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首页> 外文期刊>Journal of Applied Polymer Science >Effect of hydrophobic hexafluoroisopropylidene group on the water sorption behaviors of rigid poly(p-phenylene pyromellitimide) polyimide thin films
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Effect of hydrophobic hexafluoroisopropylidene group on the water sorption behaviors of rigid poly(p-phenylene pyromellitimide) polyimide thin films

机译：疏水性六氟异亚丙基对硬质聚对苯二甲基均苯四甲酰亚胺聚酰亚胺薄膜吸水性能的影响

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摘要

We prepared poly(p-phenylene pyromellitimide) (PMDA-PDA), poly(p-phenylene 4,4'-hexafluoroiso-propylidene diphthalimide), and their copolyimides with various compositions to explore the relationship between the water sorption and structure. The water sorption behaviors were gravimetrically investigated as a function of composition and temperature and interpreted with a Fickian diffusion model in films. Overall, the water sorption behaviors were strongly dependent on the changes in morphological structure, which originated from the variations in composition. When the content of the bulky hexafluoroisopropylidene group (6FDA) was increased, the water uptake decreased from 5.80 to 3.18 wt %, whereas the diffusion coefficient increased from 3.6 X 10(-10) to 11.3 X 10(-10) cm(2)/s. The relatively high water uptake in the PMDA-PDA polyimide film was successfully healed by the incorporation of 6FDA, which may have resulted from the increases in the intermolecular packing order and hydrophobicity. The degree of orientation and crystallinity, which are in-plane characteristics, were directly correlated to the diffusion coefficient and activation energy in the polyimide film. (C) 2003 Wiley Periodicals, Inc. [References: 19]
机译：我们制备了聚对苯二甲基均苯四甲酰亚胺（PMDA-PDA），聚对苯四甲基4,4'-六氟异亚丙基二邻苯二甲酰亚胺及其共聚酰亚胺，并用各种组成研究了吸水率与结构之间的关系。重量分析了吸水行为与成分和温度的关系，并用菲克扩散模型对薄膜进行了解释。总的来说，水的吸附行为在很大程度上取决于形态结构的变化，而形态结构的变化是由组成的变化引起的。当大体积六氟异亚丙基（6FDA）的含量增加时，吸水率从5.80 wt％降低到3.18 wt％，而扩散系数从3.6 X 10（-10）cm增加到11.3 X 10（-10）cm（2） / s。 PMDA-PDA聚酰亚胺薄膜中较高的吸水率通过6FDA的加入得以成功治愈，这可能是由于分子间堆积顺序和疏水性的增加所致。面内特性的取向度和结晶度与聚酰亚胺膜中的扩散系数和活化能直接相关。 （C）2003 Wiley Periodicals，Inc. [参考：19]

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