EPDM绝热层常用组分对交联剂DCP热分解行为的影响  

Effects of common ingredients in EPDM insulation on thermal decomposition behaviors of dicumyl peroxide as crosslinking agent

作　　者：王明超[1] 马新刚[1] 凌玲[1] 胡伟[1] 罗岚[1] 聂松[1] 王敏[1] 

机构地区：[1]中国航天科技集团公司四院四十二所,襄阳441003

出　　处：《固体火箭技术》2013年第3期376-380,共5页Journal of Solid Rocket Technology

基　　金：国家973项目(613142)

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 chro- matography-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 c~,a-phenyl dimethyl carbinol to be- come c^-methylstyrene, and can accelerate E-eliminate reaction to produce α-acetophenone; Stearic acid has little effect on peak tem- perature and activation energy of DCP thermal decomposition reation, however, it has weak influence to catalyze α, α-phenyl dimethyl carbinol to α-methylstyrene, and accelerate E-eliminate reaction;Magnesium oxide （MgO） has little effect on thermal decomposition of DCP.

关 键 词：过氧化二异丙苯 EPDM绝热层常用组分 热分解 TG-DSC GC-MS 

分 类 号：V512[航空宇航科学与技术—航空宇航推进理论与工程]