Concentration and Temperature Dependence of the Interaction Parameter and Correlation Length for Poly(benzyl methacrylate) in Ionic Liquids
Concentration and Temperature Dependence of the Interaction Parameter and Correlation Length for Poly(benzyl methacrylate) in Ionic Liquids
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离子液体中聚甲基丙烯酸苄酯相互作用参数和相关长度的浓度和温度依赖性
DOI：
10.1021/acs.macromol.2c01365
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发表时间：
2022
期刊：
影响因子：
5.5
通讯作者：
Lodge, Timothy P.
中科院分区：
文献类型：
--
作者：
Carrick, Brian R.;Weigand, Steven;Seitzinger, Claire L.;Lodge, Timothy P.
离子液体（ILs）中的聚合物是一类令人着迷的材料，与传统的聚合物溶液相比，它们表现出不同寻常的行为。先前表征聚甲基丙烯酸苄酯(PBnMA)/IL混合物的低临界溶液温度（LCST）相行为的工作表明，即使在高于观察到的相分离边界的温度下，第二维里系数也始终是正的，并且临界组成强烈地向富含聚合物的组成转移。为了更好地理解这些现象，我们利用小角度x射线散射和Ornstein - Zernike分析，确定了PBnMA在四种il（一种吡咯烷基和三种咪唑基）中的相互作用参数和相关长度与温度（25-170℃）、浓度（5-30 wt%）和分子量（32-76 kDa）的关系。相互作用参数随着聚合物体积分数的增加而增加，这与Flory-Huggins理论所预测的浓度无关的行为相反，该理论解释了这些溶液的不寻常相图。PBnMA在1-丁基-1-甲基吡咯吡啶双（三氟甲基磺酰基）亚胺中的半稀释相关长度服从温度-浓度主曲线；然而，在4种il中没有表现出这种普遍行为。此外，随着溶剂质量的恶化，相关长度的浓度依赖性降低。
Polymers in ionic liquids (ILs) are a fascinating class of materials that exhibit unusual behavior in comparison to more traditional polymer solutions. Previous work characterizing the lower critical solution temperature (LCST) phase behavior of poly(benzyl methacrylate) (PBnMA)/IL mixtures demonstrated that the second virial coefficient is consistently positive, even at temperatures above the observed phase separation boundary, and that the critical composition is shifted strongly toward polymer-rich compositions. To better understand these phenomena, small-angle X-ray scattering was utilized along with Ornstein−Zernike analysis to determine the interaction parameter and correlation length of PBnMA in four ILs (one pyrrolidinium-based and three imidazolium-based) as a function of temperature (25–170 °C), concentration (5–30 wt%), and molecular weight (32–76 kDa). The interaction parameter was shown to increase with polymer volume fraction, contrary to the concentration-independent behavior anticipated by Flory-Huggins theory, which clarified the unusual phase diagram of these solutions. The semidilute correlation length of PBnMA in 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide was shown to obey a temperature-concentration master curve; however, no such universal behavior was exhibited among the four ILs. Additionally, the concentration dependence of the correlation length was shown to decrease as the solvent quality worsened.
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聚甲基丙烯酸苄酯在室温离子液体中的相行为和溶剂化结构
DOI：
--
发表时间：
2010
期刊：
影响因子：
--
作者：
K.Fujii;T.Ueki;et. al.
通讯作者：
et. al.
影响因子：
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作者：
Hoarfrost, Megan L.;He, Yanpu;Lodge, Timothy P.
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Lodge, Timothy P.
聚（二甲基硅氧烷）甲乙酮溶液中相互作用参数对分子量和浓度的依赖性
DOI：
--
发表时间：
1982
期刊：
影响因子：
--
作者：
Akihiko Muramoto
通讯作者：
Akihiko Muramoto
影响因子：
5.5
作者：
Kharel, Aakriti;Hall, Cecilia;Lodge, Timothy P.
通讯作者：
Lodge, Timothy P.
影响因子：
3.9
作者：
Ueki, Takeshi;Watanabe, Masayoshi
通讯作者：
Watanabe, Masayoshi