反式-1,4-聚异戊二烯相对分子质量的调节  

Control of relative molecular mass of trans-1,4-polyisoprene

作　　者：宋景社[1] 马祖伟[1] 黄宝琛[1] 刘向峰[1] 孙立梅[1] 余鼎声[2] 

机构地区：[1]青岛化工学院高分子材料系,山东青岛266042 [2]北京化工大学材料科学与工程学院,北京100029

出　　处：《合成橡胶工业》2002年第1期24-27,共4页China Synthetic Rubber Industry

基　　金：国家自然科学基金资助项目(29574166;59673004);国家"863"计划新材料领域资助项目(863-715-007-0040)。

摘　　要：采用负载钛本体沉淀聚合法,以氢气作链转移剂,制备了不同相对分子质量的反式-1,4-聚异戊二烯(TPI),讨论了老化、氢气调节及塑炼对其相对分子质量的影响,以及不同相对分子质量TPI的结构与性能。结果表明,本体系合成TPI的数均相对分子质量为(5～15)×104,相对分子质量分布为2.00～3.00;门尼粘度为20～120时,随着TPI相对分子质量的降低,其结晶速度提高,结晶度无明显变化,拉伸强度明显降低,扯断伸长率、屈服强度和邵尔A型硬度无明显变化。Trans-1, 4-polyisoprene (TPI) was synthesized with bulk precipitation process and supported titanium catalyst. Hydrogen was introduced as a relative molecular mass modifier and a series of TPI with different relative molecular mass were obtained. Effect of aging, hydrogen pressure and tight milling on relative molecular mass was studied. The results showed the average Mn of TPI polymerized by this method was (5-15)×104, relative molecular mass distribution was 2.00-3.00. Effect of relative molecular mass on structure and property of TPL was also studied. The results showed that the Mooney viscosity was 20-120 with the decrease of relative molecular mass, crystallization rate of TPI increased, tensile strength decreased notably, crystallinity, elongation at break, yield strength and Shore A hardness changed little.

关 键 词：反式-1 4-聚异戊二烯 相对分子质量 氢气 链转移 结晶 物理机械性能 橡胶 

分 类 号：TQ333.3[化学工程—橡胶工业]