The Experts below are selected from a list of 72 Experts worldwide ranked by ideXlab platform
Roger Wardman - One of the best experts on this subject based on the ideXlab platform.
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Fibres from polypropylene and liquid crystal polymer blends: 3. A comparison of polyblend Fibres containing Vectra A900, Vectra B950 and Rodrun LC3000
Polymer, 1993Co-Authors: Y Qin, D L Brydon, Robert Rhodes Mather, Roger WardmanAbstract:Abstract Polyblend Fibres were made of polypropylene (PP) and three thermotropic liquid crystal polymers (LCPs). The LCPs were found to exist in different morphological structures; the Vectra A900 and Vectra B950 LCPs existed mainly as fibrils, while the Rodrun LC3000 existed as short elongated ribbons. The tensile properties of the as-spun Fibres were improved on addition of the LCPs, with the properties of the drawn polyblend Fibres varying with the drawing procedure. In one-stage drawing, the polyblend Fibres gave poorer tensile properties than the pure PP Fibre. However in two-stage drawing, the Vectra A900 blend showed an increase in initial modulus over that of the pure PP Fibre, while the Rodrun LC3000 blend produced an improvement in Fibre Tenacity.
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Fibres from polypropylene and liquid crystal polymer blends: 2. Effect of extrusion and drawing conditions
Polymer, 1993Co-Authors: Y Qin, D L Brydon, Robert Rhodes Mather, Roger WardmanAbstract:Abstract The drawing conditions were studied for a polyblend Fibre of polypropylene (PP) and a thermotropic liquid crystal polymer (LCP). It was found that, in one-stage drawing, the LCP fibrils were split into short fragments with aspect ratios of around 10. Although Fibre properties were improved with the increase in drawing temperature, the best properties of the polyblend Fibre from one-stage drawing were poorer than those of the pure polypropylene Fibre. A two-stage drawing process was studied in terms of the ratios and temperatures of the first- and second-stage drawings. It was found that the Fibre properties were strongly affected by these parameters. At best, the Fibre Tenacity and initial modulus in the two-stage drawing were 14% and 39% higher than the highest values from the one-stage drawing. The LCP fibrils were found to split to a much lower extent in the two-stage drawing. The optimum drawing proceedure was applied to a series of polyblend Fibres extruded under various extrusion rates and with a number of draw-down ratios.
Y Qin - One of the best experts on this subject based on the ideXlab platform.
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Fibres from polypropylene and liquid crystal polymer blends: 3. A comparison of polyblend Fibres containing Vectra A900, Vectra B950 and Rodrun LC3000
Polymer, 1993Co-Authors: Y Qin, D L Brydon, Robert Rhodes Mather, Roger WardmanAbstract:Abstract Polyblend Fibres were made of polypropylene (PP) and three thermotropic liquid crystal polymers (LCPs). The LCPs were found to exist in different morphological structures; the Vectra A900 and Vectra B950 LCPs existed mainly as fibrils, while the Rodrun LC3000 existed as short elongated ribbons. The tensile properties of the as-spun Fibres were improved on addition of the LCPs, with the properties of the drawn polyblend Fibres varying with the drawing procedure. In one-stage drawing, the polyblend Fibres gave poorer tensile properties than the pure PP Fibre. However in two-stage drawing, the Vectra A900 blend showed an increase in initial modulus over that of the pure PP Fibre, while the Rodrun LC3000 blend produced an improvement in Fibre Tenacity.
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Fibres from polypropylene and liquid crystal polymer blends: 2. Effect of extrusion and drawing conditions
Polymer, 1993Co-Authors: Y Qin, D L Brydon, Robert Rhodes Mather, Roger WardmanAbstract:Abstract The drawing conditions were studied for a polyblend Fibre of polypropylene (PP) and a thermotropic liquid crystal polymer (LCP). It was found that, in one-stage drawing, the LCP fibrils were split into short fragments with aspect ratios of around 10. Although Fibre properties were improved with the increase in drawing temperature, the best properties of the polyblend Fibre from one-stage drawing were poorer than those of the pure polypropylene Fibre. A two-stage drawing process was studied in terms of the ratios and temperatures of the first- and second-stage drawings. It was found that the Fibre properties were strongly affected by these parameters. At best, the Fibre Tenacity and initial modulus in the two-stage drawing were 14% and 39% higher than the highest values from the one-stage drawing. The LCP fibrils were found to split to a much lower extent in the two-stage drawing. The optimum drawing proceedure was applied to a series of polyblend Fibres extruded under various extrusion rates and with a number of draw-down ratios.
Mizi Fan - One of the best experts on this subject based on the ideXlab platform.
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The influence of pre-treatment of Spartium junceum L. Fibres on the structure and mechanical properties of PLA biocomposites
Arabian Journal of Chemistry, 2019Co-Authors: Zorana Kovačević, Sandra Bischof, Edita Vujasinović, Mizi FanAbstract: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.
