Thermal behaviour of polystyrene, polysulfone and their substituted derivatives

摘要

The thermal stabilities of polystyrene (PS), polysulfone (PSF), poly(p-chloromethyl) styrene (CMPS), chloromethylated polysulfone (CMPSF), and their corresponding derivatives substituted with 2-(N,N-dimethylamino)ethanol (HAPS, HAPSF) or tri-ethylamine (APS, APSF) were investigated. The influence of the chemical structure on the thermal stability was assessed by thermogravimetric analysis in the dynamic conditions of temperature and atmospheric air. The substituted compounds undergo a thermal degradation involving a complex mechanism with three steps. These steps are studied from both kinetic parameters and thermogravimetric characteristics points of view. The chloromethylation reaction and subsequent substitution reaction of chlorine atom with alkyl and hydroxyalkylamines led to a significant decrease of the thermal stability of both PS and PSF polymers. The following series was established: PS > CMPS > HAPS > APS (for PS series), and PSF > CMPSF > HAPSF > APSF (for PSF series, respectively).