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Kale K.H.,Bombay Textile Research Association | Palaskar S.S.,Bombay Textile Research Association
Journal of the Textile Institute | Year: 2012

Plasma-enhanced chemical vapour deposition of two monomers, namely tetraethylorthosilicate (TEOS) and hexamethyldisiloxane (HMDSO) was carried out on nylon 66 fabrics. Pulsed discharge at variable duty cycle was used for analysing the effect of different pulse parameters on the structural properties of plasma polymers. HMDSO plasma yielded more hydrophobic surfaces than TEOS plasma. The surface chemical composition of plasma-treated fabrics was investigated by Fourier transform infra-red spectroscopy. Both duty cycle and treatment time were found to play a substantial role in determining the structural properties of plasma polymers. Organic content, of HMDSO plasma polymers (pp-HMDSO) showed comparatively better retention of the original monomer groups at shorter treatment durations and at lower duty cycles. TEOS plasma polymers (pp-TEOS) obtained under pulsed discharge exhibited higher carbon content when compared to continuous wave (CW) plasma. The effect of pulsed discharge conditions on the tensile properties was also investigated. A slight but significant increase in the elastic modulus of nylon fabric was observed after treatment with the HMDSO plasma under CW discharge. The durability of plasma polymers to washing demonstrated that HMDSO is superior to TEOS for obtaining hydrophobic surface with good durability in nylon 66 fabrics. © 2012 Copyright The Textile Institute.

Patil A.J.,Bombay Textile Research Association | Deogaonkar S.C.,Bombay Textile Research Association
Melliand International | Year: 2012

The in-situ polymerization of polypyrrole (PPy) on PC blend fabrics was successfully carried out by a 2 step process. The surface resistivity of the samples was obtained in the range of 50-2500 Ω/square. The conductivity range is suitable for many technical textile applications. The SEM exhibited complete coating of fibers and inter-yarn spaces by the polymer. The durability studies revealed that the aqueous washing resulted in remarkable loss in conductivity. Whereas, dry cleaning was comparatively less severe as conductivity loss was relatively negligible. Further research needs to be focused on improvement of PPy coated textiles towards aqueous washing in order to expand its scope in application areas that demand durability.

Deogaonkar S.C.,Bombay Textile Research Association | Patil A.J.,Bombay Textile Research Association
Colourage | Year: 2012

The present work describes a novel approach for in-situ chemical polymerization of polyaniline on polyester fabric by a process similar to textile dyeing/finishing. The concentration of monomer was varied at three levels. The deposition of polyaniline was confirmed by the decreased electrical surface resistivity. The tensile strength of polyaniline/polyester composite fabric was not significantly affected by the deposition. The deposition of polyaniline was analyzed by FTIR-ATR analysis and SEM characterization.

Patil A.J.,Bombay Textile Research Association | Pandey A.K.,Bombay Textile Research Association
Indian Journal of Fibre and Textile Research | Year: 2012

The present paper reports a novel approach for in situ polymerization of polypyrrole on cotton fabric using conventional wet processing method, i.e. jigger machine which is primarily used for textile fabric dyeing. The addition of oxidant in the polymerization bath is controlled to obtain regular and linear polypyrrole polymer. Cotton fabrics (100%, plain weave) have been treated with pyrrole monomer at three concentrations and three durations of polymerization under low temperature conditions. The resultant polypyrrole coated cotton (PPy-CT) fabrics are characterized for electrical conductivity, morphology and fine structure. The surface resistivity in the range 15 - 5000 ohm/square is achieved on cotton fabrics. Naphthalene-2- sulfonic acid (NSA) as dopant is also studied to observe its effect on the reduction in surface resistivity and atmospheric ageing. The polymerization duration of 3 h is found to be optimum. The conductivity as well as atmospheric stability of NSA-doped PPy-CT fabrics is improved as compared to only Cl- ion dopants.

Deogaonkar S.C.,Bombay Textile Research Association | Bhat N.V.,Bombay Textile Research Association
Fibers and Polymers | Year: 2015

Chemically synthesized Intrinsically conductive Polymers (ICP’s), mainly Polypyrrole (PPy) and Polyaniline, coated cotton fabrics has been utilized as transducers in ammonia and ethanol sensing in broad range of concentrations. The response, in terms of decrease or increase in dc current on exposure to ammonia, ethanol and moisture is observed. It is found that, PPy coated fabric shows exactly opposite responses to each other when used for ammonia (decrease in current) and ethanol gas (increase in current) detection. Its response and recovery rate toward ethanol gas is higher as compared to ammonia gas. PANi coated fabric shows effective sensing towards ethanol vapor and less response towards ammonia sensing. The effect of variation in monomer concentrations and use of different sulphonic acid dopants on sensing mechanism of PPy and PANi coated cotton is studied towards one fixed concentration of ammonia and ethanol gas. Threshold concentration for ammonia and ethanol detection by PPy and PANi coated fabric is studied. Rate of change of conduction with time is analyzed for both PPy and PANi coated fabrics for deciding the selectivity of gas. © 2015, The Korean Fiber Society and Springer Science+Business Media Dordrecht.

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