陈化方式对负载钛催化合成聚1-丁烯的影响

Effect of aging on polymerizing poly(1-butene) with supported titanium catalyst

以TiCl4 (简称Ti) /Al(i-Bu)3 (简称Al)为催化剂,合成了聚1 -丁烯热塑性弹性体,考察了催化剂的陈化温度、陈化时间以及陈化1-丁烯(Bt)用量对转化率、聚合物重均相对分子质量的影响。结果表明,采用0℃下Ti-Al-Bt三元陈化方式制备的催化剂可以有效地提高单体的转化率,降低Al的用量。最佳陈化条件为: Bt/Ti(摩尔比)60,Al/Ti(摩尔比) 20, 0℃, 20min。0℃陈化时,试样的重均相对分子质量比室温陈化的高;三元陈化试样的重均相对分子质量比二元陈化的高。在室温和0℃陈化时,陈化时间较短,试样的重均相对分子质量变化不大;随陈化时间的延长,试样的重均相对分子质量下降。

Poly (1-butene) thermoplastic elastomer was prepared with aging TiCl 4(Ti)/Al( i -Bu) 3 (Al)catalyst. The effects of aging conditions,such as aging temperature,aging time and the amount of 1-butene (Bt) on conversion and weight-average relative molecular mass of poly (1-butene) were studied. The results showed that the conversion of Ti-Al-Bt ternary aging mode at 0 ℃ was always higher. The optimal aging conditions were Bt/Ti (mole ratio) 60, Al/Ti(mole ratio) 20 at 0 ℃ aging for 20 min . The weight-average relative molecular mass of poly(1-butene) was higher when catalyst was aged in Ti-Al-Bt ternary aging mode at 0 ℃. The weight-average relative molecular mass of poly(1-butene) was stable when aging for short time at room temperature and 0 ℃, but decreased when the aging time was longer.