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RISS 인기검색어
- 검색키워드
- 저자 : Cédric Cochrane (검색결과 3 건)
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Effect of Water and Chemical Stresses on the Silver Coated Polyamide Yarns
Ezgi Ismar,Shahood uz Zaman,Xuyuan Tao,Cédric Cochrane,Vladan Koncar 한국섬유공학회 2019 Fibers and polymers Vol.20 No.12
E-textiles; new emerging hybrid systems and devices require novel standards regarding their reliability anddurability in order to gain the attraction and satisfaction for the customers and market readiness. Launderability of e-textiles isone of the key problems for their reliability and maintenance. Standards should fulfill the requirements for both: the textileand electronic parts of e-textile products. In this article, an analysis of water and detergent influence on the conductive yarnswhich are generally used as a connection in e-textile products is investigated. During the washing process various stresses(mechanical, temperature, chemical, etc.) damage the connection elements such as electrically yarns that make all together atextile circuit board (textile motherboard). All those stresses are moreover interdependent. Water or chemical stresses aresupposed to be strongly damaging and should be discussed in details. During the washing procedure it is important tounderstand the water and detergent effects on the conductive yarns. Therefore, experimental studies are conducted by dippingconductive yarns in those solutions and by extended characterization. Structural changes of yarns are tested by FTIR-ATR,and peaks before and after dipping in the solutions were noted. Results point out the level of damage on the yarn surfacecaused by chemical stresses due to dipping in solutions. Furthermore, yarn surfaces were analyzed with optical microscopy. Remaining solutions after removing the dipped yarn were also analyzed by UV-Visible Spectroscopy to check any possibleremoval of silver coating from the yarn into solution, due to water or water detergent solutions. UV-Visible Spectroscopyvalidated our results obtained by FTIR-ATR peaks. By these experiments, time duration e-textiles can withstand in liquidsolution without any loss of conductivity can be evaluated and predicted.
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Local Electrical Characterization of PVDF Textile Filament
Anthony Ferri,François Rault,Antonio Da Costa,Cédric Cochrane,Matthieu Boudriaux,Guillaume Lemort,Christine Campagne,Eric Devaux,Christian Courtois,Rachel Desfeux 한국섬유공학회 2019 Fibers and polymers Vol.20 No.7
The piezoelectric behavior of poly(vinylidene fluoride), PVDF, has been known for several decades and is clearlyrelated to its crystalline phases. Many works made on films or fibers have focused on the characterization of the phasetransitions during various PVDF processing and on its electromechanical activity by combining several techniques. Piezoforcemicroscopy (PFM) is an interesting tool to underline the crystalline forms and piezoelectricity efficiency of PVDF atthe local scale. However, this technique is little used on samples in the form of fibers and in this case, it is most oftennanofibers. In this work, two conventional PVDF textile filaments, with different weak draw ratio, are produced and analyzedby FTIR, XRD, and PFM. We demonstrate that the PFM analysis can be relevant for specimens presenting low signals duringother characterizations. Therefore, the local piezo-/ferroelectricity into the fiber is highlighted underlining the existence of thepolar phases of PVDF. Then, the effective piezoelectric coefficient d33 of PVDF fiber drawn with a ratio of 1.5 is estimated at12 pm/V.
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Shahood uz Zaman,Xuyuan Tao,Cédric Cochrane,Vladan Koncar 한국섬유공학회 2019 Fibers and polymers Vol.20 No.11
E-textile is one of the emerging fields of current era and some dynamic and state of the art products are alreadyavailable on the market. E-textile products are facing problems related to reliability and difficulty in laundering. This paper isfocused on the standards to be proposed for washability of e-textile structures after in depth analysis of wash process. Mechanical forces acting on the e-textile structure during washing are considered the most damaging among all others. Wellknown textile benchmark tests such as Martindale abrasion and pilling box are supposed to have similar mechanical damageson e-textile structures as in washing. As E-textiles relay on flexible connections (textile motherboard) within textile structurerealized by conductive yarns, they are the main target of our investigations. The resultant change in electrical resistance aftermechanical tests on silver plated conductive yarns used as connection threads in e-textile structures is co-related withwashing results to propose equivalent damage effect without washing of samples.
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