The Experts below are selected from a list of 3189 Experts worldwide ranked by ideXlab platform
Anil N Netravali - One of the best experts on this subject based on the ideXlab platform.
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Self-healing starch-based ‘green’ Thermoset Resin
Polymer, 2017Co-Authors: Anil N NetravaliAbstract:Abstract In the present research, self-healing green Thermoset Resin has been developed using waxy maize starch. Self-healing was achieved using waxy maize starch-loaded poly(d,l-lactide-co-glycolide) microcapsules (WMS-PLGA-MCs). Hydroxyl groups of WMS released from WMS-PLGA-MCs can bridge the microcrack surfaces by forming ester linkages between the carboxylic acid groups of Meso-1,2,3,4-butanetetracarboxylic acid (BTCA) used in the Resin as the crosslinker. Self-healing WMS Resin containing 20% WMS-PLGA-MCs by weight showed self-healing efficiency in fracture stress of up to 51% and recovered about 66% of the original fracture toughness after 24 h of healing at room temperature. Self-healing starch-based Resin developed in this study is not only green and sustainable but the fabrication processes including microencapsulation are water-based and can be easily scaled up. The nontoxic starch based green Resin can be useful for fabricating green composites in many indoor applications such as automotive, aerospace and packaging, to replace currently used petroleum-derived composites.
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Nonedible Starch Based “Green” Thermoset Resin Obtained via Esterification Using a Green Catalyst
ACS Sustainable Chemistry & Engineering, 2016Co-Authors: Namrata V. Patil, Anil N NetravaliAbstract:In this study, a biobased Thermoset Resin was developed from a nonedible starch source obtained from mango processing industrial waste. Mango seed starch (MSS) was extracted from defatted mango seed kernels and cross-linked using a “green” cross-linker/catalyst system, 1,2,3,4-butane tetracarboxylic acid (BTCA)/sodium propionate (NaP), to obtain the Thermoset Resin. The tensile properties of the cross-linked MSS were found to be adequate to replace edible starch based Thermoset Resins, e.g., potato or corn or proteins such as soy. The cross-linking or the esterification reaction proceeds faster and at lower temperature in the presence of a suitable catalyst. Sodium hypophosphite (SHP), a widely used catalyst for esterification using poly(carboxylic acid)s and hydroxyl groups of starch or cellulose, contains phosphorus and the effluents containing SHP, i.e., phosphorus, are toxic to humans and can adversely affect the fauna in water. Also, SHP decomposes to toxic phosphine gas when heated. The results of t...
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Nonedible Starch Based “Green” Thermoset Resin Obtained via Esterification Using a Green Catalyst
2016Co-Authors: Namrata V. Patil, Anil N NetravaliAbstract:In this study, a biobased Thermoset Resin was developed from a nonedible starch source obtained from mango processing industrial waste. Mango seed starch (MSS) was extracted from defatted mango seed kernels and cross-linked using a “green” cross-linker/catalyst system, 1,2,3,4-butane tetracarboxylic acid (BTCA)/sodium propionate (NaP), to obtain the Thermoset Resin. The tensile properties of the cross-linked MSS were found to be adequate to replace edible starch based Thermoset Resins, e.g., potato or corn or proteins such as soy. The cross-linking or the esterification reaction proceeds faster and at lower temperature in the presence of a suitable catalyst. Sodium hypophosphite (SHP), a widely used catalyst for esterification using poly(carboxylic acid)s and hydroxyl groups of starch or cellulose, contains phosphorus and the effluents containing SHP, i.e., phosphorus, are toxic to humans and can adversely affect the fauna in water. Also, SHP decomposes to toxic phosphine gas when heated. The results of the present study indicate that sodium propionate (NaP), used as a nonphosphorus green catalyst, is as effective and efficient as SHP. The cross-linking of starch was confirmed directly using ATR-FTIR spectra and the degree of substitution (DS) values obtained by chemical titrations as well as indirectly through an increase in the tensile properties. Higher modulus and strength and lower degree of swelling in water of films cross-linked using NaP confirmed that NaP acts as a better catalyst than the conventional SHP
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a soy flour based Thermoset Resin without the use of any external crosslinker
Green Chemistry, 2013Co-Authors: Trina Ghosh Dastidar, Anil N NetravaliAbstract:In the current research a novel water based reaction scheme was developed to crosslink the protein from soy flour (SF) without using any external crosslinker. Soy flour, which contains about 55% protein and 32% carbohydrate and is the least expensive commercially available soy protein variety, was used for this research. Sugars and protein from SF were separated using a simple lab based filtration technique. The sugars were then oxidized using H2O2, a benign oxidizing agent, to obtain aldehyde and carboxyl groups. The oxidized sugars containing these groups were then used to crosslink the reactive groups present in the protein separated from SF, mainly utilizing Maillard type chemistry. The resulting crosslinked (Thermosetting) soy protein Resin had enhanced mechanical and thermal properties and reduced moisture absorption. When reinforced with strong microfibrillated cellulose they can produce fully sustainable and biodegradable green composites. The novel scheme developed here may be extended to prepare biobased plastics with enhanced properties by crosslinking natural flours with similar composition (soluble sugars and protein).
Saïd Seghar - One of the best experts on this subject based on the ideXlab platform.
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Recycling of waste tire rubber: Microwave devulcanization and incorporation in a Thermoset Resin
Waste Management, 2017Co-Authors: Karima Aoudia, Saïd Azem, Nourredine Aït Hocine, V. Pettarin, Michelolivier Gratton, Saïd SegharAbstract:This study focused on the possibility of recycling Waste Tire Rubber (WTR) to be used as polymer modifier. Thus, WTR was grinded into powder, at ambient temperature, with a disc mill PQ500 and microwave electromagnetic energy was used to devulcanize this powder with the final aim of producing a new composite by its incorporation in a Thermoset Resin. The influence of the treatment microwave energy on the devulcanization ratio was investigated. FTIR analysis revealed that rupture of Sulfur-Sulfur (S–S) and Carbon-Sulfur (C–S) bonds have occurred during the treatment. Swelling analysis showed that the microwave treatment can lead to a very significant degree of devulcanization. The Ground Tire Rubber (GTR) and the Devulcanized Ground Tire Rubber (DGTR) were then separately used to prepare epoxy based composites. It appeared that epoxy composites filled with DGTR have better mechanical properties than those filled with untreated GTR. This result agrees with scanning electron microscopy observations which highlighted a better interface coherence between DGTR and epoxy. A complementary analysis pointed out a linear relationship between the rubber modulus and the number of crosslink per chain.
Mikael Skrifvars - One of the best experts on this subject based on the ideXlab platform.
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Impact and flexural properties of flax fabrics and Lyocell Fiber reinforced bio-based Thermoset for automotive and structural applications
2015Co-Authors: Kayode Adekunle, Sungwoo Cho, Christian Patzelt, Thomas O. J. Blomfeldt, Mikael SkrifvarsAbstract:A bio-based Thermoset Resin was reinforced with flax fabrics and Lyocell fiber. The effect of different weave architecture was studied with four flax fabrics with different architecture: plain, twill (two different types) and dobby. The effect of the outer ply thickness was studied and characterized with flexural and impact testing. Composites manufactured with plain weave reinforcement had the best mechanical properties. The tensile strength, tensile modulus, flexural strength, flexural modulus and impact strength was 280 MPa, 32 GPa, 250 MPa, 25 GPa and 75 kJ/m2 respectively.
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Morphological and mechanical properties of a biobased composite from a lactic acid based Thermoset Resin and viscose fiber reinforcement
2014Co-Authors: Fatimat Oluwatoyin Bakare, Mikael Skrifvars, Yanfei Wang, Shahrzad Javanshir Afshar, Nima Esmaeli, Dan ÅkessonAbstract:Morphological and mechanical properties of a biobased composite from a lactic acid based Thermoset Resin and viscose fiber reinforcement
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Synthesis and Preparation of Biobased Composites with A Novel Thermoset Resin from Lactic Acid
2014Co-Authors: Fatimat Oluwatoyin Bakare, Mikael Skrifvars, Yanfei Wang, Shahrzad Javanshir Afshar, Nima Esmaeli, Dan ÅkessonAbstract:Synthesis and Preparation of Biobased Composites with A Novel Thermoset Resin from Lactic Acid
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Biobased Composites Prepared From a Lactic Acid Based Thermoset Resin and Natural-Fiber Reinforcement
2013Co-Authors: Fatimat Oluwatoyin Bakare, Yanfei Wang, Shahrzad Javanshir Afshar, Dan Åkesson, Nima Esmaeili, Mikael SkrifvarsAbstract:Biobased Composites Prepared From a Lactic Acid Based Thermoset Resin and Natural-Fiber Reinforcement
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Jute fiber reinforced methacrylated soy bean oil based Thermoset composites prepared by vacuum injection molding technique
Journal of Biobased Materials and Bioenergy, 2012Co-Authors: K. Adekunle, Sungwoo Cho, R. Ghoreishi, M. Ehsani, Mikael SkrifvarsAbstract:Bio-based composites based on soybean oil Thermoset Resin were manufactured with vacuum injection molding technique. Methacrylated soybean oil (MMSO) was processed with vacuum injection molding tec ...
Pierre Beauchêne - One of the best experts on this subject based on the ideXlab platform.
