Mechanical and macromolecular changes during thermal degradation of polyphenylsulfone

Polyphenylsulfone was thermally aged at temperatures corresponding to its processing and mainly shown undergo crosslinking as observed by measurements of average molar mass, rheometry changes in glass transition temperature. Those experiments were completed mechanical testing thin sample films 250 280 °C. The same degradation mechanisms result a strong decrease ultimate strain accompanied slight elastic modulus yield stress. Overall results discussed using well know structure-properties relationships.