结构因素和配位效应对室温本体聚合的影响

考察了丙烯酸乙酯(EA)、甲基丙烯酸甲酯(MMA)、苯乙烯(St)和丙烯腈(AN)四种不同结构特征的乙烯基单体和桐油(TO)、蓖麻油(CO)两种生物质油在室温(25℃)下以氧化还原引发体系引发的本体均聚合和共聚合反应,以及环烷酸钴的配位效应对聚合的影响。结果表明,室温下取代基的供电性或共轭性越强的单取代烯烃逾难均聚合;苯乙烯不能均聚,也不能与丙烯酸乙酯共聚合;由于空间位阻的原因,桐油和蓖麻油的均聚合以及与其它单体的共聚合在常温下均不能进行;环烷酸钴的配位效应能够提高单体和自由基的活性,促进聚合反应进行。

Effect of Structural Factors and Coordination Effect on Bulk Polymerization at Room Temperature

The bulk homopolymerization and copolymerization of ethylacrylate、methyl methacrylate、styrene、acrylonitrile、toug oil and castor oil,and the coordination effect of cobalt naphthenate on polymerization was investigated by redox initiation system at room temperature (25℃). The results showed that the single substituted olefins with stronger properties of electronic donor and conjugation were more difficult to homopolymerize. Styrene could not homopolymerize and copolymerize with ethyl acrylate due to steric reasons. Homopolymerization of tung oil and castor oil and their copolymerization with synthetic monomers could not carry out at room temperature. The coordination effect of cobalt naphthenate could increase activity of monomer and radical and make the polymerization reaction carry on.