A library of thermoresponsive PEG‐based methacrylate homopolymers: How do the molar mass and number of ethylene glycol groups affect the cloud point?,Journal of Polymer Science

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A library of thermoresponsive PEG‐based methacrylate homopolymers: How do the molar mass and number of ethylene glycol groups affect the cloud point?
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2020-12-28 , DOI: 10.1002/pol.20200720
Qian Li ₁ , Anna P. Constantinou ₁ , Theoni K. Georgiou ₁

Affiliation

In this study, a novel library of thermoresponsive homopolymers based on poly (ethylene glycol) (EG) (m)ethyl ether methacrylate monomers is presented. Twenty‐seven EG based homopolymers were synthesized and three parameters, the molar mass (MM), the number of the ethylene glycol groups in the monomer, and the chemistry of the functional side group were varied to investigate how these affect their thermoresponsive behavior. The targeted MMs of these polymers are varied from 2560, 5000, 8200 to 12,000 g mol⁻¹. Seven PEG‐based monomers were investigated: ethylene glycol methyl ether methacrylate (MEGMA), ethylene glycol ethyl ether methacrylate (EEGMA), di(ethylene glycol) methyl ether methacrylate (DEGMA), tri(ethylene glycol) methyl ether methacrylate (TEGMA), tri(ethylene glycol) ethyl ether methacrylate (TEGEMA), penta(ethylene glycol) methyl ether methacrylate (PEGMA), nona(ethylene glycol) methyl ether methacrylate (NEGMA). Homopolymers of 2‐(dimethylamino) ethyl methacrylate (DMAEMA) were also synthesized for comparison. The cloud points of these homopolymers were tested in different solvents and it was observed that it decreases as the number of EG group was decreased or the MM increased. Interestingly, the end functional group (methoxy or ethoxy) of the side group has an effect as well and is even more dominant than the number of EG groups.

中文翻译：

基于热敏性PEG的甲基丙烯酸甲酯均聚物库：乙二醇基团的摩尔质量和数量如何影响浊点？

在这项研究中，提出了一个新的基于聚（乙二醇）（EG）（m）乙基甲基丙烯酸甲酯单体的热敏均聚物库。合成了27种基于EG的均聚物，并改变了三个参数：摩尔质量（MM），单体中的乙二醇基团数和官能侧基的化学性质，以研究这些参数如何影响其热响应性。这些聚合物的目标MM为2560、5000、8200至12,000 g mol ^-1。研究了七种基于PEG的单体：乙二醇甲基甲基丙烯酸甲酯（MEGMA），乙二醇甲基丙烯酸乙基醚（EEGMA），甲基丙烯酸二（乙二醇）甲基醚（DEGMA），甲基丙烯酸三乙二醇酯（TEGMA），三（乙二醇）乙基甲基丙烯酸甲酯（TEGEMA），五（乙二醇）甲基丙烯酸甲基醚（PEGMA），九烷基（乙二醇）甲基丙烯酸甲基醚（NEGMA）。还合成了甲基丙烯酸2-（二甲氨基）乙酯（DMAEMA）的均聚物进行比较。在不同溶剂中测试了这些均聚物的浊点，并且观察到其随着EG基团数量的减少或MM的增加而降低。有趣的是，侧基的末端官能团（甲氧基或乙氧基）也具有作用，并且甚至比EG基团的数目更占优势。

更新日期：2021-02-01

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