压力衰减法测定CO_2在固态聚对苯二甲酸乙二醇酯中的溶解度

Solubility of CO_2 in Solid State PET by Pressure-Decay Method

利用压力衰减法测定了CO2在固态聚对苯二甲酸乙二醇酯(PET)中的溶解度。通过差示扫描量热仪(DSC)研究了经CO2溶解后固态PET结晶度的变化并计算了CO2在固态PET非晶区中的溶解度。结果表明:同一温度下CO2的溶解度随着压力的升高逐渐增加,且在低压下(约<8 MPa)溶解度和压力几乎成线性关系,符合亨利定律。而在同一压力下,温度对溶解度的影响不是很大,低压时不同温度下的溶解度几乎相同,高压下温度越高溶解度反而越小。采用Sanchez-Lacombe状态方程关联预测了373.15 K3、98.15 K和423.15 K下的CO2在固态PET非晶区中的溶解度数据,最大关联误差为6.69%。

Solubility of CO2 in solid state PET was measured by pressure-decay method. In order to calculate solubility of CO2 in amorphous region of PET, the crystallinity of solid state PET dissolved by CO2 at different pressures and temperatures was investigated by differential scanning calorimetry （DSC）. The solubility increases with pressure, and when the pressure is below 8 MPa it follows the linear relationship and meets the Henry＇s law. The effect of temperature on solubility is weak and the data of solubility at different temperatures are almost the same at low pressures while at high pressures the solubility decreases with an increase in temperature. The solubility of CO2 in amorphous region of PET at 373.15 K, 398, 15 K and 423, 15 K was correlated with the SanchezLacombe equation of state with a max correlation error of 6.69 %.