可调 bis ((pyridinium amidate) 连接物有效地促进了催化乙烯的聚合
Esaïe Reusser1, Martin Albrecht1
1Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern Freiestrasse 3 3012 Bern Switzerland martin.albrecht@unibe.ch.
新的催化剂含有bis ((pyridinium amidate) (bisPYA) 连接体,可以有效地共聚乙烯和功能烯酸. 立体锁定联体增强乙烯转化,产生高性能聚乙烯材料.
科学领域:
- 有机金属化学 有机金属化学
- 聚合物科学 聚合物科学
- 催化剂是一种催化剂.
背景情况:
- 帕拉催化剂对烯酸共聚合具有很高的功能组耐受性.
- 开发用于乙烯和功能性烯共聚合的高效催化剂对于材料科学至关重要.
研究的目的:
- 合成和评估用于乙烯共聚合的新型复合物与bis(pyridinium amidate) (bisPYA) 连接物.
- 研究连接体结构,特别是固体阻碍对催化活性和聚合物特性的影响.
主要方法:
- 合成具有多种 bisPYA 连接体架构的合物复合物.
- 使用四基[3,5-bis(三甲) ]酸盐 (NaBArF) 激活复合物.
- 在受控条件下的乙烯聚合实验 (室温,1巴乙烯).
主要成果:
- 绝缘锁定 bisPYA 配体显著促进了乙烯转化和聚合物生产.
- 复合4d,包括一个正体胺基 bisPYA 连接体,表现出高活性 (10.8 公斤聚乙烯/mol Pd).
- 与K2CO3或Ag2CO3一起形成导管,导致三金属PdKPd复合体,表明NaBArF在化物抽取和金属封存中的双重作用.
结论:
- 在 bisPYA 配方体中固体锁定是增强催化乙烯聚合的关键.
- 观察到的 adduct 形成凸显了涉及 NaBArF 和金属封存的复杂机制.
- 优化的-bisPYA系统显示出高效生产聚乙烯材料的前景.
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