α-己烯/α-辛烯/α-十二烯三元聚合物特性黏数研究

摘要

采用本体聚合法,以TiCl4/Al(Et)3为复合催化剂、α-烯烃为单体,合成α-己烯/α-辛烯/α-十二烯三元聚合物,考察反应条件对聚合物特性黏数的影响.采用FT-IR,1 H-NMR,XRD等表征手段对聚合物结构进行表征.结果表明,在主催化剂TiCl4用量0.095 g、助催化剂Al(Et)3用量0.12 mL、聚合温度-3℃、V(α-十二烯)∶V(α-辛烯)∶V(α-己烯)为4∶2∶1(单体总体积40 mL)、聚合时间48 h的最佳聚合条件下,聚合物的特性黏数达到15.40 dL/g.表征结果表明:聚合物可以看成是拟合成的物质,经乙醇洗涤后可以得到基本不含单体的烯烃聚合物；合成的聚合物为结晶度较低的α-烯烃聚合物.%A terpolymer of orhexylene/α-octene/ordodecene was synthesized by bulk polymerization using TiCL,/Al(Et)3composite catalyst and α-olefin monomers. Effects of polymerization conditions on the intrinsic viscosity of polymer were investigated. The experimental results showed that under the optimum polymerization conditions of using 0. 095 g of main catalyst TiCl4 and 0. 12 mL of co-catalyst Al(Et)3, V(α-dodecene):V(α-octene):V(α-hexylene)=4:2:1 (total monomers volume of 40 mL), reaction temperature of —3℃ and reaction time of 48 h, the intrinsic viscosity of the synthesized polymer could be up to 15. 40 dL/g. The characterization results by FT-IR, XRD and 1 H NMR showed that after alcohol washing, the synthesized polymer was free of monomers, and it was the objective a-olefin polymer with low crystallinity to be used as drag reduction agent.