PSSS50-b-PNIPAM300嵌段共聚物在二元溶剂中自组装的NMR研究

赵智慧; 刘表兰; 闫小双; 武帅帅; 茹阁英; 毛诗珍; 冯继文

doi:10.11938/cjmr20192736

波谱学杂志 >

2019 , Vol. 36 >Issue 4: 502 - 509

DOI: https://doi.org/10.11938/cjmr20192736

研究论文

PSSS₅₀-b-PNIPAM₃₀₀嵌段共聚物在二元溶剂中自组装的NMR研究

赵智慧 ,
刘表兰 ,
闫小双 ,
武帅帅 ,
茹阁英 ,
毛诗珍 ,
冯继文

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1. 波谱与原子分子物理国家重点实验室, 武汉磁共振中心(中国科学院武汉物理与数学研究所), 湖北武汉 430071;
2. 中国科学院大学, 北京 100049

收稿日期: 2019-04-12

网络出版日期: 2019-05-30

基金资助

国家自然科学基金资助项目（21803076）.

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Thermally Triggered Self-Assembly of PSSS₅₀-b-PNIPAM₃₀₀ in Binary Solvent Studied by NMR Spectroscopy

ZHAO Zhi-hui ,
LIU Biao-lan ,
YAN Xiao-shuang ,
WU Shuai-shuai ,
RU Ge-ying ,
MAO Shi-zhen ,
Feng Ji-wen

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1. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan(Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences), Wuhan 430071, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2019-04-12

Online published: 2019-05-30

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摘要

本文结合核磁共振（NMR）、动态光散射（DLS）和透射电子显微镜（TEM）等表征方法，对自主合成的聚阴离子型温敏嵌段共聚物—聚（苯乙烯磺酸钠）-b-聚（N-异丙基丙烯酰胺）（PSSS₅₀-b-PNIPAM₃₀₀）在纯水、水/甲醇以及水/丙酮三种溶剂中的温度响应性和自组装行为进行了系统研究.结果发现PNIPAM链段在水/丙酮以及水/甲醇二元溶剂中的临界溶解温度（LCST）比在纯水溶液中略低，而在水/丙酮体系中的塌缩程度却明显低于纯水和水/甲醇体系.同时，PSSS₅₀-b-PNIPAM₃₀₀在不同溶剂体系中的聚集形貌也存在显著差异，表明加入有机溶剂小分子可以有效地调控温敏嵌段共聚物在水溶液中的自组装过程和聚集形貌.

关键词： 核磁共振(NMR); 自组装; 嵌段共聚物; 二元溶剂; 温度响应性

本文引用格式

赵智慧 , 刘表兰 , 闫小双 , 武帅帅 , 茹阁英 , 毛诗珍 , 冯继文 . PSSS₅₀-b-PNIPAM₃₀₀嵌段共聚物在二元溶剂中自组装的NMR研究[J]. 波谱学杂志, 2019 , 36(4) : 502 -509 . DOI: 10.11938/cjmr20192736

Abstract

Thermo-responsiveness and self-assembly behaviors of poly(sodium-p-styrene sulfonate)-block-poly (N-isopropylacrylamide) (PSSS₅₀-b-PNIPAM₃₀₀) in pure water and binary solvents (i.e., water/methanol and water/acetone) were investigated by ¹H NMR, dynamic light scattering (DLS), and transmission electron microscopy (TEM). It was found that the PNIPAM chains had a lower lowest critical solution temperature (LCST) in the water/methanol and water/acetone binary solvents than in water. Temperature-induced collapse of PNIPAM in water/acetone binary solvent was evidently weaker compared to the collapses in pure water and water/methanol binary solvent. The DLS and TEM results demonstrated that the self-assembly process and morphology of PSSS₅₀-b-PNIPAM₃₀₀ in aqueous solution could be fine-tuned with the addition of small molecule solvent.

Key words： nuclear magnetic resonance (NMR); self-assembly; block copolymer; binary solvent; thermo-sensitivity

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