三氟甲基
含氟聚合物
亚甲基
聚合物
聚合
光化学
化学
卡宾
材料科学
高分子化学
催化作用
有机化学
烷基
作者
Xunhui Xu,Shu‐Ming Kang,Run‐Tan Gao,Zheng Chen,Na Liu,Zong‐Quan Wu
标识
DOI:10.1002/anie.202300882
摘要
Abstract Developing high performance and environment‐friendly fluoropolymers is greatly desired. In this work, we found that 2‐diazo‐1,1,1‐trifluoroethane can be polymerized by air‐stable alkyne‐palladium(II) catalysts following a living polymerization mechanism, affording a fluoropolymer, poly(trifluoromethyl methylene) in high yield with controlled molar mass and low dispersity. This polymer bears trifluoromethyl on every main chain atom and thus has good resistance to chemical corrosion, high hydrophobicity, and excellent dielectric constant with low dielectric loss. Due to the steric hindrance between the trifluoromethyl pendants, the synthetic poly(trifluoromethyl methylene) can twist into a stable helix. The one‐handed preferred helices synthesized using chiral Pd II ‐catalysts exhibit high optical activity and circularly polarized luminescence. Remarkably, such polymer can be completely degraded to ( E )‐1,1,1,4,4,4‐hexafluorobut‐2‐ene at high temperatures (>280 °C). Additionally, taking advantage of the living chain end, the polymer can be further modified.
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