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首页> 外文期刊>Journal of industrial and engineering chemistry >Propylene-induced plasticization in silver polymer electrolyte membranes
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Propylene-induced plasticization in silver polymer electrolyte membranes

机译：银聚合物电解质膜中丙烯诱导的增塑

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摘要

Silver polymer electrolyte membranes consisting of AgBF4 or AgCF3SO3 dissolved in poly(2-ethyl-2-oxazoline) (POZ) or poly(N-vinyl pyrrolidone) (PVP) have previously shown outstanding separation performance for propylene/propane mixtures. The ideal separation factor (i.e. pure gas selectivity) of propylene over propane reached 15,000, but the actual selectivity (i.e. mixed gas selectivity) was approximately 50. In this study, the origin of large difference between pure and mixed gas selectivities has been elucidated in terms of membrane plasticization by propylene molecules. The membrane plasticization was confirmed by the decrease of selectivity with increasing propylene concentration in the feed, resulting from the increase of both propylene and propane permeances. The decrease of glass transition temperature (T_g) in silver polymer electrolytes upon the sorption of propylene also supported the membrane plasticization, determined by in situ high-pressure differential scanning calorimetry (HPDSC). Further analysis of configuration entropy model revealed that the interaction of propylene/ silver ion in P0Z/AgBF4 was approximately 2-fold stronger than that in P0Z/AgCF3SO3, which is in good agreement with the results of propylene solubility and FT-IR spectra.
机译：由AgBF4或AgCF3SO3溶解在聚（2-乙基-2-恶唑啉）（POZ）或聚（N-乙烯基吡咯烷酮）（PVP）中组成的银聚合物电解质膜先前已显示出对丙烯/丙烷混合物的出色分离性能。丙烯与丙烷的理想分离因子（即纯气体选择性）达到15,000，但实际选择性（即混合气体选择性）约为50。在这项研究中，阐明了纯气体和混合气体选择性之间存在较大差异的原因丙烯分子对膜的增塑作用通过增加进料中丙烯浓度而导致的选择性的降低证实了膜的增塑，这归因于丙烯和丙烷渗透率的增加。银聚合物电解质中丙烯吸附后玻璃化转变温度（T_g）的降低也支持了膜增塑，这是通过原位高压差示扫描量热法（HPDSC）确定的。对结构熵模型的进一步分析表明，P0Z / AgBF4中丙烯/银离子的相互作用比P0Z / AgCF3SO3中的丙烯/银离子的相互作用强约2倍，这与丙烯溶解度和FT-IR光谱的结果非常吻合。

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