Polyene films prepared by poly (ethylene glycol)s-catalyzed dehydrochlorination of poly(vinyl chloride) : chemical and electrochemical properties

摘要

Poly(vinyl chloride) (PVC) film containing certainamounts of poly(ethylene glycol)s (PEG) catalyst can beextensively dehydrochlorinated by aqueous potassium hydroxide.The molar mass of the PEG used as phase transfer catalyst isranged from 200 to 800 g mol -1 According to the results ofelemental analysis and UV-visible, Fourier transform-infrared(FT-IR) and FT-Raman spectra, the polyene films obtained fromthese systems are polyacetylene-like and contain relatively longconjugated sequences. The highest conversion of the reaction atroom temperature is measured to be about 90% (fH) Theconductivity of iodine-doped polyene films can reach to the orderof 10-2 S cm -1. The electrochemical doping process ofdehydrochlorinated PVC film is controlled by diffusionmechanism like polyacetylene, and some irreversible degradationat the polyene surface occurs when the potential is rising above 1.6 V.