期刊
CHINESE JOURNAL OF POLYMER SCIENCE
卷 41, 期 3, 页码 356-364出版社
SPRINGER
DOI: 10.1007/s10118-022-2855-5
关键词
Polynorbornene; Salicylaldiminate ligand; Vinyl polymerization
In this study, it was unexpectedly found that the solubility of insoluble polynorbornene (PNB) products can be significantly improved by incorporating specific ligands, allowing for detailed analysis of the polymer products. It was also observed that high-temperature polymerization improves the solubility of PNB.
Late transition metals have long served as workhorses for vinyl polymerization of norbornene derivatives. Nevertheless, for such catalytic systems, insoluble polynorbornene (PNB) products are often produced which hampers their further detailed characterizations, such as molecular weights, polydispersities, stereoregularities, etc. In this work, we surprisingly found that for a traditional Ni(acac)(2)/MAO system that was previously reported to give insoluble PNBs, incorporation of highly bulk salicylaldiminate ligands could significantly improve the solubility of the PNBs in common organic solvents, which allowed for subsequent thorough detailed analysis of the polymer products. Moreover, it was also observed that high-temperature polymerization was beneficial for further improving the PNB's solubilities due to the decreased molecular weights and stereoregularities. Different ligand skeletons and ligand equivalents were also investigated to give a comprehensive view of their influences on the polymers' solubilities, and based on these results, a plausible mechanism that caused such a big difference was tentatively proposed.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据