摘要
以Wessling 偏氯乙烯均聚速率模型为基础,提出了偏氯乙烯/丙烯腈悬浮共聚新的速率模型dx/dt= kxm[I]n0 exp (- nkdt),式中k、m 、n 是模型参数。通过研究单体组成、聚合温度、引发剂浓度等对共聚速率的影响,发现在55~75 ℃之间,m 和n 分别是值为0.143 和0.5 的常数,而k 随温度变化且符合Arrhenius关系式,其表观活化能为87.0 kJ/m ol。在转化率低于85% 时,模型的计算值能较好地与实验测定值相吻合。
Based on Wessling model for vinylidene chloride(VDC) homopolymerization,a new kinetic model, which is d x /d t = kx m[I] n 0 exp (- nk d t ) where k,m and n are the model parameters, is proposed for 69∶31(mol) VDC/acrylonitrile(AN) suspension copolymerization. After studying on the factors which affect on copolymerization rate such as feeding ratio of comonomers, temperature( T ) and initator concentration, it is found that the values of m and n are almost constant with temperature from 55 ℃ to 75 ℃, which are 0.143 and 0.5 respectively. The variation of k with T is consistent with Arrhenius expression and the apparent active energy is 87.0 kJ/mol. The value calculated by our model is consistent well with experiment at conversion lower than 85%.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
1999年第6期69-72,共4页
Polymer Materials Science & Engineering
关键词
偏氯乙烯
丙烯腈
悬浮共聚
聚合
速率模型
vinylidene chloride, acrylonitrile, suspension copolymerization, polymerization rate model