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采用本体聚合法,以TiCl_4/Al(i-Bu)_3催化共聚1-辛烯/1-十二烯,合成了超高相对分子质量的油溶性聚合物。用~1H NMR和GPC表征共聚物的构成和相对分子质量及其分布。研究了辛烯加入量对共聚物相对分子质量以及抗剪切稳定性的影响,考察了超声剪切对共聚物相对分子质量分布的影响。结果表明,在最佳聚合条件(十二烯用量50 mL、辛烯用量10 mL、TiCl_4用量0.0157 g、A1(i-Bu)_3用量0.2 mL、反应温度0℃,反应时间48 h)下,共聚物的M_w=7.82×10~6,分散度D=1.98;辛烯用量对共聚物的相对分子质量有明显影响,但分散度变化幅度不大(M_w/M_n=1.8～2.5);辛烯用量对提高共聚物的抗剪切性能无明显作用;共聚物被超声剪切后,其相对分子质量分布为双峰分布,不属于拓扑断裂模型。
The bulk polymerization method was used to synthesize 1-octene / 1-dodecene catalyzed by TiCl_4 / Al (i-Bu) _3 to synthesize an oil-soluble polymer with high relative molecular weight. The structure and relative molecular mass of the copolymers and their distribution were characterized by ~ 1H NMR and GPC. The effects of the amount of octene added on the molecular weight of the copolymer and the shear stability were investigated. The influence of ultrasonic shear on the molecular weight distribution of the copolymer was also investigated. The results showed that under the optimum conditions of polymerization (50 mL of dodecene, 10 mL of octene, 0.0157 g of TiCl 4, 0.2 mL of A1 (i-Bu) 3), the reaction temperature was 0 ℃ and the reaction time was 48 h. The copolymer M_w = 7.82 × 10 ~ 6, polydispersity D = 1.98; the amount of octene had a significant effect on the relative molecular weight of the copolymer, but the dispersion did not change much (M_w / M_n = 1.8-2.5) The amount of the copolymer has no obvious effect on improving the shear resistance of the copolymer. After being sheared by ultrasonic, the relative molecular mass distribution of the copolymer is bimodal and does not belong to the topological fracture model.