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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 magnesia on the formation of dicumyl peroxide (DCP) were investigated by thermogravimetry-differential scanning calorimetry (TG-DSC) and gas chromatography-mass spectrometry Thermal decomposition characteristics and thermal decomposition products, the effect of silica and stearic acid on the thermal decomposition of DCP was also investigated. The results show that silica has a catalytic effect on the thermal decomposition of DCP, significantly reduces the activation energy of DCP, and catalyzes the dehydration reaction of α, α-dimethylbenzyl alcohol, which is the pyrolysis product of DCP, to α-methylstyrene, β-elimination reaction to produce α-methylacetophenone. Stearic acid had no significant effect on the peak temperature and activation energy of DCP thermal decomposition, but had a weak catalytic effect on the dehydration of α, α-dimethylbenzyl alcohol to α-methylstyrene And aggravate the role of β-elimination reaction to produce α-methylacetophenone. Magnesium oxide has almost no effect on the thermal decomposition behavior of DCP.