Resistance variation of conductive ink applied by the screen printing technique on different substrates / Pedro Gomes in COLORATION TECHNOLOGY, Vol. 136, N° 2 (04/2020)

[article]  inCOLORATION TECHNOLOGY > Vol. 136, N° 2 (04/2020) . - p. 130-136 Titre : Resistance variation of conductive ink applied by the screen printing technique on different substrates Type de document : texte imprimé Auteurs : Pedro Gomes, Auteur ; Derya Tama, Auteur ; Hélder Carvalho, Auteur ; Antonio Pedro Souto, Auteur Année de publication : 2020 Article en page(s) : p. 130-136 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Conducteurs organiques Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Encre Essais (technologie) Essais dynamiques Microscopie Polyamides Un polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine. Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères. Polyesters Résistance électrique Rigidité (mécanique) Sérigraphie Teinture -- Fibres textiles Textiles et tissus -- Lavage Index. décimale : 667.3 Teinture et impression des tissus Résumé : This research study focuses on the application of conductive ink by the screen printing technique to evaluate the potential of creating printed electrodes and to investigate the effect of washing upon electrical resistance and flexibility. Two conductive inks were applied by a conventional screen printing method on four different textile substrates, 100% cotton, 50%/50% cotton/polyester, 100% polyester and 100% polyamide. The inks were also applied on a multifibre fabric. Atmospheric plasma treatment was applied to improve the adhesion to the samples, and the resistance values were compared with those of non‐treated samples. The values were measured before and after cleaning and washing tests, which were performed to simulate domestic treatment for garments to predict the behaviour of the inks after normal usage of the fabrics. Comfort properties like stiffness of the fabrics were also evaluated after five and 10 washing cycles. It was observed that PE 825 ink forms a thicker film on the fabric surface, contributing to the loss of flexibility of the textile. However, PE 825 ink also produced the best results in terms of durability and lower values of resistance. Polyamide fabrics lost their conductive property after five washing cycles due to weak bonding between the ink and the fibres, whereas cotton fibres provided the best results. Note de contenu : - EXPERIMENTAL : Materials - Procedures - Analytical methods - RESULTS AND DISCUSSION : Stiffness test - Electrical resistance testing - Microscope analysis - Table 1 : Stiffness values - Table 2 : Resistance values of fabrics - Table 3 : Resistance values of multifibre fabrics DOI : https://doi.org/10.1111/cote.12451 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34232 [article]

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The influence of chemical reaction conditions upon poly(styrene-methyl methacrylate-crylic acid) synthesis : Variations in nanoparticle size, colour and deposition methods / Rui D. V. Fernandes in COLORATION TECHNOLOGY, Vol. 136, N° 2 (04/2020)

[article]  inCOLORATION TECHNOLOGY > Vol. 136, N° 2 (04/2020) . - p. 101-109 Titre : The influence of chemical reaction conditions upon poly(styrene-methyl methacrylate-crylic acid) synthesis : Variations in nanoparticle size, colour and deposition methods Type de document : texte imprimé Auteurs : Rui D. V. Fernandes, Auteur ; Pedro Gomes, Auteur ; Andrea Zille, Auteur ; Antonio Pedro Souto, Auteur Année de publication : 2020 Article en page(s) : p. 101-109 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie textile Copolymère styrène-méthacrylate de méthyle-acide crylique Copolymères -- Synthèse Latex Lumière -- Diffusion Polyamide 66 Polymérisation en émulsion Potentiel zeta Réactions chimiques Textiles et tissus Index. décimale : 667.3 Teinture et impression des tissus Résumé : Monodisperse latex nanospheres of poly(styrene-methyl methacrylate-acrylic acid) with different sizes were synthetised by soap-free emulsion copolymerisation and applied onto polyamide 6,6 fabrics by two methods, ie, gravitational sedimentation and dip-drawing. Different-sized nanospheres were synthetised by varying temperature and stirring velocity as reaction parameters. Scanning electron microscopy and scanning transmission electron microscopy were used to evaluate nanosphere sizes and deposition structures. The results showed two different nanosphere structural arrangements on the fabric surface, a hexagonal packed centre structure in the even surfaces and a square arrangement in the out-of-plane surfaces. Different colours were observed according to particle size, namely, violet (ca . 170 nm), blue (ca . 190 nm), green (ca . 210 nm), yellow (ca . 230 nm) and red (ca . 250 nm). An iridescence effect was also observed, displaying different colours at different observation angles. By controlling the size of the nanospheres it was possible to obtain different, brilliant and iridescent colours. Using different nanosphere sizes it was possible to obtain different interplanar distances and to control the light scattering in the crystalline lattice planes, obtaining Bragg diffraction patterns. Note de contenu : - Materials - Preparation of monodisperse P(St-MMA-AA) composite nanospheres - Fourier Transform-infrared spectroscopy with attenuated total reflectance - Dynamic light scattering and zeta potential measurements - Deposition of PCs by the dip-drawing method - Scanning electron microscopy and scanning transmission microscopy - Optical microscopy - Diffuse reflectance spectroscopy - Glossmeter analysis - Photographs DOI : https://doi.org/10.1111/cote.12452 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34229 [article]

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