The Experts below are selected from a list of 855 Experts worldwide ranked by ideXlab platform
Ton Peijs - One of the best experts on this subject based on the ideXlab platform.
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carbon nanotube polymer coatings for textile Yarns with good strain sensing capability
Sensors and Actuators A-physical, 2012Co-Authors: Rui Zhang, Renata Valenca, Emiliano Bilotti, Qiang Fu, Ton Peijs, Hua DengAbstract:Abstract In this study, a commercially available Spandex Multifilament Yarn was coated with a thermoplastic polyurethane/carbon nanotube (TPU/CNT) conductive polymer composite (CPC), and conductive elastic Yarns with good strain sensing ability were achieved with equivalent CNT concentrations as low as 0.015 wt.%. The resistance per meter coated Yarn decreased with increasing CNT concentration in the CPC coating, while in the case of a homogeneous coating, the CPC concentration in the coating solution did not have a significant effect on the resistance per meter coated Yarn. Upon cyclic loading, the strain sensing behaviour showed partial recovery of resistance in the first loading cycle, while good reversibility was observed a number of cycles, giving these materials good potential as sensors for smart textiles.
Eric Devaux - One of the best experts on this subject based on the ideXlab platform.
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electrical and mechanical properties of phenoxy multiwalled carbon nanotubes Multifilament Yarn processed by melt spinning
Textile Research Journal, 2012Co-Authors: Jonas Bouchard, Christine Campagne, Aurelie Cayla, Vincent Lutz, Eric DevauxAbstract:Nanocomposites based on Poly ((hydroxy ether) of bisphenol A) (Phenoxy) filled with multiwalled carbon nanotubes has been prepared by extrusion. Rheological behaviour and thermal degradation of the...
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Melt spun Multifilament Yarns of carbon nanotubes-based polymeric blends: Electrical, mechanical and thermal properties
Synthetic Metals, 2012Co-Authors: Aurelie Cayla, Christine Campagne, Maryline Rochery, Eric DevauxAbstract:Abstract The elaboration of a conductive synthetic Multifilament Yarn is usually carried out by the processing of a nanocomposite material where conductive nanofillers are incorporated in an insulating matrix. The use of a biphasic blend of immiscible polymers where one phase consists in a multiwalled carbon nanotubes (MWCNT)-polymer composite (selective localization in one polymer) reduces the amount of filler necessary to obtain the properties targeted, and decreases the difficulty to spin the material by a melt spinning process. MWCNT are good candidates for their incorporation in spinnable blends, due to their very high aspect ratio which permits to obtain electrical conductivity with low content without drastic modification of the blend viscosity. These nanofillers have been incorporated in polycaprolactone (PCL) by melt extrusion (4 wt.%), and the resultant nanocomposite has been spun with polypropylene (PP) in several proportions and with different draw ratios. At low concentrations of PCL + 4 wt.% MWCNT the conductive phase is dispersed, whereas with replacing up to 50 wt.% of PP by the conductive phase it gets continuous due to the development of a co-continuous structure. Relationships between morphology and electrical properties, mechanical and thermal properties have been established. A nanofilled PCL proportion of 50 wt.% in PP and a low draw ratio of 1.06 is necessary to obtain a co-continuous morphology and to create a conductive network by “double percolation” in the Multifilament Yarns. However, the Multifilament with such a composition (PP/PCL + 4% MWCNT 50/50) and draw ratio (E = 1.06), has low mechanical properties compared to neat PP Multifilament (without MWCNT). A compromise has then to be found in order to combine optimized electrical and mechanical properties of the Multifilaments. Concerning the thermal properties, the incorporation of nanofilled PCL and a modification of draw ratio shows a strong influence on crystallisation and thermal stability of the Multifilaments.
