Chemically induced phase separation in the preparation of porous epoxy monolith |
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Authors: | Jianhua Li Zhongjie Du Hangquan Li Chen Zhang |
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Institution: | The Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, No. 15, Bisanhuan East Road, Chaoyang District, Beijing 100 029, People's Republic of China |
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Abstract: | A methodology for preparing porous epoxy monolith via chemically induced phase separation was proposed. The starting system was a mixture of an epoxy precursor, diglycidyl ether of bisphenol‐A (DGEBA), a curing agent, 4,4′‐diaminodiphenylmethane (DDM), and a thermoplastic polymer, polypropylene carbonate (PPC). As DGEBA was cured with DDM, the system became phase‐separated having PPC particles dispersed in epoxy matrix. After PPC particles were removed by thermal degradation, a porous structure was obtained. The phase separation mechanism was determined by the initial composition and illustrated by a pseudophase diagram. The pore size increased with increasing the concentration of PPC and raising the curing temperature. The intermediate and final morphologies of the system were studied using optical and scanning electron microscopy, respectively. © 2010 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2010 |
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Keywords: | chemically induced phase separation polypropylene carbonate porous epoxy monolith thermal degradation |
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