化学
阳离子聚合
烯烃纤维
高分子化学
环氧丙烷
一氧化碳
催化作用
乙丙橡胶
乙烯
位阻效应
共聚物
磷化氢
丙烯酸甲酯
碳酸丙烯酯
丙烯
钯
环氧乙烷
聚合物
有机化学
物理化学
电极
电化学
作者
Shi-Huan Li,Shi‐Yu Chen,Xiao‐Bing Lu,Y. Liu
标识
DOI:10.1021/acs.inorgchem.2c03913
摘要
Commercial polyketone materials are generally produced by palladium-catalyzed terpolymerization of ethylene and α-olefin with carbon monoxide (CO), and rare examples were reported regarding the incorporation of propylene into an ethylene/CO copolymer chain using a cost-effective nickel catalyst. In this study, we have developed a series of [P,O]-type cationic Pd and Ni complexes supported by a diphosphazane monoxide (PNPO) platform, and the electronic and steric effect on phosphine, amine, and phosphine oxide moieties is systematically investigated for terpolymerization in terms of activity, propylene/CO (C3) incorporation, and molecular weight control. It is observed that the melting temperature (Tm) is proportional to the number of C3 incorporations present in the polymer chain, and the incorporated propylene does not affect the degradation temperature substantially, thus broadening the processing temperature window of the resultant polyketones. Notably, in comparison with dppp-type catalysts, PNPO catalysts exhibited a higher preference for propylene consumption, which is of great importance for making more efficient use of α-olefin resources.
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