扩散
解吸
吸附
重量分析
有效扩散系数
热力学
材料科学
甲基丙烯酸甲酯
菲克扩散定律
气体扩散
分析化学(期刊)
大气温度范围
聚合物
化学
色谱法
物理化学
有机化学
吸附
复合材料
放射科
磁共振成像
物理
单体
医学
电极
作者
Jaehoo Kim,Kwan Kim,Youngjae Ryu,Sung Woon Cha
出处
期刊:Polymers
[MDPI AG]
日期:2022-02-01
卷期号:14 (3): 596-596
被引量:1
标识
DOI:10.3390/polym14030596
摘要
Several researchers have investigated the phenomenon of polymer-gas mixtures, and a few have proposed diffusion coefficient values instead of a diffusion coefficient model. There is a paucity of studies focused on the continuous change in the diffusion coefficient corresponding to the overall pressure and temperature range of the mixture. In this study, the gas sorption and desorption experiments of poly(methyl methacrylate) (PMMA) were conducted via solid-state batch foaming, and the weight change was measured using the gravimetric method with a magnetic balance. The control parameters were temperature, which ranged from 290 to 370 K, and pressure, which ranged from 2 to 5 MPa in the subcritical regime. Based on the experimental data, the diffusion coefficient of the PMMA was calculated using Fick's law. After calculating the diffusion coefficient in the range of the experiment, the diffusion coefficient model was employed using the least-squares method. Subsequently, the model was validated by comparing the obtained results with those in the literature, and the overall trend was found to be consistent. Therefore, it was confirmed that there were slight differences between the diffusion coefficient obtained using only Fick's equation and the value using by a different method.
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