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thermoplastic Thermoset multilayer composites a way to improve the impact damage tolerance of Thermosetting Resin matrix composites
Composite Structures, 2017Co-Authors: Camille Sonnenfeld, Philippe Nunez, Romain Agogué, Hakima Mendiljakani, Pierre BeauchêneAbstract:We present a method to improve the impact damage tolerance of Thermoset Resin matrix composites by exploiting thermoplastic material impact resistance properties. Two configurations of thermoplastic/Thermoset multilayer composites are considered: (a) thermoplastic material is used on sample surface as shock absorber and (b) thermoplastic film is inserted in between Thermoset layers to act as interlayer. We aim at increasing adhesion strength between thermoplastic and Thermoset Resin matrix. We show that mode I critical strain energy release rate, determined by the wedge double cantilever beam fracture test, increases significantly when a third amorphous polymer interlayer compatible with both thermoplastic and Thermoset Resin is inserted. The analysis of scanning electron microscope fracture surfaces helps us to clarify the adhesion mechanism involved. The high adhesion between thermoplastic and Thermoset Resins obtained with this method, together with the ability of thermoplastics to dissipate the impact damage in the first plies ensure the reliability of this stacked configuration. Finally, we show that these multilayer composite significantly increases the impact resistance of composite materials.
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Thermoplastic/Thermoset multilayer composites: A way to improve the impact damage tolerance of Thermosetting Resin matrix composites
Composite Structures, 2017Co-Authors: Camille Sonnenfeld, Hakima Mendil-jakani, Philippe Nunez, Romain Agogué, Pierre BeauchêneAbstract:We present a method to improve the impact damage tolerance of Thermoset Resin matrix composites by exploiting thermoplastic material impact resistance properties. Two configurations of thermoplastic/Thermoset multilayer composites are considered: (a) thermoplastic material is used on sample surface as shock absorber and (b) thermoplastic film is inserted in between Thermoset layers to act as interlayer. We aim at increasing adhesion strength between thermoplastic and Thermoset Resin matrix. We show that mode I critical strain energy release rate, determined by the wedge double cantilever beam fracture test, increases significantly when a third amorphous polymer interlayer compatible with both thermoplastic and Thermoset Resin is inserted. The analysis of scanning electron microscope fracture surfaces helps us to clarify the adhesion mechanism involved. The high adhesion between thermoplastic and Thermoset Resins obtained with this method, together with the ability of thermoplastics to dissipate the impact damage in the first plies ensure the reliability of this stacked configuration. Finally, we show that these multilayer composite significantly increases the impact resistance of composite materials.
Dan Åkesson - One of the best experts on this subject based on the ideXlab platform.
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Morphological and mechanical properties of a biobased composite from a lactic acid based Thermoset Resin and viscose fiber reinforcement
2014Co-Authors: Fatimat Oluwatoyin Bakare, Mikael Skrifvars, Yanfei Wang, Shahrzad Javanshir Afshar, Nima Esmaeli, Dan ÅkessonAbstract:Morphological and mechanical properties of a biobased composite from a lactic acid based Thermoset Resin and viscose fiber reinforcement
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Synthesis and Preparation of Biobased Composites with A Novel Thermoset Resin from Lactic Acid
2014Co-Authors: Fatimat Oluwatoyin Bakare, Mikael Skrifvars, Yanfei Wang, Shahrzad Javanshir Afshar, Nima Esmaeli, Dan ÅkessonAbstract:Synthesis and Preparation of Biobased Composites with A Novel Thermoset Resin from Lactic Acid
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Biobased Composites Prepared From a Lactic Acid Based Thermoset Resin and Natural-Fiber Reinforcement
2013Co-Authors: Fatimat Oluwatoyin Bakare, Yanfei Wang, Shahrzad Javanshir Afshar, Dan Åkesson, Nima Esmaeili, Mikael SkrifvarsAbstract:Biobased Composites Prepared From a Lactic Acid Based Thermoset Resin and Natural-Fiber Reinforcement
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Thermoset lactic acid based Resin as a matrix for flax fibers
Journal of Applied Polymer Science, 2011Co-Authors: Dan Åkesson, Mikael Skrifvars, Jukka Seppälä, Minna TurunenAbstract:Abstract Thermoset composites were produced from flax fibers and a novel lactic acid (LA)-based Thermoset Resin. This Resin is based on methacrylated, star-shaped oligomers of LA. The main purpose ...
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Preparation and characterization of bio-nanocomposites from biobased Thermoset Resin, montmorillonite and natural fiber
2011Co-Authors: Samaneh Rahimiashtiyani, Mikael Skrifvars, Dan ÅkessonAbstract:In this study bio-nanocomposites were manufactured, using a Thermoset Resin based on lactic acid and nanoclay (montmorillonite) as a matrix for flax fibers. The obtained composites were characteriz ...
