EPDM绝热层常用组分对交联剂DCP热分解行为的影响

摘要

采用热重-差示扫描量热法(TG-DSC)和气相色谱-质谱法(GC-MS)分别研究了白炭黑、硬脂酸和氧化镁对过氧化二异丙苯(DCP)的热分解特性和热分解产物的影响,还研究了白炭黑和硬脂酸对DCP热分解影响的机理.结果表明,白炭黑对DCP的热分解具有催化作用,显著降低DCP热分解活化能,催化DCP热解产物α,α-二甲基苄醇发生脱水反应生成α-甲基苯乙烯,同时加剧β-消除反应生成α-甲基苯乙酮；硬脂酸对DCP热分解峰温以及活化能无显著影响,但具有微弱催化α,α-二甲基苄醇脱水生成α-甲基苯乙烯和加剧β-消除反应生成α-甲基苯乙酮的作用；氧化镁对DCP热分解行为几乎没有影响.%The effects of silica,stearic acid and magnesium oxide on thermal decomposition of dicumyl peroxide (DCP) and its decomposition products were investigated by means of thermal gravimetry-differential scanning calorimetry (TG-DSC) and gas chromatography-mass spectrum (GC-MS)respectively.The influence mechanism of silica and stearic acid on thermal decomposition of DCP were also analyzed.Results show that silica has catalytic effect on thermal decomposition of DCP,and can obviously reduce the activation energy for thermal decomposition of DCP.It was found that silica can also catalyze α,α-phenyl dimethyl carbinol to become α-methylstyrene,and can accelerateβ-eliminate reaction to produce α-acetophenone; Stearic acid has little effect on peak temperature and activation energy of DCP thermal decomposition reation,however,it has weak influence to catalyze α,α-phenyl dimethyl carbinol to α-methylstyrene,and accelerateβ-eliminate reaction;Magnesium oxide (MgO) has little effect on thermal decomposition of DCP.