本体聚合法制备高分子减阻剂的特性黏数研究

采用本体聚合法,以TiCl_4/Al(i-Bu)_3为复合催化剂,α-烯烃为单体,合成了α-己烯/α-十二烯二元聚合物(简称高聚物),考察了反应条件对高聚物特性黏数的影响及高聚物共混对共混物特性黏数的影响。实验结果表明,在较佳的高聚物合成条件(主催化剂TiCl_4用量0.08 g、反应温度-5℃、V(α-己烯):V(α-十二烯)=1:3、助催化剂Al(i-Bu)_3用量0.10 mL、反应时间48 h)下,高聚物的特性黏数达到11.10 dL/g;加入少量二苯基二甲氧基硅烷可增大高聚物的特性黏数;共混物的特性黏数均大于单一高聚物的特性黏数;以TiCl_4/Al(Et)_3/Al(i-Bu)_3为复合催化剂时可提高高聚物的特性黏数。XRD和IR表征结果显示,合成的高聚物为结晶度较低的柔性α-烯烃聚合物。

Intrinsic Viscosity of Polymer Drag Reducer Prepared by Bulk Polymerization

A α-hexylene/α-dodecene copolymer was synthesized by bulk polymerization with TiCl₄/Al（i-Bu）₃ catalyst and a-olefin monomers.The effects of reaction conditions including catalyst dosage,V（α-hexylene）/V（α-dodecene） ratio,polymer blending and reaction temperature on the intrinsic viscosity of the copolymer were investigated.The experimental results showed that the intrinsic viscosity of the copolymer could be up to 11.10 dL/g under the optimum conditions of catalyst TiCl₄ 0.08 g,co-catalyst Al（i-Bu）₃0.10 mL,V（α-hexylene）:V（α-dodecene） 1:3,reaction temperature -5℃and reaction time 48 h.The intrinsic viscosity can be improved by adding small amount of diphenyl dimethoxysilane;the intrinsic viscosity of the copolymer is higher than that of the single polymer;and TiCl₄/Al（Et）₃/Al（i-Bu）₃ composite catalyst can increase the intrinsic viscosity of the polymer.The XRD and IR experiments showed that theα-olefin polymer with low degree of crystallinity and flexibility was synthesized.