Preparation of porous crosslinked polymers with different surface morphologies via chemically induced phase separation
Preparation of porous crosslinked polymers with different surface morphologies via chemically induced phase separation
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DOI：
10.1002/polb.22274
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发表时间：
2011-07
期刊：
影响因子：
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通讯作者：
Yu-Shun Luo;K. Cheng;N. Huang;Wen-Pang Chiang;Shunheng Li
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文献类型：
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作者：
Yu-Shun Luo;K. Cheng;N. Huang;Wen-Pang Chiang;Shunheng Li
本研究展示了一种新的简单的方法来生产具有可控表面形貌的交联聚合物。该多孔交联聚合物是由环氧树脂、D.E.R. 331和二乙烯三胺在二异丁基酮（DIBK）中逐步聚合而成的。固化聚合物的表面和体形态都取决于反应溶液的溶剂分数。当DIBK浓度大于30 vol %时，在30°C固化过程中发生了化学诱导相分离（CIPS），交联聚合物中出现了直径约4 μm的封闭球形孔，当溶剂浓度增加到40%和50%时，其直径分别增加到4.5 μm和9 μm左右。环氧网络的表面形态不同于本体的表面形态。通过CIPS工艺可以形成更小的孔径或致密的皮肤，可以通过在固化过程中覆盖不同的接触膜来定制反应溶液。吸附在接触膜表面的富溶剂相和富聚合物相之间的竞争会改变表面形貌。因此，具有相似体形态的多孔交联聚合物可以制备出多种表面结构。©2011 Wiley期刊公司高分子学报（B辑），2011
A novel and simple method for producing crosslinked polymers with controlled surface morphology is demonstrated in this study. The porous crosslinked polymers were made via stepwise polymerization of a mixture of epoxy resin, D.E.R. 331, and diethylene triamine in diisobutyl ketone (DIBK). Both the surface and bulk morphology of the cured polymers are dependent on the solvent fraction of the reactive solution. When the concentration of DIBK was more than about 30 vol %, chemically induced phase separation (CIPS) occurred during cure at 30 °C, and closed spherical pores, about 4 μm in diameter, appeared in the bulk of the crosslinked polymers, whose diameter increased to about 4.5 and 9 μm when the solvent was increased to 40% and 50%, respectively. The surface morphology of the epoxy networks is different from that of the bulk. Smaller pore size or dense skin was formed via the CIPS process, which can be tailored by covering the reactive solution with different contacting films during cure. The competition between the solvent-rich and polymer-rich phase absorbed onto the surface of contacting film could change the surface morphology. Therefore, the porous crosslinked polymers having similar bulk morphology could be prepared with a variety of surface structures. © 2011 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2011