plants use various mechanisms/strategies to respond to slope depending on their developmental stage.

Gabriella S. Scippa - One of the best experts on this subject based on the ideXlab platform.

  • the influence of slope on Spartium junceum root system morphological anatomical and biomechanical adaptation
    Journal of Plant Research, 2017
    Co-Authors: Fabio Lombardi, Gabriella S. Scippa, Bruno Lasserre, Antonio Montagnoli, Roberto Tognetti, Marco Marchetti, Donato Chiatante
    Abstract:

    Root systems have a pivotal role in plant anchorage and their mechanical interactions with the soil may contribute to soil reinforcement and stabilization of slide-prone slopes. In order to understand the responses of root system to mechanical stress induced by slope, samples of Spartium junceum L., growing in slope and in plane natural conditions, were compared in their morphology, biomechanical properties and anatomical features. Soils sampled in slope and plane revealed similar characteristics, with the exception of organic matter content and penetrometer resistance, both higher in slope. Slope significantly influenced root morphology and in particular the distribution of lateral roots along the soil depth. Indeed, first-order lateral roots of plants growing on slope condition showed an asymmetric distribution between up- and down-slope. Contrarily, this asymmetric distribution was not observed in plants growing in plane. The tensile strength was higher in lateral roots growing up-slope and in plane conditions than in those growing down-slope. Anatomical investigations revealed that, while roots grown up-slope had higher area covered by xylem fibers, the ratio of xylem and phloem fibers to root diameter did not differ among the three conditions, as also, no differences were found for xylem fiber cell wall thickness. Roots growing up-slope were the main contributors to anchorage properties, which included higher strength and higher number of fibers in the xylematic tissues. Results suggested that a combination of root-specific morphological, anatomical and biomechanical traits, determines anchorage functions in slope conditions.

  • Adaptive longitudinal growth of first-order lateral roots of a woody species (Spartium junceum) to slope and different soil conditions—upward growth of surface roots
    Environmental and Experimental Botany, 2007
    Co-Authors: Antonino Di Iorio, Gabriella S. Scippa, Bruno Lasserre, Livio Petrozzi, Donato Chiatante
    Abstract:

    Abstract First-order lateral roots originating in the upper part of the taproot of a woody species, usually termed surface roots, grow close beneath the soil surface, even on irregular or sloping ground. In slope condition, in fact, the surface roots can assume upward as well as downward growth. Existing knowledge on the controls over root direction does not fully explain these field observations. Two different soil types and sloping conditions were selected in field condition to explore the behaviour of the surface roots in the woody species Spartium junceum L. The root system 3D architecture was measured with a 3D digitizer and the angle of growth (0° = vertically downwards) and the radial direction (0° = horizontally downslope or northwards) of all root segments measured. Surface roots were more numerous in clay soil than in loam soil, independently from the slope inclination. They had initial angles larger than 90°, i.e. they grew upwards only in clay soil. The subsequent angles of growth maintained this value only in steep-slope condition, showing a clear soil type x slope inclination interaction. The initial angle of all first-order lateral roots decreased linearly with depth of origin on the taproot always in relation to the soil type, with this relationship being stronger in clay soil. These findings showed that the liminal angle (the preferred angle of growth) of surface roots was mainly affected by the soil type rather than the soil surface inclination. Thus, upward growth must stand in the plasticity of the plagiotropic response of these secondary laterals rather than in a strong internal control.

  • Modification of root architecture in woody plants is possible for the presence of two different mechanisms of lateral root production: The effect of slope in Spartium junceum L. seedlings
    Plant Biosystems - An International Journal Dealing with all Aspects of Plant Biology, 2007
    Co-Authors: Donato Chiatante, Angelo Di Iorio, Gabriella S. Scippa
    Abstract:

    Abstract This paper investigates the modification of root architecture of Spartium junceum L. seedlings grown in slope condition. It is reported that 50% of the total number of lateral roots are concentrated in few centimetres of the taproot near the collar. The anatomical analysis of transverse sections along the taproot axis reveals that this taproot zone is characterised by two types of lateral roots: one with a trace extending to the centre of the vascular cylinder by following the path of a medullar ray; one with a trace which ends in the vascular cambium. The first type may be lateral roots originated from the taproot primary structure; the second type seems to be lateral roots developing later when a secondary structure has completely substituted the primary structure. The emission of this second type of lateral roots seems to be strongly controlled by environmental conditions with considerable consequences upon the overall root architecture. In the example reported in this paper, young plants grow...

