Precise fabrication of porous polymer frameworks using rigid polyisocyanides as building blocks: from structural regulation to efficient iodine capture.
Precise fabrication of porous polymer frameworks using rigid polyisocyanides as building blocks: from structural regulation to efficient iodine capture.
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使用刚性多异氰化物作为构件精确制造多孔聚合物框架：从结构调节到有效的碘捕获
DOI：
10.1039/d1sc05361b
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发表时间：
2022-01-26
期刊：
影响因子：
8.4
通讯作者：
Wu ZQ
中科院分区：
文献类型：
--
作者：
Xu XH;Li YX;Zhou L;Liu N;Wu ZQ
多孔材料由于其令人着迷的结构和广泛的应用而近年来引起了人们的广泛关注。此外，探索能够有效捕获碘的新型多孔聚合物也具有重要意义。与报道的用小分子嵌段制造的多孔聚合物相反，我们在此报道了使用刚性多异氰化物作为结构单元制备多孔聚合物框架。首先合成了具有可预测分子量、低分散性的四面体四臂星形多异氰化物；然后，刚性多异氰化物嵌段的链端进行交联，产生具有设计的孔径和窄分布的明确的多孔有机框架。观察到适当孔径的聚合物能够有效捕获水相和气相中的放射性碘。 1分钟内可以从饱和水溶液中捕获超过98%的碘（容量高达3.2 g g−1），并且在4小时内测得蒸气中碘的吸附容量高达574 wt%。此外，这些聚合物可以回收并再循环用于捕获碘至少六次，同时保持高性能。
Porous materials have recently attracted much attention owing to their fascinating structures and broad applications. Moreover, exploring novel porous polymers affording the efficient capture of iodine is of significant interest. In contrast to the reported porous polymers fabricated with small molecular blocks, we herein report the preparation of porous polymer frameworks using rigid polyisocyanides as building blocks. First, tetrahedral four-arm star polyisocyanides with predictable molecular weight and low dispersity were synthesized; the chain-ends of the rigid polyisocyanide blocks were then crosslinked, yielding well-defined porous organic frameworks with a designed pore size and narrow distribution. Polymers of appropriate pore size were observed to efficiently capture radioactive iodine in both aqueous and vapor phases. More than 98% of iodine could be captured within 1 minute from a saturated aqueous solution (capacity of up to 3.2 g g−1), and an adsorption capacity of up to 574 wt% of iodine in vapor was measured within 4 hours. Moreover, the polymers could be recovered and recycled for iodine capture for at least six times, while maintaining high performance.
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