Temperature dependence of gas sorption and permeation in PIM-1
Temperature dependence of gas sorption and permeation in PIM-1
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DOI：
10.1016/j.memsci.2013.09.030
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发表时间：
2014-01-15
影响因子：
9.5
通讯作者：
Paul, D. R.
中科院分区：
文献类型：
--
作者：
Li, P.;Chung, T. S.;Paul, D. R.
在现有的论文中，在25 ℃下在一定压力范围内测定了PIM-1（一种具有固有微孔性的聚合物）中He、H-2、N-2、O-2、CH 4、CO2、C2 H4、C2 H6、C3 H6和C3 H8的气体吸附、渗透和扩散系数。在这里，在25至55摄氏度的温度下，在很宽的压力范围内进行了类似的测量和分析。在所有情况下，吸附等温线一般是一致的形式的双吸附模型。对于He、H-2、N-2、O-2、CH 4和CO2，增塑作用的影响最小，可以用双吸附-双迁移模型进行有效分析，并分析了模型参数对温度的依赖性，得到了吸附和扩散过程的能量参数。然而，对于C2 H4，C2 H6，C3 H6和C3 H8，塑化是相当显着的和温度依赖性，因此，在双吸附双迁移率模型方面的类似分析不能有意义地进行。对于所有的气体，P，D和S的一个更唯象的分析是根据简单的Arrhenius和范特霍夫关系，以获得能量参数，随后取决于压力，因为一些组合的双模式和/或塑化效果。(C)2013 Elsevier B. V.保留所有权利。
In a prior paper gas sorption, permeation and diffusion coefficients were determined for He, H-2, N-2, O-2, CH4, CO2, C2H4, C2H6, C3H6 and C3H8 in PIM-1, a polymer of intrinsic microporosity, at 25 degrees C over a range of pressures. Here similar measurements and analyses were made at temperatures from 25 to 55 degrees C over a wide range of pressure. In all cases, the sorption isotherms were generally consistent with the form of the dual-sorption model. For He, H-2, N-2, O-2, CH4 and CO2, the effects of plasticization were minimal and the results could be effectively analyzed by the dual sorption-dual mobility model, and the temperature dependence of the model parameters were analyzed to obtain the energetic parameters for the sorption and diffusion processes. However, for C2H4, C2H6, C3H6 and C3H8, plasticization was quite significant and temperature dependent; as a result, a similar analysis in terms of the dual sorption-dual mobility model could not be meaningfully carried out. For all gases, a more phenomenological analysis of P, D and S was made in terms of simple Arrhenius and van't Hoff relations to obtain energetic parameters that subsequently depend on pressure because of some combination of dual mode and/or plasticization effects. (C) 2013 Elsevier B.V. All rights reserved.