Effect of hydrophobic hexafluoroisopropylidene group on the water sorption behaviors of rigid poly(p-phenylene pyromellitimide) polyimide thin films
Effect of hydrophobic hexafluoroisopropylidene group on the water sorption behaviors of rigid poly(p-phenylene pyromellitimide) polyimide thin films
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疏水性六氟异亚丙基对刚性聚对亚苯基均苯四酰亚胺聚酰亚胺薄膜吸水行为的影响
DOI：
10.1002/app.12552
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发表时间：
2003
影响因子：
3
通讯作者：
Haksoo Han
中科院分区：
文献类型：
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作者：
Jongchul Seo;Sang Yup Lee;Wonbong Jang;Haksoo Han
我们制备了聚（对苯基邻苯二甲酰亚胺）（PMDA-PDA）、聚（对苯基4,4′-六氟异丙基二苯酞亚胺）及其不同组成的共聚亚胺，探索其吸水性与结构之间的关系。用重量法研究了水的吸附行为作为组分和温度的函数，并用菲克扩散模型对其进行了解释。总体而言，吸水行为强烈依赖于形态结构的变化，而形态结构的变化源于组分的变化。随着大体积六氟异丙基（6FDA）含量的增加，吸水率从5.80 wt %下降到3.18 wt %，而扩散系数从3.6 × 10−10 cm2/s增加到11.3 × 10−10 cm2/s。掺入6FDA后，PMDA-PDA聚酰亚胺膜中相对较高的吸水率被成功修复，这可能是由于分子间排列顺序和疏水性的增加。取向度和结晶度与聚酰亚胺薄膜中的扩散系数和活化能直接相关。©2003 Wiley期刊公司应用化学学报，2009,31 (2):442 - 446
We prepared poly(p-phenylene pyromellitimide) (PMDA–PDA), poly(p-phenylene 4,4′-hexafluoroisopropylidene 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 × 10−10 to 11.3 × 10−10 cm2/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. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 3442–3446, 2003
T.Yamamoto：“头尾型聚（3-己基噻吩-2, 5-diy）及相关聚合物和化合物在基材上的分子排列”J。
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