Abstract: Thermal degradation of polystyrene was investigated with thermogravimetry-mass spectrum analysis (TG-MS). The selectivity of styrene was much higher than other degradation products，suggesting initiation of thermal degradation from chain end scission. Styrene dimer appeared at the last stage of polystyrene degradation，indicating that styrene dimer was possibly the residue of polystyrene degradation

摘要： 采用热重质谱法研究了聚苯乙烯的热降解过程。研究发现降解产物中苯乙烯的选择性远高于其它产物，推测聚苯乙烯热降解主要为链端断裂引发；苯乙烯二聚体在聚苯乙烯降解基本完全时出现，可能是降解结束阶段的剩余物。