Gas transport properties of fluorinated poly(ether imide) films containing phthalimidine moiety in the main chain
Gas transport properties of fluorinated poly(ether imide) films containing phthalimidine moiety in the main chain
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DOI：
10.1016/j.memsci.2009.12.011
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发表时间：
2010-03
影响因子：
9.5
通讯作者：
S. Sen;Susanta Banerjee
中科院分区：
文献类型：
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作者：
S. Sen;Susanta Banerjee
在3.5bar的上游压力下，系统地研究了主链上含有邻苯二胺基团的5种新型氟化聚醚亚胺（PEI）薄膜在3种不同温度（35、45和55℃）下的气体输运特性。研究了聚醚亚胺（PEI）薄膜中邻苯二胺单元的存在和五种芳二酐的结构变化对四种气体（CO2、O2、n2和CH4）的透性及其对两种气体的过电选择性的影响。以新型氟化二胺3,3-二-[4-{2 ' -三氟甲基4 ' -（4″-氨基苯基）苯氧基苯基]-2-苯基-2,3-二氢异吲哚-1- 1- 1为原料，与BPADA、6-FDA、BTDA、ODPA和PMDA五种不同的二氢化物进行热亚酰化反应，制备了聚胺酸薄膜。所有PEI薄膜的渗透系数都明显高于常见的玻璃状聚合物，如醋酸纤维素、聚砜和聚碳酸酯，以及其他以邻苯酞或邻苯二胺或邻苯二胺部分为基础的聚合物。PEI-II和PEI-V对所有气体的渗透系数都非常高（分别为[公式：见文本]屏障），与之前报道的基于邻苯二胺的非氟聚芳醚砜相比，它们对co2的选择性更高（分别为53.32和50.09）。此外，与先前报道的基于邻苯二胺的聚（芳醚砜）或聚（芳醚酮）相比，这些系列PEI薄膜对O2的高渗透系数（分别为[式：见文]屏障）和相对于N2的相当的对O2的渗透选择性（4.4-6.35）使得这些系列PEI薄膜非常有趣。通过渗透扩散过程的温度依赖性，可以计算出这四种不同气体通过这五种PEI薄膜的渗透扩散过程的活化能。本文试图在重复单元结构或官能团与该系列PEI薄膜的气体输运性质之间建立结构-性能关系。
Gas transport properties of five new fluorinated poly(ether imide) (PEI) films containing cardo phthalimidine moiety in the main chain were systematically investigated at three different temperatures (35, 45 and 55°C) under an applied upstream pressure of 3.5bar. The effect of presence of the cardo phthalimidine unit and structural variations of five aromatic dianhydrides in these poly(ether imide) (PEI) films towards the gas permeation of four gases (e.g., CO2, O2, N2and CH4) and their permselectivity for pair of gases were investigated. The films were prepared by the thermal imidization of the poly(amic acid)s of the reaction products of a new fluorinated diamine, 3,3-bis-[4-{2′-trifluoromethyl 4′-(4″-aminophenyl)phenoxy}phenyl]-2-phenyl-2,3-dihydro-isoindole-1-one with five different dianhydrides namely, BPADA, 6-FDA, BTDA, ODPA and PMDA. All the PEI films exhibited significantly high permeability coefficients than those of common glassy polymers, e.g., cellulose acetate, polysulfone and polycarbonate as well as to other polymers based on cardo phenolphthalein or phthalimide or phthalimidine moiety. PEI-II and PEI-V showed exceptionally high permeability coefficient for all the gases ( [Formula: see text] Barrers, respectively) along with higher permselectivity towards CO2relative to CH4(53.32 and 50.09, repectively) in comparison to cardo phthalimidine based non-flourinated poly(arylene ether sulfones) reported previously. Moreover, high permeability coefficients for O2( [Formula: see text] Barrers, respectively) and comparable permselectivities towards O2relative to N2(4.4–6.35) made these series of PEI films highly interesting in comparison to the previously reported phthalimidine based poly(arylene ether sulfone)s or poly(arylene ether ketone)s. Temperature dependency of the permeation and diffusion processes enables to calculate the activation energies of the permeation and diffusion processes for these four different gases through these five PEI films. An attempt has been taken to draw a structure–property correlationship between the repeat unit structures or the functional groups present, and the gas transport properties of this series of PEI films.