负载钛催化体系催化合成低相对分子质量聚丁烯-1

Synthesis of low relative molecular mass polybutene-1 with supported titanium catalyst system

以氢气为相对分子质量调节剂,采用自制的TiCl4/MgCl2-Al(i-Bu)3负载钛催化体系,合成了聚丁烯-1热塑性弹性体(PBt-TPE)。在3L釜中考察了Al/Ti、Ti/Bt、氢气压力及聚合温度对单体转化率、相对分子质量、乙醚中不溶物含量及结晶度的影响。结果表明:氢气压力能够有效调节聚合物的相对分子质量,随聚合温度的升高,聚合物转化率和相对分子质量先升高后降低;乙醚中不溶物含量呈降低趋势。

With the addition of hydrogen as a relative molecular mass regulator and TiCl4/MgCl2Al（i-Bu）3 catalyst system, polybutene-1 thermoplastic elastomer （PBt-TPE） was synthesized in 3 L autoclave. The conversion, relative molecular mass, insoluble content in ether and crystallization of PBt-TPE were studied under various polymerization conditions such as hydrogen pressure, temperature, Al/Ti and Ti/Bt ratio. It was showed that hydrogen pressure was effective to relative molecular mass of PBt-TPE. With the increasing of the polymerization temperature, monomer conversion and relative molecular mass all increased first and then decreased, while insoluble content in ether decreased; The PBt-TPE was token with DSC and IR.