Dynamic viscoelasticity of polyacetylene during oxidation

Abstract

Dynamic viscoelasticity measurements at 90 "C suggest an oxidation process for pristine polyacetylenes (PA's). For &rich PA, the oxidation can be divided into three regions: surface oxidation, bulk oxidation, and crosslinking. Crosslinking also occurs at the end of the surface oxidation period but does not occur in the bulk reaction period. For frans-rich PA, oxygen doping was complete after the first 15 min and occurred to a smaller extent than that of the cisrich PA. The rate of reaction of trans PA chains with oxygen is slow in comparison to that of crosslinking by radical combination or addition reactions with the PA chains. In the case of trans PA the concentration of radical chains formed by reaction with oxygen retains a steady value after the initial period up to the end of oxidation. 0025-1 16X/84/$03 .OO