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题名: Synthesis, Thermal Properties, and Thermoresponsive Behaviors of Cyclic Poly(2-(dimethylamino)ethyl Methacrylate)s
作者: An, Xiaonan1; Tang, Qingquan2; Zhu, Wen2; Zhang, Ke2; Zhao, Youliang1
关键词: cyclic polymers ; Diels-Alder reactions ; phase transitions ; smart polymers ; thermal properties
刊名: MACROMOLECULAR RAPID COMMUNICATIONS
发表日期: 2016-06-01
卷: 37, 期:12, 页:980-986
收录类别: SCI
英文摘要: This study aims at physicochemical properties of thermo-and pH/CO2-responsive cyclic homopolymers. Three examples of cyclic poly(2-(dimethylamino)ethyl methacrylate)s (PDMAs) are synthesized by combining the reversible addition-fragmentation chain transfer process and the Diels-Alder ring-closure reaction. After cyclization, the glass transition temperature significantly increases (Delta T-g = 51.8-59.7 degrees C) due to the different configurational entropy and end groups, and the maximum decomposition temperature to lose the pendent groups is drastically decreased from 309 to 278 degrees C. Effects of polymerization degree, polymer concentration, additive of NaCl, and pH/CO2 on lower critical solution temperature behaviors of PDMA aqueous solutions are investigated. The cloud points (T-c) of ring PDMAs are usually higher than their linear precursors, and the Delta T-c values obtained under a fixed condition can reach up to 20.7 degrees C, revealing the crucial role of the topology effect. This study paves the way for unique properties and applications of smart cyclic polymers and their derivatives.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35186
Appears in Collections:高分子物理与化学实验室_期刊论文

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作者单位: 1.Soochow Univ, Suzhou Key Lab Macromol Design & Precis Synth, State & Local Joint Engn Lab Novel Funct Polymer, Coll Chem Chem Engn & Mat Sci,Jiangsu Key Lab Adv, Suzhou 215123, Peoples R China
2.Chinese Acad Sci, Inst Chem, State Key Lab Polymer Phys & Chem, Beijing 100190, Peoples R China
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