凝胶点前氯乙烯－邻苯二甲酸二烯丙基酯共聚物表征，支化度模型及悬挂双键活性

THE CHARACTERIZATION OF VINYL CHLORIDEDIALLYLPHTHALATE COPOLYMER, MODEL OF BRANCH DEGREE AND THE ACTIVITY OF PENDANT DOUBLE BOND BEFORE GEL POINT

根据单烯－二烯自由基共聚合反应特点，提出一种新的支化点对分子量的分布模型，讨论了用凝胶色谱－特性粘数法表征文化聚合物时，文化点对分子量分布和式［η］０，ｂ／［η］０．１＝ｇ０中的指数ｃ对结果的影响．建立了氯乙烯－二烯类单体悬浮聚合凝胶点前的平均支化度模型．用凝胶点前平均文化度和平均分子量模型拟合实验结果发现：ａ．新的支化分布模型更合理，且ｃ＝０．７２；ｂ．悬挂双键活性下降一个数量级；ｃ．对本文样品，特性粘数和分了量仍符合Ｍａｒｋ－Ｈｏｕｗｉｎｋ方程，［η］＝０．２３５７Ｍ￣０．５２７．

new model of branch point distribution of copolymer regarding molecular weight was postulated from the speciality of monovinyl-divinyl radical copolymerization. The effects of the model of branch point distribution and the index c in the relation [η]0.b /[η]0.1=g0 on the structure characterization of polymer with long-chain branches was discussed with the GPC-intrinsic viscosity method. A model of average branch density of copolymer before gel point was derived from vinyl chloride-divinyl suspension polymerization. The results of experiment were fitted with the models of average branch density and molecular weight before gel point, and it was found that the models fitted very well with the results of experiment with the new model of branch point distribution and c=0.72.It was concluded that the pendent double bond reactivity reduced by an order, and the crosslinking reaction was controlled by disffusion. At last, the correlation of intrinsic viscosity with viscosity average molecular weight was formulated well with [η]=0.2357M.