  • A proteomic analysis of Spanish broom (Spartium junceum L.) root growing on a slope condition
    Plant Science, 2006
    Co-Authors: Michela Di Michele, Donato Chiatante, Christophe Plomion, Gabriella S. Scippa
    Abstract:

    Abstract The stability of plants growing on a slope may be affected by factors that tend to uproot the plant. To avoid uprooting, roots undergo complex, finely regulated changes. Spanish broom ( Spartium junceum L.) is a widespread Mediterranean legume that frequently grows on slopes. Using two-dimensional polyacrylamide gel electrophoresis (2D-PAGE) we compared the protein patterns of S. junceum roots grown in a greenhouse in either upright or tilted pots. We obtained about 1000 protein spots that were highly reproducible across an isoelectric focusing range 4–7. The protein profile of 141 spots differed significantly ( p http://cbi.labri.fr/outils/protic/ProticDB.php.

  • The Response of Spartium junceum Roots to Slope: Anchorage and Gene Factors
    Annals of botany, 2005
    Co-Authors: Gabriella S. Scippa, Michela Di Michele, Antonino Di Iorio, Antonello Costa, Bruno Lasserre, Donato Chiatante
    Abstract:

    • Background and Aims Plant anchorage is governed by complex, finely regulated mechanisms that occur at a morphological, architectural and anatomical level. Spanish broom (Spartium junceum) is a woody plant frequently found on slopes—a condition that affects plant anchorage. This plant grows throughout the Mediterranean area where it plays an important role in preventing landslides. Spanish broom seedlings respond promptly to slope by altering stem and root morphology. The aim of this study was to investigate the mechanisms whereby the root system of Spanish broom seedlings adapts to ensure anchorage to the ground. • Methods Seedlings were grown in tilted and untilted pots under controlled conditions. The root apparatus was removed at different times of growth and subjected to morphological, biomechanical and molecular analyses. • Key Results In slope-grown seedlings, changes in root system morphology, pulling strength and chemical lignin content, all features related to plant anchorage in the soil, were related to seedling age. cDNA-AFLP analysis revealed changes in the expression of several genes in root systems of slope-grown plants. BLAST analysis showed that some differentially expressed genes are homologues of genes induced by environmental stresses in other plant species, and/or are involved in the production of strengthening materials. • Conclusion Plants use various mechanisms/strategies to respond to slope depending on their developmental stage.

S. Nekkaa - One of the best experts on this subject based on the ideXlab platform.

N. Haddaoui - One of the best experts on this subject based on the ideXlab platform.

  • Effects of Alkaline Treatment on the Mechanical and Rheological Properties of Low-Density Polyethylene/Spartium junceum Flour Composites
    ISRN Polymer Science, 2012
    Co-Authors: S. Ikhlef, S. Nekkaa, M. Guessoum, N. Haddaoui
    Abstract:

    The effects of Spartium junceum (SJ) flour content, treatment time, and temperature on the mechanical and rheological properties of low density polyethylene/Spartium junceum flour (LDPE/SJ) composites were studied. SJ flour was treated with NaOH (5% wt) for 24, 48, and 72 h at 25°C and 40°C. FTIR results showed that there is a partial removal of lignin and hemicelluloses after treatment which improved the interfacial adhesion matrix/SJ flour. Also, the alkaline treatment improved notably the tensile strength and Young's modulus and increased slightly the elongation at break of LDPE/SJ composites compared to those with untreated flour.