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The influence of pre-treatment of Spartium junceum L. Fibres on the structure and mechanical properties of PLA biocomposites
Elsevier, 2019Co-Authors: Zorana Kovačević, Sandra Bischof, Edita Vujasinović, Mizi FanAbstract: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
Robert Rhodes Mather - One of the best experts on this subject based on the ideXlab platform.
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Fibres from polypropylene and liquid crystal polymer blends: 3. A comparison of polyblend Fibres containing Vectra A900, Vectra B950 and Rodrun LC3000
Polymer, 1993Co-Authors: Y Qin, D L Brydon, Robert Rhodes Mather, Roger WardmanAbstract:Abstract Polyblend Fibres were made of polypropylene (PP) and three thermotropic liquid crystal polymers (LCPs). The LCPs were found to exist in different morphological structures; the Vectra A900 and Vectra B950 LCPs existed mainly as fibrils, while the Rodrun LC3000 existed as short elongated ribbons. The tensile properties of the as-spun Fibres were improved on addition of the LCPs, with the properties of the drawn polyblend Fibres varying with the drawing procedure. In one-stage drawing, the polyblend Fibres gave poorer tensile properties than the pure PP Fibre. However in two-stage drawing, the Vectra A900 blend showed an increase in initial modulus over that of the pure PP Fibre, while the Rodrun LC3000 blend produced an improvement in Fibre Tenacity.
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Fibres from polypropylene and liquid crystal polymer blends: 2. Effect of extrusion and drawing conditions
Polymer, 1993Co-Authors: Y Qin, D L Brydon, Robert Rhodes Mather, Roger WardmanAbstract:Abstract The drawing conditions were studied for a polyblend Fibre of polypropylene (PP) and a thermotropic liquid crystal polymer (LCP). It was found that, in one-stage drawing, the LCP fibrils were split into short fragments with aspect ratios of around 10. Although Fibre properties were improved with the increase in drawing temperature, the best properties of the polyblend Fibre from one-stage drawing were poorer than those of the pure polypropylene Fibre. A two-stage drawing process was studied in terms of the ratios and temperatures of the first- and second-stage drawings. It was found that the Fibre properties were strongly affected by these parameters. At best, the Fibre Tenacity and initial modulus in the two-stage drawing were 14% and 39% higher than the highest values from the one-stage drawing. The LCP fibrils were found to split to a much lower extent in the two-stage drawing. The optimum drawing proceedure was applied to a series of polyblend Fibres extruded under various extrusion rates and with a number of draw-down ratios.
D L Brydon - One of the best experts on this subject based on the ideXlab platform.
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Fibres from polypropylene and liquid crystal polymer blends: 3. A comparison of polyblend Fibres containing Vectra A900, Vectra B950 and Rodrun LC3000
Polymer, 1993Co-Authors: Y Qin, D L Brydon, Robert Rhodes Mather, Roger WardmanAbstract:Abstract Polyblend Fibres were made of polypropylene (PP) and three thermotropic liquid crystal polymers (LCPs). The LCPs were found to exist in different morphological structures; the Vectra A900 and Vectra B950 LCPs existed mainly as fibrils, while the Rodrun LC3000 existed as short elongated ribbons. The tensile properties of the as-spun Fibres were improved on addition of the LCPs, with the properties of the drawn polyblend Fibres varying with the drawing procedure. In one-stage drawing, the polyblend Fibres gave poorer tensile properties than the pure PP Fibre. However in two-stage drawing, the Vectra A900 blend showed an increase in initial modulus over that of the pure PP Fibre, while the Rodrun LC3000 blend produced an improvement in Fibre Tenacity.
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Fibres from polypropylene and liquid crystal polymer blends: 2. Effect of extrusion and drawing conditions
Polymer, 1993Co-Authors: Y Qin, D L Brydon, Robert Rhodes Mather, Roger WardmanAbstract:Abstract The drawing conditions were studied for a polyblend Fibre of polypropylene (PP) and a thermotropic liquid crystal polymer (LCP). It was found that, in one-stage drawing, the LCP fibrils were split into short fragments with aspect ratios of around 10. Although Fibre properties were improved with the increase in drawing temperature, the best properties of the polyblend Fibre from one-stage drawing were poorer than those of the pure polypropylene Fibre. A two-stage drawing process was studied in terms of the ratios and temperatures of the first- and second-stage drawings. It was found that the Fibre properties were strongly affected by these parameters. At best, the Fibre Tenacity and initial modulus in the two-stage drawing were 14% and 39% higher than the highest values from the one-stage drawing. The LCP fibrils were found to split to a much lower extent in the two-stage drawing. The optimum drawing proceedure was applied to a series of polyblend Fibres extruded under various extrusion rates and with a number of draw-down ratios.