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Influence of fiber-like nanofillers on the rheological, mechanical, thermal and fire properties of polypropylene: An application to Multifilament Yarn
Composites Part A-applied Science and Manufacturing, 2010Co-Authors: Andrés F. Vargas, François Rault, Stéphane Giraud, Eric Devaux, Víctor H. Orozco, Betty L. LópezAbstract:Polypropylene and polypropylene grafted maleic anhydride based composites with modified and non-modified carbon nanotubes and sepiolite were prepared by melt extrusion. Their thermal, rheological, and dynamic mechanical properties were evaluated. Multifilament Yarns were obtained from the composites by spin-drawing process and their mechanical properties were measured. Knitted fabrics from the Multifilament Yarns were characterized by cone calorimetry. The best interaction was obtained for polypropylene/carbon nanotubes and polypropylene/polypropylene grafted maleic anhydride/sepiolite composites, as was confirmed by the increasing on the elastic modulus and thermal resistance. Nanofillers changed the thermal decomposition profiles compared to bare polypropylene. Knitted structures containing sepiolite decrease the maximum of heat release rate in comparison with unfilled samples.
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Polypropylene Multifilament Yarn filled with clay and/or graphite: Study of a potential synergy
Journal of Polymer Science Part B, 2010Co-Authors: François Rault, Christine Campagne, Maryline Rochery, Stéphane Giraud, Eric DevauxAbstract:In this study, clay and/or graphite particles have been added in various quantities to polypropylene matrix by melt blending. The morphology and more particularly the dispersion of particles in these composites have been compared by transmission electron microscopy (TEM). Their thermal stability has also been studied by thermogravimetric analysis (TGA). The experimental results reveal that the addition of 5 wt % of graphite particles or clay improves the thermal stability in air of the matrix by about 50 and 90 °C, respectively. In a second step, these blends have been melt-spun to produce Multifilament Yarns. The experiments have shown that the addition of graphite particles up to 5 wt % do not reduce the spinnability of the polypropylene, while the incorporation of more than 1 wt % of clay was causing difficulties for the spinning and more particularly for the drawing step. However, a slight improvement of the Young's modulus of the filaments reinforced with 1 wt % of Cloisite®15A is observed when the filaments are drawn up. The flammability of the different blends used as knitted fabrics has finally been evaluated with a mass loss calorimeter at 35 kW/m2. An atypical behavior has been highlighted for all blends and will be discussed. © 2010 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 48: 1185–1195, 2010
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polypropylene Multifilament Yarn filled with clay and or graphite study of a potential synergy
Journal of Polymer Science Part B, 2010Co-Authors: François Rault, Christine Campagne, Maryline Rochery, Stéphane Giraud, Eric DevauxAbstract:In this study, clay and/or graphite particles have been added in various quantities to polypropylene matrix by melt blending. The morphology and more particularly the dispersion of particles in these composites have been compared by transmission electron microscopy (TEM). Their thermal stability has also been studied by thermogravimetric analysis (TGA). The experimental results reveal that the addition of 5 wt % of graphite particles or clay improves the thermal stability in air of the matrix by about 50 and 90 °C, respectively. In a second step, these blends have been melt-spun to produce Multifilament Yarns. The experiments have shown that the addition of graphite particles up to 5 wt % do not reduce the spinnability of the polypropylene, while the incorporation of more than 1 wt % of clay was causing difficulties for the spinning and more particularly for the drawing step. However, a slight improvement of the Young's modulus of the filaments reinforced with 1 wt % of Cloisite®15A is observed when the filaments are drawn up. The flammability of the different blends used as knitted fabrics has finally been evaluated with a mass loss calorimeter at 35 kW/m2. An atypical behavior has been highlighted for all blends and will be discussed. © 2010 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 48: 1185–1195, 2010
Rui Zhang - One of the best experts on this subject based on the ideXlab platform.
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carbon nanotube polymer coatings for textile Yarns with good strain sensing capability
Sensors and Actuators A-physical, 2012Co-Authors: Rui Zhang, Renata Valenca, Emiliano Bilotti, Qiang Fu, Ton Peijs, Hua DengAbstract:Abstract In this study, a commercially available Spandex Multifilament Yarn was coated with a thermoplastic polyurethane/carbon nanotube (TPU/CNT) conductive polymer composite (CPC), and conductive elastic Yarns with good strain sensing ability were achieved with equivalent CNT concentrations as low as 0.015 wt.%. The resistance per meter coated Yarn decreased with increasing CNT concentration in the CPC coating, while in the case of a homogeneous coating, the CPC concentration in the coating solution did not have a significant effect on the resistance per meter coated Yarn. Upon cyclic loading, the strain sensing behaviour showed partial recovery of resistance in the first loading cycle, while good reversibility was observed a number of cycles, giving these materials good potential as sensors for smart textiles.
