Norbornadiene homopolymerization and norbornene/norbornadiene/1-octene terpolymerization by ansa-fluorenylamidotitanium-based catalysts,Polymer Chemistry

当前位置： X-MOL 学术 › Polym. Chem. › 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.)

Norbornadiene homopolymerization and norbornene/norbornadiene/1-octene terpolymerization by ansa-fluorenylamidotitanium-based catalysts
Polymer Chemistry ( IF 4.1 ) Pub Date : 2020-10-06 , DOI: 10.1039/d0py01180k
Hongyi Suo _{1,

2,

3,

4,

5} , Haobo Yuan _{6,

7,

8,

9,

10} , Ryo Tanaka _{6,

7,

8,

9,

10} , Yuushou Nakayama _{6,

7,

8,

9,

10} , Wen-Hua Sun _{1,

2,

3,

4,

5} , Takeshi Shiono _{6,

7,

8,

9,

10}

Affiliation

ansa-Fluorenylamidotitanium complexes Me₂Si(Flu)(N^tBu)TiMe₂ (1) and Me₂Si(2,7-^tBu₂Flu)(N^tBu)TiMe₂ (2) were used as precatalysts for the homopolymerization of norbornadiene (NBD) and the terpolymerization of NBD, norbornene (NB), and 1-octene (OC). In the NBD homopolymerization, catalyst 2 showed double the conversion and yielded a polymer having more than double the molecular weight compared with catalyst 1 when activated by modified methylaluminoxane (MMAO). The conversion and molecular weight were significantly increased by changing the cocatalyst from MMAO to [Ph₃C][B(C₆F₅)₄]. The conversion levels after 10 min polymerization using 2-[Ph₃C][B(C₆F₅)₄] at 25 and 0 °C were 52% and 62%, respectively. The conversion reached 82% at 0 °C after 1 h, and soluble polyNBD with a number-average molecular weight (M_n) of 34 100 was obtained. The 2-[Ph₃C][B(C₆F₅)₄] catalytic system also showed the best performance for NBD/NB/OC terpolymerization among the four combinations of precatalyst/cocatalyst and gave the terpolymer with M_n of 66 300 containing 13 mol% of NBD at 64% conversion after 10 min polymerization at 0 °C. All resulting polymers possessed good solubility, indicating that crosslinking via the NB unit derived from NBD was negligible.

中文翻译：

氨基苯甲酸芴基enyl基钛催化剂催化降冰片二烯均聚和降冰片烯/降冰片二烯/ 1-辛烯三元聚合

安莎-Fluorenylamidotitanium络合物我₂的Si（流感）（N^吨丁基）时间₂（1）和Me ₂的Si（2,7-^吨卜₂流感）（N^吨丁基）时间₂（2）作为预催化剂用于降冰片二烯（NBD）的均聚和NBD，降冰片烯（NB）和1-辛烯（OC）的三元聚合。在NBD均聚中，催化剂2显示出两倍的转化率，并且得到的聚合物的分子量是催化剂1中的两倍以上。当被改性的甲基铝氧烷（MMAO）激活时。通过将助催化剂从MMAO更改为[Ph ₃ C] [B（C ₆ F ₅）₄ ] ，可以显着提高转化率和分子量。在25℃和0℃下使用2- [Ph ₃ C] [B（C ₆ F ₅）₄ ]聚合10分钟后的转化率分别为52％和62％。1小时后，在0°C时转化率达到82％，并获得了数均分子量（M _n）为34 100的可溶性聚NBD 。的2 - [PH ₃ C] [B（C ₆ ˚F ₅）₄]催化体系在预催化剂/助催化剂的四种组合中也显示出最佳的NBD / NB / OC三元聚合性能，并在0°聚合10分钟后得到M _n为66 300的三元共聚物，其中Nb的含量为13％（摩尔），NBD的转化率为64％。 C。所有所得聚合物均具有良好的溶解性，表明通过衍生自NBD的NB单元的交联可忽略不计。

更新日期：2020-11-03

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11