【摘要】 <正> 氯乙烯-马来酸二乙酯共聚树脂(氯-马树脂)是一种聚氯乙烯改性树脂。其特点为:可以用廉价的氯化石蜡代替增塑剂DBP,而树脂仍具有好的使用性能。本工作是先将氯-马树脂样品进行童沉淀分级,取得分子量较均一的各个级场,然后用快速动态渗透压和静态渗透压法测走其数均分子量;用光散射法测定其重均分子量;用粘度法测更多还原

【Abstract】 A poly (vinyl chloride diethyl maleate) copolymer has been fractionated by repeated precipitation method. All fractions and the unfractionated sample have been characterized by viscometry, dynamic osmometry, Zimm static osmometry, light scattering and gel permeation chromatography. After correction for polydispersity, a monodis-persed [η] -M relationship has been obtaind:[η] = 1.99 × 10-3M0.87 (ml/g,at 25℃, in cyclohexanone)For the copolymer solution in THF, the second virial coefficient a decreases as the molecular weight increases. The relationship isA2 = 2 slope(Mn RT)-1/2.更多还原