甲基丙烯酸丁酯过氧化物低聚物的制备及其引发作用

Preparation and Initiating Performance of Poly(butyl methacrylate)

摘要: 以甲基丙烯酸丁酯（BMA）为单体、偶氮二异丁腈（AIBN）为引发剂，在不同温度、不同氧气分压条件下分别制备了一系列相对分子质量不同的甲基丙烯酸丁酯过氧化物低聚物(PBMAP)。采用红外光谱、核磁波谱、元素分析等方法对PBMAP的结构进行表征，采用凝胶渗透色谱（GPC）测量其相对分子质量，通过DSC、TG对其热性能进行分析，并在不同温度下考察了PBMAP引发BMA自由基聚合的能力。结果表明，BMA与氧气反应形成了PBMAP，这类低聚物的分子结构为BMA单体单元与氧气的无规共聚，当温度大于其分解温度时可引发自由基聚合。

Abstract: A series of poly(butyl methacrylate)(PBMAP) oligomers with different relative molecular weights were prepared using butyl methacrylate(BMA) as monomer and azodiisobutyronitrile(AIBN) as initiator at different temperatures and oxygen pressures. The structure of PBMAP was characterized by IR, NMR and EL. The relative molecular weight of PBMAP was measured by GPC. Thermal properties of PBMAP were analyzed by DSC and TG. The initiation ability of PBMAP on free radical polymerization of BMA at different temperatures was investigated. The results show that PBMAP is a random copolymer of BMA and oxygen. PBMAP can initiate free radical polymerization above its decomposition temperature.