Polymer plasticization using supercritical carbon dioxide: Experiment and modeling

被引:72
作者
Kikic, I
Vecchione, F
Alessi, P
Cortesi, A
Eva, F
Elvassore, N
机构
[1] Univ Trieste, Dept Chem Environm & Raw Mat Engn, I-34127 Trieste, Italy
[2] Univ Padua, Dept Chem Engn, I-35131 Padua, Italy
关键词
D O I
10.1021/ie020961h
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The most important effect of sorption of compressed gases and supercritical fluids into glassy polymers is the reduction of the glass transition temperature (T-g). This plasticization effect causes changes in mechanical and thermophysical properties of the polymers. In this work, a thermodynamic study based on experimental and theoretical results is addressed. New data were carried out for poly(2,6-dimethylphenylene oxide) (PPO), poly(acrylic acid) (PAA), and the copolymer vinylpyrrolidone-vinyl acetate [P(VP-VA)] using an inverse gas chromatographic technique. To model the T-g behavior of diluent-polymer systems, a model that couples the lattice-fluid equation of state and the Gibbs-DiMarzio criterion was used. A parametric study of the influence of the physical properties (lattice coordination number, molecular weight, and binary interaction parameter) on the T-g behavior is presented. The thermodynamic model fairly describes the experimental data measured in this work and gives a phenomenological representation of the retrograde vitrification for the systems PPO-CO2, PVP-CO2, and P(VP-VA)-CO2.
引用
收藏
页码:3022 / 3029
页数:8
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