论文部分内容阅读
采用重力分析法研究了超临界二氧化碳在苯乙烯-丙烯腈聚合物中的溶解与扩散行为,计算出不同工艺条件下CO_2在SAN中的扩散系数。结果表明:吸附过程中,随着饱和温度升高,SAN对CO_2的最大吸附量会减小;随饱和压力增大,SAN对CO_2的最大吸附量会增大;CO_2在SAN中的吸附速率比在PS中的大;解吸附过程中,当CO_2含量低于10.0%时,CO_2在SAN中的解吸附扩散系数随其含量提高而略有增加;当其含量高于10.0%时,由于CO_2的塑化作用,造成其解吸附扩散系数有显著增加;相同条件下,CO_2在SAN树脂中的溶解度比CO_2在PS树脂中的溶解度大,但解吸附过程中,CO_2在SAN中的扩散系数要比在PS中的扩散系数小。
The dissolution and diffusion behavior of supercritical carbon dioxide in styrene-acrylonitrile polymer were studied by gravimetric analysis, and the diffusion coefficient of CO_2 in SAN was calculated under different conditions. The results showed that the maximum amount of CO 2 adsorbed by SAN decreased with the increase of saturation temperature. The maximum adsorption of CO 2 by SAN increased with the increase of saturation pressure. The adsorption rate of CO 2 in SAN In the process of desorption, when the content of CO_2 is less than 10.0%, the desorption and diffusion coefficient of CO_2 in SAN slightly increases with the increase of its content. When the content is higher than 10.0% Plasticization, resulting in a significant increase in desorption and diffusion coefficient; under the same conditions, the solubility of CO 2 in SAN resin is higher than that of CO 2 in PS resin, but in the process of desorption, the diffusion coefficient of CO 2 in SAN is The diffusion coefficient in PS is small.