PPy-coated Lycra

FIGURE 1.18 Resistance change during stretching of PPy-coated Lycra (graph courtesy of T. Campbell). 

Results show that electrical conductivity is dependent to reaction time. The electrical conductivity of the PPy coated Lycra/Polyester fabrics varies from 5x 10 S/cm (after 1 hr) to 5 x lO S/cm (after 3 hr) and then decrease to 1.5 x S/cm (after 6 hr). 

In the present work, an attempt has been made to study on the effect of reaction time in chemical oxidation polymerization of pyrrole monomer on the electric performance of PPy coated Lycra olyester fabric pretieated. 

Electrically conducting fibres can be used directly to measure strain. It is reported that PPy-coated Lycra compares well with sensitive strain gauge materials and inorganic thermistors (Cho, 2010). Mattmann et al. (2008) report a sensor thread made from a thermoplastic elastomer doped with 50% by weight of carbon black. 

FIGURE 11.9 Cyclic voltammogram of Ppy- NDSA-coated Nylon Lycra in 1.0 M NaN03 at a scan rate of 100 mV s. The PPy coated Nylon Lycra was prepared using the in situ method for 2 h in an aqueous solution containing 0.015 M pyrrole, 0.04 M FeCh, and 0.005 M NDSA. (Courtesy Dr Jian Wu PhD diss.. University of Wollongong, 2005.)... 

FIGURE 2 Electrical conductivity of Lycra/Polyester PPy coated fabrics pretreated, prepared with different polymerization reaction times. 

FIGURE 11.20 Electrical resistance versus strain response over 1, 2, and 3 Hz frequencies of Nylon Lycra, coated with PPy-NDSA. 

The Lycra/Polyester fabric coated PPy so prepared exhibit a suitable value of conductivity equal to 5 x S/cm and are expected to find vast potential of application. 

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