Thermally resilient cobalt ethylene polymerization catalysts under the joint influence of co-catalyst, gem-dimethyl substitution and ortho-cycloalkyl ring size
作者:Randi Zhang、Yongfeng Huang、Yanping Ma、Gregory A. Solan、Xinquan Hu、Tongling Liang、Wen-Hua Sun
DOI:10.1016/j.polymer.2021.123684
日期:2021.4
groups. Complexes Co1 – Co6, on interaction with MAO, were highly active catalysts for ethylene polymerization reaching a maximum level of 9.21 × 106 g PE mol−1 (Co) h−1 at 70 oC for cyclopentyl-containing Co1 and Co4. Strictly linear polyethylenes with low molecular weights (Mw range: 9.25 – 38.5 kg mol-1) and narrow dispersities were generated with selectivities for vinyl-terminated polymers approaching
的N,N,N” -chelated 2-(1-芳基亚氨基)乙基-8-芳基亚氨基-7,7-二甲基-5,6-二氢喹啉钴(II)氯化物络合物,CO1(芳基= 2-(C 5 H 9)-6-MeC 6 H 3),Co2(芳基= 2-(C 6 H 11)-6-MeC 6 H 3),Co3(芳基= 2-(C 8 H 15)-6-MeC 6 H 3),Co4(芳基= 2-(C 5 H 9)-4,6-Me 2 C 6 H 2),Co5(芳基= 2-(C 6 H 11)-4,6-Me 2 C 6 H 2)和Co6(芳基= 2-(C 8 H 15)-4,6-Me 2 C 6 H 3)具有使用简单的一锅法以合理的产率分离得到。Co1和Co5的分子结构不仅强调存在于碳环稠合的三齿配体中的宝石-二甲基取代,而且强调由邻-环烷基基团施加的基本空间性质。复合物Co1 – Co6与MAO相互作用时,是用于乙烯聚合的高活性催化剂,在70