Patricia Krawczak | Institut Mines-Telecom (original) (raw)
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Papers by Patricia Krawczak
HAL (Le Centre pour la Communication Scientifique Directe), Mar 10, 2014
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HAL (Le Centre pour la Communication Scientifique Directe), Nov 20, 2014
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HAL (Le Centre pour la Communication Scientifique Directe), Sep 7, 2009
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HAL (Le Centre pour la Communication Scientifique Directe), Oct 3, 2007
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Polymers & Polymer Composites, Nov 1, 2010
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HAL (Le Centre pour la Communication Scientifique Directe), Jun 26, 2018
International audienceNatural fibre-filled composites are recently considered to be used in inter... more International audienceNatural fibre-filled composites are recently considered to be used in interior parts of vehicles because of their eco-friendly and mechanical performance [1-3]. However, they emit VOCs at all stages of their life cycle, such as compounding, injection-moulding and usage [4]. In the present study water-assisted extrusion compounding process has been used to reduce the VOC emission during the usage of injection-moulded parts. Flax and hemp fibres (20 wt.%) reinforced polypropylene composites were compounded in presence of maleic anhydride grafted polypropylene (PP-g-MA) as compatibilizer using twin screw extrusion, with and without water injection during extrusion. Then the compounds where injection-moulded into standard test specimen. Physical and mechanical properties such as morphological, fibre length, tensile and impact properties were characterized as well as the total volatile organic compounds (TVOCs) and odour emission using automotive standard D42 3109-C. Released TVOCs from the composite products were quantified by air sampling on adsorbent followed by thermal desorption and GC-MS analysis. The scanning electron microscopic observation indicated a good dispersion of fibres in the matrix with a low reduction in average length and aspect ratio of fibres. Mechanical properties of samples produced with water-assisted compounding showed slightly reduced modulus and strength compared to the samples prepared without water assistance. For both flax and hemp fibre-reinforced composites, TVOC emissions are reduced by 94% and 30% respectively with water-assisted extrusion. So, the water-assisted extrusion process has proved its effectiveness in reducing VOCs emissions without scarifying the mechanical properties
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Polymers & Polymer Composites, May 1, 2009
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Journal of Applied Polymer Science, 2012
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HAL (Le Centre pour la Communication Scientifique Directe), Jun 15, 2008
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HAL (Le Centre pour la Communication Scientifique Directe), Sep 27, 2006
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HAL (Le Centre pour la Communication Scientifique Directe), Oct 16, 2011
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The invention relates to a method for converting a polycondensed elastomeric thermoplastic polyme... more The invention relates to a method for converting a polycondensed elastomeric thermoplastic polymer, including a step of extruding the polycondensed elastomeric thermoplastic polymer in the presence of water. The polycondensed elastomeric thermoplastic polymer is in particular chosen from copolymer block amides, copolyethers or copolyester block urethanes, copolyether block esters and the mixtures thereof, and is preferably a copolyether block amid
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International audienc
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HAL (Le Centre pour la Communication Scientifique Directe), Sep 28, 2005
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HAL (Le Centre pour la Communication Scientifique Directe), 2017
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An inverse method for determining the in-plane effective thermal conductivity of porous thermopla... more An inverse method for determining the in-plane effective thermal conductivity of porous thermoplastics was implemented by coupling infrared thermography experiments and numerical simulation of heat transfer in straight fins having temperature-dependent convective heat transfer coefficient. The microstructure heterogeneity of extruded polyethylene foam, in which pores are filled with air with different levels of open and closed porosity, was taken into account. The obtained effective thermal conductivity values were compared with previous results obtained using a numerical solution based on periodic homogenization techniques (NSHT) and the transient plane source technique (TPS) to verify the accuracy of the proposed method. The results show that the suggested method is in good agreement with both NSHT and TPS. Moreover, it is also appropriate for structural materials such as unidirectional fiber-reinforced plastic composites, where heat transfer is very different according to the fib...
