硒化物
高分子化学
亲核细胞
玻璃化转变
化学
热分解
共聚物
硒
磷腈
材料科学
聚酯纤维
聚合物
有机化学
催化作用
作者
Chengjian Zhang,Xiao‐Han Cao,Xinghong Zhang
出处
期刊:Macromolecules
[American Chemical Society]
日期:2019-12-19
卷期号:53 (1): 203-211
被引量:26
标识
DOI:10.1021/acs.macromol.9b02025
摘要
The placement of selenium (Se) atoms into polymers to achieve functional materials for diverse applications in adaptive and biomedical materials has attracted broad interest. However, the difficulty in creating well-defined Se-rich polymers is a critical limitation. In this work, we report the successful alternating and regioselective copolymerization of nonstrained γ-selenobutyrolactone with epoxides. Poly(selenide-alt-ester)s containing selenide and ester groups in each repeating unit are achieved under mild reaction conditions. The process mediated by the phosphazene base (P2)/alcohol at 25 °C exhibits high activity and living behavior, as evidenced by narrow molecular weight distributions (1.05–1.29) and switch on–off chain extension experiments. The nucleophilic attack of epoxides by selenol anions is the rate-determining step according to kinetic studies. The resultant Se-containing polyesters possess >99% alternating degree, >99% regioregularity, and programmable hydroxyl terminals. More importantly, these poly(selenide-alt-ester)s exhibit the initial thermal decomposition temperatures of up to 275 °C, low glass-transition temperatures of down to −59 °C, excellent solvability in common organic solvents, high refractive indexes (1.61–1.62), and good ionic conductivity (when doped with Li salt, 1.09 × 10–6 S/cm at 30 °C, 1.73 × 10–4 S/cm at 100 °C), indicating potential broad application prospects of these Se-rich polyesters.
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