等温滴定量热法
化学
吉布斯自由能
焓
环氧乙烷
聚合物
滴定法
高分子化学
量热法
氢键
二甲基乙酰胺
二甲基甲酰胺
物理化学
热力学
有机化学
溶剂
分子
共聚物
物理
作者
Caihong Zhang,Weijie Wang,Pengfei Zhang,Yang Shen
出处
期刊:Polymer
[Elsevier]
日期:2022-09-01
卷期号:256: 125196-125196
被引量:1
标识
DOI:10.1016/j.polymer.2022.125196
摘要
Rigorous thermodynamic analysis of polymer complexation is challenging due to the possible kinetically frozen state, complicated chain conformation, and slow chain relaxation. In this work, we study the complexation of poly(acrylic acid) (PAA) with poly(vinylpyrrolidone) (PVPON), poly(2-ethyl-2-oxazoline) (PEOX) and poly(ethylene oxide) (PEO) in acidic water and in organic solvents, including protic solvents (methanol (MeOH), ethanol (EtOH)), and aprotic solvents (N, N-dimethylformamide (DMF), N, N-dimethylacetamide (DMAC), 1-methyl-2-pyrrolidone (NMP), and dimethyl sulfoxide (DMSO)) with isothermal titration calorimetry (ITC). In DMF, complexation of PAA and PVPON has moderate heat releasing and the effect of kinetically frozen structure is negligible, and the ITC data meet the basic standard to be used for analyzing and estimating thermodynamic parameters, and enthalpy, entropy and Gibbs free energy are calculated to be −1.5 kJ/mol, 45 J/(mol⋅K), and −15 kJ/mol respectively. Furthermore, the effects of temperature, chain length contrast, and concentration on the complexation of PAA with PVPON in DMF are studied. The work provides a theoretical method how to evaluate the ITC dada of hydrogen-bonding polymer complexation for thermodynamic analysis and strengthens the understanding of polymer complex.
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