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HAL (Le Centre pour la Communication Scientifique Directe), Mar 10, 2014
International audienc
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HAL (Le Centre pour la Communication Scientifique Directe), Nov 20, 2014
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HAL (Le Centre pour la Communication Scientifique Directe), Sep 7, 2009
International audienc
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HAL (Le Centre pour la Communication Scientifique Directe), Oct 3, 2007
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Polymers & Polymer Composites, Nov 1, 2010
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HAL (Le Centre pour la Communication Scientifique Directe), Jun 26, 2018
International audienceNatural fibre-filled composites are recently considered to be used in inter... more International audienceNatural fibre-filled composites are recently considered to be used in interior parts of vehicles because of their eco-friendly and mechanical performance [1-3]. However, they emit VOCs at all stages of their life cycle, such as compounding, injection-moulding and usage [4]. In the present study water-assisted extrusion compounding process has been used to reduce the VOC emission during the usage of injection-moulded parts. Flax and hemp fibres (20 wt.%) reinforced polypropylene composites were compounded in presence of maleic anhydride grafted polypropylene (PP-g-MA) as compatibilizer using twin screw extrusion, with and without water injection during extrusion. Then the compounds where injection-moulded into standard test specimen. Physical and mechanical properties such as morphological, fibre length, tensile and impact properties were characterized as well as the total volatile organic compounds (TVOCs) and odour emission using automotive standard D42 3109-C. Released TVOCs from the composite products were quantified by air sampling on adsorbent followed by thermal desorption and GC-MS analysis. The scanning electron microscopic observation indicated a good dispersion of fibres in the matrix with a low reduction in average length and aspect ratio of fibres. Mechanical properties of samples produced with water-assisted compounding showed slightly reduced modulus and strength compared to the samples prepared without water assistance. For both flax and hemp fibre-reinforced composites, TVOC emissions are reduced by 94% and 30% respectively with water-assisted extrusion. So, the water-assisted extrusion process has proved its effectiveness in reducing VOCs emissions without scarifying the mechanical properties
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Polymers & Polymer Composites, May 1, 2009
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Journal of Applied Polymer Science, 2012
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HAL (Le Centre pour la Communication Scientifique Directe), Jun 15, 2008
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HAL (Le Centre pour la Communication Scientifique Directe), Sep 27, 2006
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HAL (Le Centre pour la Communication Scientifique Directe), Oct 16, 2011
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The invention relates to a method for converting a polycondensed elastomeric thermoplastic polyme... more The invention relates to a method for converting a polycondensed elastomeric thermoplastic polymer, including a step of extruding the polycondensed elastomeric thermoplastic polymer in the presence of water. The polycondensed elastomeric thermoplastic polymer is in particular chosen from copolymer block amides, copolyethers or copolyester block urethanes, copolyether block esters and the mixtures thereof, and is preferably a copolyether block amid
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International audienc
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International audienc
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International audienc
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International audienc
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HAL (Le Centre pour la Communication Scientifique Directe), Sep 28, 2005
International audienc
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HAL (Le Centre pour la Communication Scientifique Directe), 2017
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International audienc
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An inverse method for determining the in-plane effective thermal conductivity of porous thermopla... more An inverse method for determining the in-plane effective thermal conductivity of porous thermoplastics was implemented by coupling infrared thermography experiments and numerical simulation of heat transfer in straight fins having temperature-dependent convective heat transfer coefficient. The microstructure heterogeneity of extruded polyethylene foam, in which pores are filled with air with different levels of open and closed porosity, was taken into account. The obtained effective thermal conductivity values were compared with previous results obtained using a numerical solution based on periodic homogenization techniques (NSHT) and the transient plane source technique (TPS) to verify the accuracy of the proposed method. The results show that the suggested method is in good agreement with both NSHT and TPS. Moreover, it is also appropriate for structural materials such as unidirectional fiber-reinforced plastic composites, where heat transfer is very different according to the fib...
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Handbook of Bioplastics and Biocomposites Engineering Applications, 2011
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