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本文对于氯乙烯悬浮聚合反应的机理及其动力学进行了研究。由于PVC及其大分子自由基不溶解于其单体内但能被其单体所溶胀的特性所规定,双基链终止(偶合或岐化)较难发生。如所用引发剂与非链转移剂(例如AIBN),则大分子自由基与其单体之间的链转移反应,将成为其唯一的或起主导作用的链终止过程。根据上述机理进厅了聚合反应动力学方程的理论推导,以AIBN作引发剂的聚合反应速度自动加速的原因以及对引发剂的反应级数等问题,作了分析研究和探讨。所推导的动力学方程在氯乙烯悬浮聚合反应中获得了充分地验证,取得了满意的结果。
In this paper, the mechanism and kinetics of vinyl chloride suspension polymerization were studied. Due to the PVC and its macromolecular free radicals are not dissolved in its monomer but can be swollen by the characteristics of its monomer provided double chain termination (coupling or disproportionation) is more difficult. Such as the initiator used and the non-chain transfer agent (eg, AIBN), the chain transfer reaction between the macromolecular radical and its monomer will be its sole or dominant chain termination. According to the above mechanism, the theoretical derivation of the kinetic equation of polymerization reaction, the reason of accelerating the polymerization speed by AIBN as initiator and the reaction order of the initiator are analyzed and discussed. The kinetic equation deduced in the vinyl chloride suspension polymerization has been fully verified and satisfactory results have been obtained.