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采用高压视窗釜配合高清晰相机研究了聚甲基丙烯酸甲酯(PMMA)在超临界二氧化碳(scCO2)中溶胀行为,得到了PMMA在scCO2中的平衡溶胀率。Sanchez-Lacombe(S-L)状态方程对于高压气体和聚合物系统的热力学性质有着很强的预测能力。将PMMA的PVT数据使用S-L状态方程进行拟合,得到压力、温度和密度的特征参数分别为:212.38MPa、898.04K以及1206.7kg·m-3(8～25MPa,305～350K),类似地可以得到二氧化碳(CO2)的特征参数541.56MPa、313.38K以及1502.1kg·m-3(8～25MPa,305～325K)。将实验得到的PMMA平衡溶胀率使用S-L状态方程拟合,可得二元相互作用参数为1.0671,结果表明在超临界区域,S-L状态方程模拟溶胀率与实验值吻合较好。
The swelling behavior of polymethylmethacrylate (PMMA) in supercritical carbon dioxide (scCO2) was studied by using high-pressure window autoclave combined with high-definition camera. The equilibrium swelling rate of PMMA in scCO2 was obtained. The Sanchez-Lacombe (S-L) equation of state has strong predictive power for the thermodynamic properties of high-pressure gas and polymer systems. The PVT data of PMMA were fitted by SL equation of state, and the characteristic parameters of pressure, temperature and density were 212.38MPa, 898.04K and 1206.7kg · m-3 respectively (8 ~ 25MPa, 305 ~ 350K) The characteristic parameters of carbon dioxide (CO2) were 541.56MPa, 313.38K and 1502.1kg · m-3 (8 ~ 25MPa, 305 ~ 325K). The experimentally obtained equilibrium swelling rate of PMMA was fitted by S-L equation of state, and the binary interaction parameter was 1.0671. The results showed that the S-L equation of state simulated swelling rate was in good agreement with the experimental data in the supercritical region.