控制超交联嵌段聚合物前体衍生的分级多孔聚合物中的孔隙率,Journal of Polymer Science

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控制超交联嵌段聚合物前体衍生的分级多孔聚合物中的孔隙率
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2018-02-05 , DOI: 10.1002/pola.28966
Soobin Kim ₁ , Myungeun Seo _{1,

2}

Affiliation

我们报告的方法，以控制分级多孔聚合物的含有明确定义的三维连续孔框架微孔孔特性（HPPS），由交联嵌段聚合物的前体聚交酯的超交联反应b -聚（乙烯基苄基氯化物共-苯乙烯-共-二乙烯苯）（PLA- b -P（VBzCl-共-S-共-DVB））组成的双连续PLA和P（VBzCl-的共-S-共-DVB）微区。我们研究了P的超交联反应（VBzCl-共同-S-共-DVB）通过可逆加成-断裂链转移（RAFT）共聚合成，然后检查了聚合混合物中VBzCl，S，DVB和聚丙交酯大链转移剂（PLA-CTA）的含量对聚合物孔隙率的影响HPP。我们证明，虽然负责超交联反应的VBzCl含量主要决定着微孔性，但DVB含量对介孔结构有很大影响，因为它决定了聚合混合物的胶凝作用的开始，从而阻止了新兴的无序双连续形态。由聚合诱导的微相分离过程引起。由于PLA微结构域将渗流介孔空间作为模板，因此介孔率主要受PLA-CTA含量控制。HPP形成中超交联和嵌段聚合物自组装的协同组合提供了高度增强的中孔骨架，对孔塌陷稳定，并且互连了中孔。这些促进了向微孔表面的扩散，表明其可用于高级吸收剂和催化载体。©2018 Wiley Periodicals，Inc.J.Polym。科学，A部分：Polym。化学2018，56，900-913

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Control of porosity in hierarchically porous polymers derived from hyper‐crosslinked block polymer precursors

We report an approach to control the pore characteristics of hierarchically porous polymers (HPPs) containing micropores in a well‐defined 3D continuous mesoporous framework, by the hyper‐crosslinking reaction of a crosslinked block polymer precursor polylactide‐b‐poly(vinylbenzyl chloride‐co‐styrene‐co‐divinylbenzene) (PLA‐b‐P(VBzCl‐co‐S‐co‐DVB)) consisting of bicontinuous PLA and P(VBzCl‐co‐S‐co‐DVB) microdomains. We investigated the hyper‐crosslinking reaction of P(VBzCl‐co‐S‐co‐DVB)s synthesized by reversible addition‐fragmentation chain transfer (RAFT) copolymerization, and then examined the effect of VBzCl, S, DVB, and polylactide macrochain transfer agent (PLA‐CTA) contents in the polymerization mixture on the pore characteristics of the HPPs. We demonstrate that while the VBzCl content responsible for the hyper‐crosslinking reaction primarily governs microporosity, the DVB content has a strong influence on the mesopore structure, as it determines the onset of the gelation of the polymerization mixture, which arrests the emerging disordered bicontinuous morphology induced by the polymerization‐induced microphase separation process. Because the PLA microdomains template the percolating mesoporous space, mesoporosity was mainly controlled by the PLA‐CTA contents. The synergistic combination of hyper‐crosslinking and block polymer self‐assembly in the HPP formation provided a highly reinforced mesoporous framework, stable against pore collapse, and interconnected mesopores. These facilitated diffusion to the microporous surfaces, suggesting its utility for advanced absorbents and catalytic supports. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018, 56, 900–913

更新日期：2018-02-05

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