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首页> 外文期刊>ACS Macro Letters >pH-Tunable Thermoresponsive PEO-Based Functional Polymers with Pendant Amine Groups
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pH-Tunable Thermoresponsive PEO-Based Functional Polymers with Pendant Amine Groups

机译：具有悬垂胺基团的pH可调的热响应性PEO基功能聚合物

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摘要

Thermoresponsive polymers exhibiting lower critical solution temperatures (LCSTs) in aqueous solution have garnered considerable attention for the development of smart materials. Herein, we report the synthesis and properties of pH-tunable thermoresponsive poly(ethylene oxide) (PEO)-based functional polymers bearing pendant amine groups with varying cloud points. Well-defined poly(ethylene oxide-co-allyl glycidyl ether) (P(EO-co-AGE)) copolymers were prepared via controlled anionic ring-opening copolymerization of ethylene oxide (EO) with 10 mol % of a functional allyl glycidyl ether (AGE) comonomer. Facile, modular thiol-ene click chemistry was then employed to introduce a library of different aminothiols as side chains to the initial P(EO-co-AGE) copolymer. Depending on the nature of the pendant amine groups (primary amine, dimethylamine, and diethylamine) and the hydrophobicity of the side chains (ethyl, propyl, and hexyl), the cloud points could be tuned from 44-100 degrees C under different pH conditions. This is the first systematic investigation into the effect of PEO copolymer side chains on cloud point, which opens up the opportunity to make new thermoresponsive polymers for a variety of smart material applications.
机译：在水溶液中具有较低临界溶液温度（LCST）的热敏性聚合物已为智能材料的开发引起了广泛关注。在这里，我们报告的pH可调热响应聚（环氧乙烷）（PEO）为基础的功能性聚合物，带有变化的浊点的侧基胺基。通过将环氧乙烷（EO）与10 mol％的功能性烯丙基缩水甘油醚进行受控的阴离子开环共聚反应，制得定义明确的聚环氧乙烷-烯丙基缩水甘油醚（P（EO-co-AGE））共聚物（AGE）共聚单体。然后采用简单的模块化硫醇-烯点击化学方法将不同氨基硫醇的文库作为侧链引入到初始P（EO-co-AGE）共聚物中。根据侧基胺基（伯胺，二甲胺和二乙胺）的性质和侧链的疏水性（乙基，丙基和己基），可以在不同的pH条件下从44-100摄氏度调节浊点。这是对PEO共聚物侧链对浊点影响的首次系统研究，这为制造适用于各种智能材料应用的新型热敏聚合物提供了机会。

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