  • effects of alkaline treatment on the mechanical and rheological properties of low density polyethylene Spartium junceum flour composites
    International Scholarly Research Notices, 2012
    Co-Authors: S. Ikhlef, S. Nekkaa, M. Guessoum, N. Haddaoui
    Abstract:

    The effects of Spartium junceum (SJ) flour content, treatment time, and temperature on the mechanical and rheological properties of low density polyethylene/Spartium junceum flour (LDPE/SJ) composites were studied. SJ flour was treated with NaOH (5% wt) for 24, 48, and 72 h at 25°C and 40°C. FTIR results showed that there is a partial removal of lignin and hemicelluloses after treatment which improved the interfacial adhesion matrix/SJ flour. Also, the alkaline treatment improved notably the tensile strength and Young's modulus and increased slightly the elongation at break of LDPE/SJ composites compared to those with untreated flour.

  • Mechanical Properties of Biodegradable Composites Reinforced with Short Spartium junceum Fibers before and after Treatments
    International Journal of Polymeric Materials, 2012
    Co-Authors: S. Nekkaa, M. Guessoum, A. C. Grillet, N. Haddaoui
    Abstract:

    In the present study, Spartium junceum (SJ) fibers were chemically treated with different concentrations of two coupling agents, silane N [-3 Trimethoxysilyl propyl] ethylene diamine (Z-6020) and stearic acid, in order to improve the mechanical properties of polypropylene/Spartium junceum fibers (PP/SJ) composites. The chemical modification efficiency was verified by FTIR analysis, which showed the appearance of bands around 1260 and 1100 cm−1 attributed to asymmetric stretching of Si-O-Si linkage and Si-O-Cellulose for (Z-6020) modified SJ fibers. The mechanical properties of the composites prepared from chemically treated Spartium junceum fibers are found to increase substantially compared to those with untreated fibers.

  • Water Absorption Behavior and Impact Properties of Spartium junceum Fiber Composites
    International Journal of Polymeric Materials, 2009
    Co-Authors: S. Nekkaa, M. Guessoum, N. Haddaoui
    Abstract:

    This paper presents the influence of Spartium junceum (SJ) fiber content, surface treatment and temperature on the water uptake of polypropylene/Spartium junceum fiber (PP/SJ) composites. Composites specimens were dried at 70°C to reach a constant weight and then were submerged in distilled water at different temperatures, 23°C and 85°C. Water uptake of PP/SJ fiber composites was found to increase with fiber content. Impact strength properties are dramatically affected by the water absorption. Water-saturated samples present poor impact strength. The SEM micrograph of Spartium junceum fiber untreated and treated with silane (Z-6020) illustrate the reduction of roughness via surface treatment of fiber.

  • Effect of Fiber Content and Chemical Treatment on the Thermal Properties of Spartium junceum Fiber-Reinforced Polypropylene Composites
    International Journal of Polymeric Materials, 2008
    Co-Authors: S. Nekkaa, M. Guessoum, F. Chebira, N. Haddaoui
    Abstract:

    The thermal and crystallization behavior of PP/Spartium junceum fiber composites were studied by thermogravimetry (TGA) and differential scanning calorimetry (DSC). The surface modification of Spartium junceum fibers was carried out using silane coupling agents in order to improve the interfacial adhesion between the fiber and the matrix. The effects of fiber content and chemical treatment on thermal properties were evaluated. It was found that Spartium junceum fiber degraded before the PP matrix but the thermal stability of the PP/Spartium junceum fiber composites was higher than those of the fiber and the matrix. DSC measurements showed that the incorporation of Spartium junceum fiber caused an increase in the crystallinity of the matrix. These effects have been attributed to the fact that the surfaces of Spartium junceum fibers act as nucleating agents for the crystallization of the polymer, promoting the growth and the formation of transcrystalline regions around the fibers.

Zorana Kovačević - One of the best experts on this subject based on the ideXlab platform.

