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以二氯磷酸苯酯(PDCP)、乙二醇(EG)、甲醇、甲基丙烯酸-β羟乙酯(HEMA)为原料,经逐步聚合得到端乙烯基低聚磷酸酯的磷元素杂化大单体(VOPP),VOPP与苯乙烯(St)通过接枝共聚制备磷元素杂化大单体接枝聚苯乙烯共聚物(VOPP-co-St)。利用FTIR和凝胶渗透色谱(GPC)表征VOPP的结构及平均分子量,通过TGA、氧指数测定仪和微型量热仪研究VOPP-co-St的热稳定性及阻燃性能,SEM和XPS表征炭层形貌及成分,利用Flynn-Wall-Ozawa(FWO)法计算VOPP-co-St的热降解活化能(Ea)。结果表明,随着VOPP含量的增加,VOPP-co-St的最大分解速率温度升高,残重率提高,极限氧指数(LOI)上升,热释放速率峰值(PHRR)降低,总热释放量(THR)减小,熔滴现象消失,Ea随降解转化率增大而增大。
By using PDCP, EG, methanol and β-hydroxyethyl methacrylate (HEMA) as raw materials, the polymer of terminal vinyl oligophosphates was polymerized gradually (VOPP), VOPP and styrene (St) prepared by graft copolymerization of phosphorus-based hybrid macromonomer graft polystyrene copolymer (VOPP-co-St). The structure and average molecular weight of VOPP were characterized by FTIR and GPC. The thermal stability and flame retardancy of VOPP-co-St were investigated by TGA, Oxygen Index and Microcalorimetry. SEM and XPS were used to characterize the structure and average molecular weight of VOPP. Layer morphology and composition, the thermal degradation activation energy (Ea) of VOPP-co-St was calculated by Flynn-Wall-Ozawa (FWO) method. The results showed that with the increase of VOPP content, the maximum decomposition rate of VOPP-co-St increased with the increase of residual weight, the limiting oxygen index (LOI), the peak of heat release rate (PHRR) and the total heat release THR) decreases, droplet disappears, Ea increases with the degradation conversion rate.