论文标题
使用“ sl-ts2”平均场进近的几种聚合物和低分子量有机玻璃形式的压力体积 - 温度和介电松弛的综合描述
Combined Description of Pressure-Volume-Temperature and Dielectric Relaxation of Several Polymeric and Low-Molecular-Weight Organic Glass-Formers using 'SL-TS2' Mean-Field Approach
论文作者
论文摘要
我们应用了最近发达的平均场“ SL-TS2”（两态sanchez-lacombe）模型，同时描述四个聚合物（聚苯乙烯，聚（甲基甲基甲基酯），聚甲基乙基乙基乙基乙基酯（甲基甲基酯）中的四个聚合物中的介电α-纤维 - 纤维 - 纤维 - 透明度（PVT）数据（PVT）数据（PVT）数据分子玻璃板（Ortho-Terphenyl，甘油，PCB-62和PDE）。以前，已经表明，对于所有八种材料，Casalini-Roland热力学缩放缩放，/tau _ {/alpha} = f（tv_ {sp}^{/gamma}）（t是温度和v_ {sp {sp}是特定的体积），（casalini，roland，r.; roland，roland，C。M. rev. 2014，85（85），85（85）（85）（85）， 使满意。先前还显示出同一缩放在“ SL-TS2”框架内自然出现（对于足够低的压力）（Ginzburg，V。V. Soft Matter 2021，17，9094）。在这里，我们符合八种材料的温度功能，适合环境压力曲线，并在理论和实验之间观察到良好的一致性。然后，我们使用Casalini-Roland缩放量表将这些结果转换为“主曲线”，从而可以预测放松时间和在高压处的特定体积。所提出的方法可用于描述其他低分子量和聚合物的其他玻璃形成材料。
We apply our recently-developed mean-field 'SL-TS2' (two-state Sanchez-Lacombe) model to simultaneously describe dielectric alpha-relaxation time and pressure-volume-temperature (PVT) data in four polymers (polystyrene, poly(methylmethacrylate), poly(vinyl acetate) and poly(cyclohexane methyl acrylate)) and four organic molecular glass formers (ortho-terphenyl, glycerol, PCB-62, and PDE). Previously, it has been shown that for all eight materials, the Casalini-Roland thermodynamical scaling, /tau_{/alpha} = f(TV_{sp}^{/gamma}) (where T is temperature and V_{sp} is specific volume), (Casalini, R.; Roland, C. M. Phys. Rev. Lett. 2014, 113 (8), 85701), is satisfied. It has also been previously shown that the same scaling emerges naturally (for sufficiently low pressures) within the 'SL-TS2' framework (Ginzburg, V. V. Soft Matter 2021, 17, 9094). Here, we fit the ambient pressure curves for the relaxation time and the specific volume as functions of temperature for the eight materials and observe a good agreement between theory and experiment. We then use the Casalini-Roland scaling to convert those results into 'master curves', thus enabling predictions of relaxation times and specific volumes at elevated pressures. The proposed approach can be used to describe other glass-forming materials, both low-molecular-weight and polymeric.
