当前位置: X-MOL 学术Polymer › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Synthesis of Poly(Ethyl vinyl ether) with high molecular weight by rare-earth metal cationic catalysts
Polymer ( IF 4.1 ) Pub Date : 2021-05-01 , DOI: 10.1016/j.polymer.2021.123790
Yang Jiang , Shihui Li , Dongmei Cui

Ethyl vinyl ether (EVE) polymerizations by rare-earth metal complexes were studied. The metallocene complexes 13 activated by organoborate displayed extremely high catalytic activities (≤1.50 × 106 g mol−1 h−1) for EVE polymerization at 25 °C. The non-metallocene complexes 46 were nearly inert under the same conditions. The resultant molecular weights produced by 1/[Ph3C][B(C6F5)4] increased from 2.98 × 104 to 19.3 × 104 g mol−1 with the temperature declining from 0 to −45 °C and the addition of 10 equivalents of AliBu3 to the binary system 1/[Ph3C][B(C6F5)4] resulted in the higher molecular weight product (32.5 × 104 g mol−1) at −45 °C. With the molar ratio of EVE-to-1 increased from 2000:1 to 10000:1, the resultant molecular weight reached 107.3 × 104 g mol−1 but the catalytic activity dropped dramatically from 7.60 × 105 to 0.57 × 105 g molSc−1 h−1. The dicationic species formed by the reaction of 1 with 2 equivalents of [Ph3C][B(C6F5)4] displayed high catalytic activity for EVE polymerization and gave high molecular weight product in the presence of AliBu3.



中文翻译:

稀土金属阳离子催化剂合成高分子量聚乙基乙烯醚

研究了稀土金属络合物对乙基乙烯基醚(EVE)的聚合作用。的茂金属配合物1 - 3由有机硼酸激活显示极高的催化活性(≤1.50×10 6 克摩尔-1  ħ -1在25 EVE聚合)℃。非茂金属络合物4 - 6几乎惰性相同的条件下。由1 / [Ph 3 C] [B(C 6 F 54 ]产生的所得分子量从2.98×10 4增加到19.3×10 4  g mol -1温度从0下降到-45°C,向二元体系1 / [Ph 3 C] [B(C 6 F 54 ]中添加10当量的Al i Bu 3导致分子量更高的产物(32.5×10 4  g mol -1)在-45°C下。随着EVE- 1的摩尔比从2000:1增加到10000:1,所得分子量达到107.3×10 4  g mol -1,但催化活性从7.60×10 5急剧下降至0.57×10 5  g摩尔Sc -1 h -1。通过该反应形成的双阳离子种类1与2个当量的[PH 3 C] [B(C 6 ˚F 54 ]中显示高的催化活性为EVE聚合和得到高分子量产物在Al的存在3

更新日期:2021-05-11
down
wechat
bug