  • DEVELOPMENT OF ADVANCED POLYLACTIDE NANOBIOCOMPOSITE REINFORCED WITH Spartium junceum L. FIBRES
    2019
    Co-Authors: Zorana Kovačević
    Abstract:

    The main goal of this thesis was to develop biodegradable composite material of sustainable origin for possible usage in automotive industry. Increased demand for usage of sustainable and biodegradable natural materials initiated wider production of biocomposites. For that reason, composite materials made of sustainable polylactide (PLA) polymer and Spartium junceum L. (SJL) bast fibres were designed and produced in the course of research for this thesis. Three fibre extraction (maceration) methods were investigated: water retting (WR), osmotic degumming (OD) and alkali retting under the influence of microwave energy (MW). It was proven that long lasting conventional maceration method can be succesfully replaced by ecologically favourable method using microwaves. Tensile strength of MW treated fibres show approximately 60 % higher strength compared to conventional WR and 30 % compared to novel OD method. Functionalization of fibres was carried out using montmorillonite (MMT) nanoclay particles added as a flame retardant nanofiller, and citric acid (CA) as an environmentally friendly crosslinker. Effectiveness of the conducted modifications was examined according to the relevant standardized methods used in current industrial and manufacturing processes (testing of morphological, mechanical, chemical and thermal properties of the final composite material). MMT/CA modified fibres show better thermal stability in comparison to the reference fibre (MWR) which is confirmed with the increase in crystallinity and proved by thermogravimetric analysis by shifting of fibre's onset decomposition temperature to higher value. Fibre/polymer interface was also positively influenced by MMT/CA fibre modification. Therefore, such material has showed higher decomposition temperature at certain weight loss, as well as higher strength and modulus values in comparison to samples without CA. The results indicate formation of crosslinking caused by interactions between the carboxylic acid and –OH groups of cellulose fibre or PLA. Biodegradability of developed composite materials was examined with serine endopeptidase. Concentration of 50 wt% enzyme reveals very positive result of composite degradation. After 5 days of enzymatic treatment, composite material reinforced with MMT/CA modified fibres lost 2.5 % of its initial weight. Additionally, the possibility of residue stem utilization in bioenergy production was investigated. Proximate and ultimate analysis of residues after MW maceration showed increase in content of positive biomass quality indicators. The obtained results confirmed SJL biomass as promising feedstock for solid biofuel production. The significance of the proposed research lies in the application of innovative, sustainable raw materials for the production of new advanced products of wide application.

  • SPANISH BROOM (Spartium junceum L.) – FEEDSTOCK FOR BIOPLASTIC AND BIOENERGY INDUSTRY
    The holistic approach to environment, 2019
    Co-Authors: Zorana Kovačević, Vanja Jurišić, Mateja Grubor, Ana Matin, Tajana Krička, Sandra Bischof
    Abstract:

    Spanish Broom (Spartium junceum L.) is a Mediterranean plant of various usage possibilities. Its fibres were known since ancient time but in some point of last century, more accurately in 1950s, their production was abandoned due to the negative economic effect. Another drawback was large time consumption, especially during the old tradition method – Spanish Broom maceration in salt water. Nowadays, due to technology development and ecological awareness, it is much easier to produce Spanish Broom fibres of enhanced quality. One of the fibre extraction methods is the one assisted with microwave oven. Demerit of such fibre production is in large residue content after obtaining fibres - approx. 90 % of initial Spanish Broom weight. Due to the need for finding sustainable solutions in the development of new materials, the usage of Spanish Broom fibres in the service of reinforcement for biopolymer poly (lactic acid) (PLA) matrix was investigated. Obtained results target our further research into the direction of Spanish Broom fibres and PLA application in the production of green composites. The aim of this research was to prove that developed product can be categorized under the biodegradable group by investigating its degradation properties using serine endopeptidase enzyme. The results show positive degradation effect while using 50 wt.% (on weight of material) enzyme concentration during a 5-day treatment. Stem residues of Spanish Broom plant derived from salty water and microwave maceration were further investigated for their potential as raw material for second-generation biofuel production. Examination of its energy properties consisted of determination of proximate and ultimate properties of the biomass. The results show low moisture content (6.5 % - 7.5 %), ash content below 5 % and higher values of fixed carbon and volatile matter content of 13.2 % and 75 %, respectively. Higher heating values that were determined (17.2 - 18.8 MJ/kg) indicate a high quality biomass that can be used most effectively in solid biofuel production.

