取代芳基钛酸酯类化合物催化苯乙烯间规聚合

Syndiotactic Polymerization of Styrene Catalyzed by Substituted Aromatic Titanate Complexes

以取代芳基钛酸酯化合物为催化剂催化苯乙烯聚合,考察了催化剂、聚合温度,摩尔比nAl/nTi以及聚合时间等因素对聚合行为及产物性质的影响。并用13C-NMR、FT-IR、DSC等手段表征了聚合产物。结果表明:在nAl/nTi=1 000,聚合温度为60℃条件下,2,2′-硫代双(4-甲基-6-叔丁基酚氧基)二氯化钛催化苯乙烯聚合显示出很高的催化活性,其活性为6.87×105g sPS/(mol Ti.h),所得聚合物为间规聚苯乙烯,间规度96.9%,分子量为1.98×105。

Styrene is polymerized using methylaluminoxane-activated substituted aromatic titanate complexes, the influence of complexes with different ligands, nA1/nTi, polymerization temperature and polymerization time on catalyst activity are investigated. The polymeric products are characterized with ^13 C-NMR, FT-IR, DSC respectively. The results show that （tbp）TiCl2/MAO has higher activity for syndiotactic polymerization of styrene under the nA1/nTi = 1 000, polymerization tempera-ture of 60 ℃, the activity is 6.87 × 10^5g sPS/（molTi · h） and syndiotactivity of sPS obtained is 96.9%.