The thermal stability and thermal degradation of blends of syndiotactic polystyrene and polyphenylene ether
作者： S. Stack , O. O'Donoghue , C. Birkinshaw
DOI: 10.1016/S0141-3910(02)00235-5
关键词: Polymer 、 Tacticity 、 Polystyrene 、 Differential scanning calorimetry 、 Crystallization 、 Polymer blend 、 Polymer chemistry 、 Chemical engineering 、 Glass transition 、 Materials science 、 Thermal stability
摘要: Blends of syndiotactic polystyrene (sPS) and polyphenylene ether (PPE) have been prepared by co-precipitation from solution, followed compression moulding. Three different molecular weight polystyrenes were used. Differential scanning calorimetry shows that partial crystallization the sPS occurs, but a single glass transition indicates blend components are miscible in amorphous phase. Thermogravimetry has used to compare thermal stability blends pure polymers, IR spectroscopy give information on structural changes consequent upon heating. The three degraded an identical manner, suggesting initiation is random chain scission. onset degradation occurs at higher temperatures than polymer indicating stabilisaton component, whilst PPE accelerated relative polymer. undergoes rearrangement which link broken continuity re-established through methyl group before any mass loss apparent. coincident with temperature this it proposed acts as radical acceptor, interrupting intermolecular transfer process degrading polystyrene. This cross-termination limits consequently reduces ultimate
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