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首页> 外文期刊>Journal of Applied Polymer Science >Microstructure relaxation process of polyhexafluoropropylene after swelling in supercritical carbon dioxide
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Microstructure relaxation process of polyhexafluoropropylene after swelling in supercritical carbon dioxide

机译：超临界二氧化碳溶胀后聚六氟丙烯的组织松弛过程

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摘要

This paper studies the process of relaxation of a polymer after swelling in supercritical carbon dioxide. Polyhexafluoropropylene (PHFP) was chosen as the object for investigation. The relaxation process was monitored by a change of the permeability coefficients for a number of gases. Thin polymeric films of PHFP were modified by different treatments: drying to a constant weight, annealing at a temperature slightly higher than the glass-transition temperature, and swelling in supercritical carbon dioxide. The permeability coefficients of six gases, He, H-2, O-2 N-2,N- CO2, and CH4, were measured after each stage of the treatment. It was shown that the permeability coefficients in the films were increased by 2.4 times for He, 3.6 for H-2, 5.9 for O-2, 8.1 for N-2, 6.7 for CO2, and 10.9 for methane. The permeability coefficients of the same gases were measured 50 days later after swelling in supercritical carbon dioxide. A decrease in the permeability coefficient demonstrated that the relaxation process had taken place. Nevertheless, the values exceeded the initial ones for annealed samples by 2.0 times for He, 2.4 for H-2, 1.8 for O-2, 1.7 for N-2, 1.7 for CO2, and 1.3 for methane. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43105.
机译：本文研究了在超临界二氧化碳中溶胀后聚合物的松弛过程。选择聚六氟丙烯（PHFP）作为研究对象。通过改变多种气体的渗透系数来监测弛豫过程。通过不同的处理方法对PHFP的聚合物薄膜进行改性：干燥至恒重，在略高于玻璃化转变温度的温度下退火以及在超临界二氧化碳中溶胀。在每个处理阶段之后，测量六种气体（He，H-2，O-2 N-2，N-CO2和CH4）的渗透系数。结果表明，He的膜的渗透系数增加了2.4倍，H-2的渗透系数增加了3.6倍，O-2的渗透系数增加了5.9倍，N-2的渗透系数增加了8.1倍，CO2的渗透系数增加了6.7，甲烷的溶解度增加了10.9倍。在超临界二氧化碳中溶胀50天后，测量相同气体的渗透系数。渗透系数的降低表明松弛过程已经发生。然而，该值比退火样品的初始值高出He的2.0倍，H-2的2.4，H-2的1.8，N-2的1.7，CO2的1.7和甲烷的1.3。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2016，133，43105。

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