Interpenetrating polymer network composites of polypyrrole and poly (methyl acrylate) or poly (styrene-co-butyl acrylate) with low percolation thresholds

Interpenetrating polymer network composites of polypyrrole with poly and poly(styrene-co-butyl acrylate) were prepared using FeCl3-impregnated matrix polymer films and dipping them into a solution of pyrrole in water using a pyrrole concentration of 67 mmol/dm3 and above

Tarun Kumar Mandai; Broja M. Mandai

2002

Scholarcy highlights

  • Interpenetrating polymer network composites of polypyrrole with poly and poly(styrene-co-butyl acrylate) were prepared using FeCl3-impregnated matrix polymer films and dipping them into a solution of pyrrole in water using a pyrrole concentration of 67 mmol/dm3 and above
  • No polymerization occurs in solution outside the films
  • Polymerization occurs rapidly, about 90% of pyrrole being polymerized in the first hour inside the films
  • Not all of the matrix polymer can be extracted out of the composites by solvent extraction. This indicates that grafting of PPy is taking place on some of the molecules of the matrix polymers
  • Differential scanning calorimetry reveals that PPy and SBA are immiscible while a 13 °C shift in Tg of PMA is noticed in the PPy /PMA composites which might be attributed to grafting of PPy into PMA
  • The control experiment shows that FeCl3-impregnated films swell to a great extent on immersion in water due to the osmotic entry of the latter into the films
  • As regards the stability with temperature, the conductivity in air increases with temperature until about 80 °C and some drop occurs up to the investigated temperature of 100 °C

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