M. R. M. Mojtahedi - One of the best experts on this subject based on the ideXlab platform.
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olive hue visible near infrared camouflage properties of high speed melt spun poly ethylene terephthalate Multifilament Yarn
Dyes and Pigments, 2015Co-Authors: Mohammad Ali Tavanaie, Nima Esmaeilian, M. R. M. MojtahediAbstract:Abstract High speed melt spinning process was used to produce near infrared (NIR) camouflage poly(ethylene terephthalate) (PET) partially oriented Yarns (POY) against natural olive hue by using C.I. Pigment Green 7 (0.1% weight fraction), C.I. Pigment Yellow 184 (0.05% weight fraction) and carbon black (CB) (0.01% weight fraction). The effect of drawing, texturizing and knitting processes on the reflectance properties of produced sample was evaluated, and it was concluded that knitted fabric by texturized Yarns provides optimum simulation with natural olive hue. Also the effect of pigments and the process on the Yarns' structure by using the thermal and mechanical tests of Yarns was investigated. It was observed that the thermal and mechanical properties of all samples are in an acceptable range.
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Production and characterization of polypropylene fiber upon addition of selective peroxide during melt spinning and comparison with conventional polypropylene fibers
Journal of Applied Polymer Science, 2007Co-Authors: Bahareh Kalantari, Ruhollah Semnani Rahbar, M. R. M. Mojtahedi, S. A. Mousavi Shoushtari, Ali KhosroshahiAbstract:In the present work, effect of selective peroxide on reactor grade polypropylene (PP) (known as V30S) during melt spinning process on the physical and thermal properties of as-spun resultant Multifilament Yarn was studied. Attempts have also been made to compare this Yarn sample with other fiber samples produced from reactor and controlled rheology grades polypropylene. The results show that the Multifilament Yarn spun from V30S/Peroxide sample shows higher birefringence and tensile strength and also lower modulus, elongation at break, and shrinkage compared with that of spun from pure V30S granule. Density and thermal behavior studies show low variations compared with original sample. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007
Remigijus Ivanauskas - One of the best experts on this subject based on the ideXlab platform.
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Silver selenide modification of polyamide fabric
Central European Journal of Chemistry, 2013Co-Authors: Daiva Milašienė, Remigijus IvanauskasAbstract:Formation of a silver selenide layer on silicone coated polyamide cloth was investigated. Fabric samples were selenized in potassium selenotrithionate (K_2SeS_2O_6) solution then treated with AgNO_3 solution. Formation of a silver selenide particle layer on the surface was confirmed by a change in appearance, X-ray diffraction, and EDX analysis. XRD revealed two phases: orthorhombic naumannite (Ag_2Se) and monoclinic selenium (Se_8). SEM showed that the fabric macrostructure and the Multifilament Yarn microstructure was preserved. The silver selenide particles ranged from 100 nm to more than 20 µm.
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Silver selenide modification of polyamide fabric
Central European Journal of Chemistry, 2013Co-Authors: Daiva Milašienė, Remigijus IvanauskasAbstract:Formation of a silver selenide layer on silicone coated polyamide cloth was investigated. Fabric samples were selenized in potassium selenotrithionate (K2SeS2O6) solution then treated with AgNO3 solution. Formation of a silver selenide particle layer on the surface was confirmed by a change in appearance, X-ray diffraction, and EDX analysis. XRD revealed two phases: orthorhombic naumannite (Ag2Se) and monoclinic selenium (Se8). SEM showed that the fabric macrostructure and the Multifilament Yarn microstructure was preserved. The silver selenide particles ranged from 100 nm to more than 20 µm. Open image in new window