论文部分内容阅读
将阴离子聚合所得末端带有烯丙基的窄分布聚苯乙烯大分子单体(PSallyl)与乙烯、丙烯在钒催化体系下进行共聚合,得到聚苯乙烯(PS)支链沿乙丙橡胶(EPR)主干无规分布的接枝共聚物EPR-g-PS。接枝效率为70％左右。大分子单体的分子量、加入量,催化剂浓度和聚合温度等对共聚反应及其产物结构有明显的影响。丁酮为选择沉淀剂可分离未反应的聚苯乙烯大分子单体。用紫外光谱、核磁共振、渗透压和凝胶渗透色谱法测定了纯制接枝共聚物的组成和分子量。结果表明所合成的EPR-g-PS的聚苯乙烯含量为5—45％;支链为分子量1.0—7.8×10~4的窄分布((?)=1.05—1.17)聚苯乙烯;平均支链数为1—4。
The anionic polymerization of the terminal allyl group of narrow distribution of polystyrene macromonomer (PSallyl) and ethylene, propylene copolymerization in a vanadium catalyst system to obtain a polystyrene (PS) branched ethylene propylene rubber ( EPR) trunk random distribution of the graft copolymer EPR-g-PS. Grafting efficiency of about 70%. The molecular weight of the macromonomer, the amount of addition, the concentration of the catalyst and the polymerization temperature have obvious influence on the copolymerization reaction and the product structure. Butanone is a selective precipitant to separate unreacted polystyrene macromer. The composition and molecular weight of the pure graft copolymer were determined by UV spectroscopy, nuclear magnetic resonance, osmotic pressure and gel permeation chromatography. The results showed that the content of polystyrene in the synthesized EPR-g-PS was 5-45%, the distribution of branches was narrow (1.05-1.17) with the molecular weight of 1.0-7.8 × 10-4 and the average branch The chain number is 1-4.