Electro-responsive Polythiophene/Carboxymethyl Cellulose Smart Hydrogels

Nanticha Danmatam, Datchanee Pattavarakorn


In this study, the conductive polythiophene/carboxymethyl cellulose (PTh/CMC) hydrogels were prepared. Polythiophene (PTh) was synthesized via chemical oxidative polymerization method by using ferric chloride (FeCl3) as oxidizer.  Monomer to oxidizer ratio and reaction time on electrical conductivity of PTh were investigated. The results showed that highest electrical conductivity (247.4432 ± 0.3569 S/cm) of PTh was found at the monomer to oxidizer ratio equal to 1:1 and reaction time was 24 hr. The effect of CMC concentration was also studied in order to obtain better hydrogel matrix properties. It was found that hydrogel prepared from 20 %wt CMC solution and crosslinked with citric acid  had proper swelling ratio and highest tensile strength. PTh/CMC composite hydrogels were then prepared, conductive PTh particles was added in CMC solution and hydrogels were casted and crosslinked in citric acid solution. The electro-responsive properties, bending response, of the PTh/CMC composite hydrogel under DC electric field was finally examined.

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