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聚（N-异丙基丙烯酰胺）水溶液中，弹簧熵效应的定量测定及其对不同浓度下聚合物线团构象变化的指示

Quantitative determination of the spring entropy effect and its indication of the conformational change of polymer coils with varying concentration in aqueous poly(-isopropylamide) solutions.

作者信息

Song Li, Lin Jiaxiang, Liu Panpan, Li Jingqing, Jiang Shichun, Huang Dinghai

机构信息

Department of Polymer Material Science and Engineering, Institution of Advanced Polymer Materials, School of Material Science and Engineering Tianjin University Tianjin 300350 China

出版信息

RSC Adv. 2019 Feb 14;9(10):5540-5549. doi: 10.1039/c9ra00117d. eCollection 2019 Feb 11.

DOI:10.1039/c9ra00117d
PMID:35515908
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9060781/
Abstract

The lower critical solution temperature (LCST) phase separation behaviors of thermosensitive poly(-isopropylacrylamide) (PNIPAM) aqueous solutions were investigated by power-compensation differential scanning calorimetry (DSC). The entropic effect and hence the change of swelling state of PNIPAM polymer coils in homogeneous concentrated aqueous solutions with varied solution composition was elucidated by the isothermal enthalpy demixing recovery behaviors in distinct concentration regions.

摘要

采用功率补偿差示扫描量热法（DSC）研究了热敏性聚（N-异丙基丙烯酰胺）（PNIPAM）水溶液的低临界溶液温度（LCST）相分离行为。通过不同浓度区域的等温焓解混恢复行为，阐明了熵效应以及因此在不同溶液组成的均相浓水溶液中PNIPAM聚合物线圈溶胀状态的变化。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c7f6/9060781/d6c872113d4f/c9ra00117d-f8.jpg
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