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Desorptionof Carbon Dioxidein Supercritical CO2-Swollen Polymers
Ye Shuji,Chen Mingcai,Jiang Ming,Fu Yilu
Author NameAffiliation
Ye Shuji 中科院广州化学研究所广州 510650 
Chen Mingcai 中科院广州化学研究所广州 510650 
Jiang Ming 中国科学技术大学化学物理系合肥 230026 
Fu Yilu 中国科学技术大学化学物理系合肥 230026 
Abstract:
A study was undertaken to investigate the desorption of CO2 in the six polymers,namely,LDPE,PP,PA6,EVA,PS and PU.The six polymers were treated in supercritical CO2.The temperature of supercritical CO2 was 40℃,pressure was from 8.0 to 14.0MPa.The weight change of polymers after treatment was fitted with two functions.One function was Y=Y0+Aexp{-(t-t0)/τ},the other was Y=Y0+A(t-t0)1/2.The result indicated that the weight change of polymers after treatment in mass with time showed a dependence on the logarithm of time.The desorption equation of CO2 in polymers was given in accordance with Fickian diffusion law.The diffusion coefficient of CO2 was calculated with the desorption equation.The result suggested that the diffusion coefficient of CO2 was about 10-7cm2/s and it depended on the amount of CO2 in polymer,temperature and the treated pressure.
Key words:  Supercritical carbon dioxide,Desorption,Desorption equation,Diffusion coefficient
FundProject:国家自然科学基金资助项目(29674035)
二氧化碳从它溶胀后的聚合物中的解吸
叶树集,陈鸣才,姜明,伏义路
摘要:
研究了经过40℃,8.0~14.0MPa的超临界二氧化碳溶胀后的6种聚合物LDPE、PP、PA6、EVA、PS和PU中的CO2解吸情况,模拟了聚合物中CO2的解吸规律,即以时间的自然指数递减规律,并根据Fick扩散定理从理论上推导出CO2在聚合物中的解吸方程,由解吸方程计算解吸扩散系数,结果表明CO2的解吸扩散系数数量级达10-7cm2/s,解吸扩散系数与CO2在聚合物中的浓度和温度以及解吸前聚合物在超临界二氧化碳中的压力有关。
关键词:  超临界二氧化碳  解吸  解吸方程  扩散系数
DOI:10.1088/1674-0068/13/1/113-117
分类号: