期刊
POLYMER
卷 212, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2020.123133
关键词
Cycloaddition polymerization; Hyperbranched polymer; Cyclotrimerization; Diyne; Internal alkyne; Cobalt catalyst
资金
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan [25288057]
- Grants-in-Aid for Scientific Research [25288057] Funding Source: KAKEN
The novel synthetic method for hyperbranched polymers utilizes a cobalt catalyst to promote the successful polymerization of aromatic diynes with internal alkynes, resulting in soluble polymers without the production of insoluble materials. The resulting polymer's molecular weight and degree of branching can be controlled by selecting the internal alkyne monomer and adjusting its loading amount.
A novel synthetic method for hyperbranched polymers is reported. A cobalt catalyst previously developed in our group promotes the catalytic alkyne [2 + 2 + 2] cycloaddition polymerization of aromatic diynes with internal alkynes, which proceeds without gelation or production of insoluble materials to give the corresponding soluble polymer in good yields. The method is reproducible, and the polymerization behavior can readily be predicted by the results of model reactions. Thus, the molecular weight and a degree of branching (DB) of the resulting polymer can be controlled by selecting the internal alkyne monomer and its loading amount. The occurrence of effective endcapping reaction was confirmed by degradation of the polymer derived from a diyne bearing a silyl ether linker, and a high DB of more than 0.5 was obtained.
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