温敏聚合物分子结构对其溶液特性的影响

Effect of Molecular Structure of Thermosensitive Polymer on Its Solution Property

程仲富 潘丽娟 李 亮 温建泰 陈晋东 ALAIN Pierre Tchameni

CHENG Zhongfu PAN Lijuan LI Liang WEN Jiantai CHEN Jindong ALAIN Pierre Tchameni

为了研究温敏聚合物分子结构对其水溶液特性的影响，以自制的温敏大单体聚（丙烯酰胺-co-N，N-二乙基 丙烯酰胺）［poly（AM-co-DEAM），PADA］、2-丙烯酰胺基-2-甲基丙磺酸（AMPS）和 N，N-亚甲基双丙烯酰胺 （MBA）等单体为原料，采用自由基聚合法制备了接枝率和相对分子质量不同的温敏聚合物（CGPADA）。采用 红外光谱仪、元素分析仪、流变仪、可见分光光度计等仪器，研究了 CGPADA 的分子结构、外加盐类型等对 CGPADA 溶液温敏增稠性能的影响。结果表明，只有当温敏大单体 PADA 中 DEAM 含量处于一定范围时， CGPADA才会呈现出优良的温敏增稠性；在此范围内，DEAM含量越高、分子量越低，CGPADA溶液的临界缔合 温度和浊点越低，温敏增稠现象越显著；与Na+相比，Ca2+ 对PADA侧链疏水缔合的促进作用更强，使得聚合物溶 液的温敏增稠现象更加显著。盐致增稠效应与 CGPADA 的分子结构、盐加量以及溶液中阳离子的电荷数等 因素有关。

In order to study the influence of molecular structure of thermosensitive polymer on the characteristic of its aqueous solution，using the thermosensitive macromonomer poly（acrylamide-co-N，N-diethylacrylamide）［poly（AM-co-DEAM）， PADA］，2-acrylamide-2-methylpropyl sulfonic acid（AMPS），N，N-methylene diacrylamide（MBA）and other monomers as raw materials，thermosensitive polymers（CGPADA）with different grafting rate and molecular weight were prepared by free radical polymerization method. The effects of the molecular structure of CGPADA and the type of added salt on the thermo-thickening properties of CGPADA solution were studied by infrared spectrometer，element analyzer，rheometer and visible spectrophotometer. The results showed that only when the content of DEAM in the thermosensitive macromonomer PADA was within a certain range， CGPADA showed excellent thermo-thickening. In this range，the higher the content of DEAM and the lower the molecular weight， the lower the critical association temperature and turbidity point of CGPADA solution and the more significant the thermo-thickening phenomenon were. Compared with Na+ ，Ca2+ promoted the hydrophobic association of PADA side chain more strongly，which made the thermo-thickening of polymer solution more significantly. The salt-induced thickening effect was related to the molecular structure of CGPADA，the dosage of salt and the charge number of cations in solution.

10.19346/j.cnki.1000-4092.2023.02.022