高顺式嵌段共聚物合成及其增强增韧作用的研究

The coordination polymerization of butadiene (Bd) and styrene (St) was carried out by using rare earth catalyst system (ND+AL+CF+SOL) under a range of experimental conditions. The effect of the contents in catalyst system, the preparation of catalyst and the polymerization conditions on copolymerization, the molecular weight and the microstructure of corresponding copolymer. The copolymer samples were characterized by FTIR, 1H-NMR, 13C-NMR, TEM and GPC. It is demonstrated that novel St-Bd diblock copolymer with molecular weight of 1.0×104 to 2.4×105 g/mol and with styrene units of 8％ to 25％mole could be synthesized under the appropriate reaction conditions. The analysis of the copolymer microstructure suggests that the butadiene sequences are primarily cis-1,4 and the styrene segments are actatic. The microgragh of the copolymer morphology shows phase seperation of rubber segment and plastic segment.

本课题立足于大分子设计，通过改进催化剂反应活性与选择性，进行丁二烯配位共聚，合成高顺式、高分子量、合适苯乙烯单元结合量的嵌段共聚物；经与聚苯乙烯共混，探索该共聚物微观结构与其增强增韧作用的关系，反过来指导设计合成共聚物。由通用单体共聚反应设计合成新型高分子材料，为通用塑料改性提供新途径。..