A New Family of Thermo-, pH-, and CO2-Responsive Homopolymers of Poly[Oligo(ethylene glycol) (N-dialkylamino) methacrylate]s,Macromolecules

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A New Family of Thermo-, pH-, and CO2-Responsive Homopolymers of Poly[Oligo(ethylene glycol) (N-dialkylamino) methacrylate]s
Macromolecules ( IF 5.1 ) Pub Date : 2017-06-09 00:00:00 , DOI: 10.1021/acs.macromol.7b00763
Ke Wang ₁ , Shengli Chen ₁ , Wangqing Zhang _{1,

2}

Affiliation

A new family of thermo-, pH-, and CO₂-responsive homopolymers of poly[oligo(ethylene glycol)(N-dialkylamino)methacrylate]s combining the pendants of oligo ethylene glycol (OEG) moiety and dialkylamine are synthesized by RAFT polymerization. In these poly[oligo(ethylene glycol) (N-dialkylamino) methacrylate]s, the OEG moiety as well as the dialkylamine group affords thermoresponse, and the dialkylamine group affords pH-, and CO₂-response. The phase transition temperature (CP) of poly[oligo(ethylene glycol) (N-dialkylamino) methacrylate]s is firmly correlative to the number of the OEG moiety and the dialkylamine group, and it is found that higher number of the OEG moiety and higher CP, and the longer dialkylamine group and the lower CP, respectively. By tuning the OEG moiety and the dialkylamine group, eight thermo-, pH-, and CO₂-responsive homopolymers with CPs ranging from 7 to 79 °C are synthesized. The thermoresponsive phase transition of poly[oligo(ethylene glycol) (N-dialkylamino) methacrylate]s is investigated by temperature-variable ¹H NMR analysis, and the parameters affecting thermoresponsive phase transition of poly[oligo(ethylene glycol) (N-dialkylamino) methacrylate]s including polymerization degree, polymer concentration, terminals attached to the polymer backbone, salt, and urea are investigated. Multithermoresponsive diblock copolymer and triblock copolymer exhibiting two and three CPs are synthesized, and their versatile micellization upon temperature changing is demonstrated.

中文翻译：

聚[低聚（乙二醇）（N-二烷基氨基）甲基丙烯酸酯]的热，pH和CO ₂响应均聚物的新家族

通过RAFT聚合反应合成了低聚乙二醇（OEG）部分的侧链与二烷基胺相结合的聚[低聚（乙二醇）（N-二烷基氨基）甲基丙烯酸]的热，pH和CO ₂响应均聚物的新家族。在这些聚[低聚（乙二醇）（N-二烷基氨基）甲基丙烯酸酯]中，OEG部分以及二烷基胺基团提供热响应，而二烷基胺基团提供pH和CO _2-响应。聚[低聚（乙二醇）（N[-二烷基氨基）甲基丙烯酸酯与OEG部分的数目和二烷基胺基团牢固地相关，并且发现，OEG部分的数目较高和CP较高，并且二烷基胺基团较长和CP较低。通过调节OEG部分和二烷基胺基团，合成了CP范围为7至79°C的8种对温度，pH和CO ₂响应的均聚物。通过温度可变的¹ H NMR分析研究了聚[低聚（乙二醇）（N-二烷基氨基）甲基丙烯酸] s的热响应相变，以及影响聚[低聚（乙二醇）（N研究了包括聚合度，聚合物浓度，连接到聚合物主链的末端，盐和尿素在内的[-二烷基氨基）甲基丙烯酸酯。合成了具有两个和三个CP的多热敏性二嵌段共聚物和三嵌段共聚物，并证明了它们在温度变化下的通用胶束化作用。

更新日期：2017-06-09

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