<br>聚(2-(N-烷基丙烯酰胺)乙酸乙酯)的热响应聚合物。,Polymers

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聚(2-(N-烷基丙烯酰胺)乙酸乙酯)的热响应聚合物。
Polymers ( IF 4.7 ) Pub Date : 2020-10-24 , DOI: 10.3390/polym12112464
Xue Liu ₁ , Yuwen Hou ₂ , Yimin Zhang ₁ , Wangqing Zhang ₂

Affiliation

具有不同N-烷基的热响应性聚(2-(N-烷基丙烯酰胺)乙酸乙酯)，包括聚(2-(N-甲基丙烯酰胺)乙酸乙酯)(PNMAAEA)、聚(2-(N-乙基丙烯酰胺)乙酸乙酯)通过溶液RAFT聚合合成聚(N-乙酰氧基乙基丙烯酰胺)(PNEAAAEA)和聚(2-(N-丙基丙烯酰胺)乙酸乙酯)(PNPAAEA)以及聚(N-乙酰氧基乙基丙烯酰胺)(PNAEAA)。出乎意料的是，我们发现这些单体的RAFT聚合存在诱导期，并且诱导时间与单体中N-烷基的长度相关，并且遵循NAEAA < NMAAEA < NEAAEA < NPAAEA 的顺序。聚(2-(N-烷基丙烯酰胺)乙酸乙酯)在水中的溶解度也严格取决于N-烷基的长度。 PNPAAEA 包含最大的 N-丙基，不溶于水，而 PNMAAEA 和 PNEAAEA 在水中具有热响应性，并在临界溶液温度下经历可逆的可溶到不溶转变。热响应性聚合物的浊点温度（Tcp）的顺序为 PNEAAEA < PNAEAA < PNMAAEA。研究了影响热敏聚合物Tcp的参数，例如聚合度(DP)、聚合物浓度、盐、尿素和苯酚。合成了热响应性 PNMAAEA-b-PNEAAEA 嵌段共聚物和具有不同 PNMAAEA 和/或 PNEAAEA 分数的 PNMAAEA-co-PNEAAEA 无规共聚物，并检查了它们的热响应。

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Thermoresponsive Polymers of Poly(2-(N-alkylacrylamide)ethyl acetate)s.

Thermoresponsive poly(2-(N-alkylacrylamide) ethyl acetate)s with different N-alkyl groups, including poly(2-(N-methylacrylamide) ethyl acetate) (PNMAAEA), poly(2-(N-ethylacrylamide) ethyl acetate) (PNEAAEA), and poly(2-(N-propylacrylamide) ethyl acetate) (PNPAAEA), as well as poly(N-acetoxylethylacrylamide) (PNAEAA), were synthesized by solution RAFT polymerization. Unexpectedly, it was found that there are induction periods in the RAFT polymerization of these monomers, and the induction time correlates with the length of the N-alkyl groups in the monomers and follows the order of NAEAA < NMAAEA < NEAAEA < NPAAEA. The solubility of poly(2-(N-alkylacrylamide) ethyl acetate)s in water is also firmly dependent on the length of the N-alkyl groups. PNPAAEA including the largest N-propyl group is insoluble in water, whereas PNMAAEA and PNEAAEA are thermoresponsive in water and undergo the reversible soluble-to-insoluble transition at a critical solution temperature. The cloud point temperature (Tcp) of the thermoresponsive polymers is in the order of PNEAAEA < PNAEAA < PNMAAEA. The parameters affecting the Tcp of thermoresponsive polymers, e.g., degree of polymerization (DP), polymer concentration, salt, urea, and phenol, are investigated. Thermoresponsive PNMAAEA-b-PNEAAEA block copolymer and PNMAAEA-co-PNEAAEA random copolymers with different PNMAAEA and/or PNEAAEA fractions are synthesized, and their thermoresponse is checked.

更新日期：2020-10-24

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