  • The influence of pre-treatment of Spartium junceum L. fibres on the structure and mechanical properties of PLA biocomposites
    Arabian Journal of Chemistry, 2019
    Co-Authors: Zorana Kovačević, Sandra Bischof, Edita Vujasinović, Mizi Fan
    Abstract:

    Different chemical pre-treatments of Spartium junceum L. fibres using alkali (NaOH), nanoclay (MMT) and Citric acid (CA) with the aim of producing biodegradable composite material are discussed. As environmental requirements in processing technologies have been higher in recent years, the Polylactic acid (PLA) is used in this research as a matrix, due to its renewability, biodegradability and biocompatibility. Biocomposites are prepared by reinforcing PLA with randomly oriented, short Spartium junceum L. fibres in order to increase material strength. The effects of different pre-treatments of Spartium junceum L. fibres on the mechanical properties of final biocomposite material are examined. Fibre tenacity is studied using Vibroscop and Vibrodyn devices. Tensile strength of biocomposite material was measured on the universal electromechanical testing machine Instron 5584. The results indicate that biocomposites reinforced with fibres modified with MMT and CA show upgraded mechanical properties of the final composite material in comparison with the composite materials reinforced with referenced (nontreated) fibres. Infrared spectra of tested fibres and biocomposites were determined with Fourier transform infrared spectroscopy using Attenuated total reflection (FT-IR ATR) sampling technique and the influence of fibre modifications on the fibre/polymer interfacial bonding was investigated. The interface of Spartium/PLA composites was observed with scanning electron microscope (SEM) and it was clearly visible that biocomposites reinforced with fibres modified by MMT and CA showed better interaction of fibres and matrix.

  • The influence of pre-treatment of Spartium junceum L. fibres on the structure and mechanical properties of PLA biocomposites
    Elsevier, 2019
    Co-Authors: Zorana Kovačević, Sandra Bischof, Edita Vujasinović, Mizi Fan
    Abstract:

    Different chemical pre-treatments of Spartium junceum L. fibres using alkali (NaOH), nanoclay (MMT) and Citric acid (CA) with the aim of producing biodegradable composite material are discussed. As environmental requirements in processing technologies have been higher in recent years, the Polylactic acid (PLA) is used in this research as a matrix, due to its renewability, biodegradability and biocompatibility. Biocomposites are prepared by reinforcing PLA with randomly oriented, short Spartium junceum L. fibres in order to increase material strength. The effects of different pre-treatments of Spartium junceum L. fibres on the mechanical properties of final biocomposite material are examined. Fibre tenacity is studied using Vibroscop and Vibrodyn devices. Tensile strength of biocomposite material was measured on the universal electromechanical testing machine Instron 5584. The results indicate that biocomposites reinforced with fibres modified with MMT and CA show upgraded mechanical properties of the final composite material in comparison with the composite materials reinforced with referenced (nontreated) fibres. Infrared spectra of tested fibres and biocomposites were determined with Fourier transform infrared spectroscopy using Attenuated total reflection (FT-IR ATR) sampling technique and the influence of fibre modifications on the fibre/polymer interfacial bonding was investigated. The interface of Spartium/PLA composites was observed with scanning electron microscope (SEM) and it was clearly visible that biocomposites reinforced with fibres modified by MMT and CA showed better interaction of fibres and matrix. Keywords: Fibres, Polymer-matrix composites (PMCs), Mechanical properties, Mechanical testin

  • The potential of nanoclay modified Spartium junceum L. fibres used as reinforcement in PLA matrix composites for automotive applications
    International Journal of Nanotechnology, 2018
    Co-Authors: Zorana Kovačević, Sandra Bischof, Edita Vujasinović, Mizi Fan
    Abstract:

    Novel bionanocomposite material has been developed using nanoclay modified Spartium junceum L. fibres and PLA matrix. Its potential for the automotive industry was examined. Spartium junceum L. fibres were previously treated with montmorillonite nanoclay (MMT) and citric acid (CA) in order to enhance bionanocomposite thermal and mechanical properties to comply with the automotive industry requirements. After a macromechanics analysis, a comparison was made between experimental and theoretical modelling results. The evaluated tensile modulus and tensile strength of theoretical Hirsch model were in good agreement with those of the tested composites. Tensile strength and modulus of the newly developed advanced material were improved by 164% and 86% respectively, as compared to the pure PLA matrix.

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