Novel inorganic morphologies formed in polyimide/silica hybrid films |
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Authors: | Yuyuan Deng Yi Gu |
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Institution: | College of Polymer Science and Engineering, State Key Laboratory of Polymeric Materials Engineering, Sichuan University, Chengdu, Sichuan 610065, PR China |
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Abstract: | 2-(4-Aminophenyl)-5-aminobenzimidazole was used to prepare polyimide/silica hybrid films via sol-gel process. At 40 wt.% silica content, hybrid films were still translucent. No noticeable silica particle has been observed. Unexpectedly, after treating at 800 °C, novel morphologies of silica were observed on the surface of inorganic films, which changed from homogeneous to sea-island and to co-continuous structure with increasing silica content in the matrix. Hydrogen bonding between NH in imidazole and silanol group results that silica tends to linear structures, which is considered as the main reason for this morphological change. |
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Keywords: | Polyimide/silica hybrid films Morphologies Hydrogen bonding Structure of silica Phase behaviors |
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