聚(N-异丙基丙烯酰胺)
水溶液
小角X射线散射
动态光散射
温度跃变
散射
相(物质)
低临界溶液温度
胶体
相图
光散射
化学
静态光散射
浊度
分析化学(期刊)
材料科学
热力学
色谱法
光学
聚合物
纳米技术
物理化学
纳米颗粒
物理
有机化学
地质学
海洋学
共聚物
作者
Jiayun Han,Rintaro Takahashi,Kuang Chen,Takahiro Sato
出处
期刊:Langmuir
[American Chemical Society]
日期:2021-09-23
卷期号:38 (17): 5089-5097
被引量:8
标识
DOI:10.1021/acs.langmuir.1c01917
摘要
We have investigated the colloidal phase-separating dilute solution of aqueous poly(N-isopropylacrylamide) (PNIPAM) with a molecular weight of 1.24 × 105 by small-angle X-ray scattering (SAXS) as well as static and dynamic light scattering (SLS and DLS). Those scattering experiments provide us with the average size and size distribution of concentrated-phase droplets and the concentration cconc of the coexisting concentrated phase. While the average droplet size is almost constant above 35 °C in the temperature-scan experiments, it is a decreasing function of temperature above 35 °C in the temperature-jump experiments. This heating rate dependence of the average droplet size arises from the fact that concentrated-phase droplets in the aqueous PNIPAM solution grow only in a limited temperature range (31.5-35 °C). The scattering results on the temperature dependence of cconc are combined with previously reported results of turbidity and DSC, giving the phase diagram of the Type II phase behavior with the off-zero critical point at high molecular weight.
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