低临界溶液温度
聚(N-异丙基丙烯酰胺)
回转半径
聚合物
材料科学
离子强度
小角X射线散射
高分子化学
化学工程
吸附
共聚物
水溶液
散射
化学
物理化学
复合材料
光学
物理
工程类
作者
Bence Fehér,Imre Varga,Jan Skov Pedersen
出处
期刊:Soft Materials
[Informa]
日期:2021-09-16
卷期号:20 (sup1): S10-S18
被引量:1
标识
DOI:10.1080/1539445x.2021.1979041
摘要
Thermoresponsive polymers, with special emphasis on poly(N-isopropylacrylamide) (PNIPAAM) have been the focus of several investigations due to its potential applications in many fields of physical and polymer chemistry. PNIPAAM has a “lower critical solution temperature” at 32°C. The LCST can be finely tuned by copolymerization with hydrophobic or hydrophilic comonomers, and with a change of physical chemical parameters, such as ionic strength of the solution. We investigated the effect of polymer concentration on the LCST in two different solution environment, in pure water and in 50 mM NaCl solution with small-angle X-ray scattering (SAXS) of relatively low molecular mass polymers. We showed that the radius of gyration of the pNIPAAM chains increases with the addition of NaCl to the system due to the low level of specific adsorption of chloride ions on the polymer, whilst increasing the temperature causes a shrinkage of the polymer chains. Furthermore, by increasing the temperature the attractive interaction between the individual polymer chains is enhanced which turns into aggregation at the LCST.
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