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首页> 外文期刊>RSC Advances >Preparation of fluoropolymer materials with different porous morphologies by an emulsion template method using supercritical carbon dioxide as a medium
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Preparation of fluoropolymer materials with different porous morphologies by an emulsion template method using supercritical carbon dioxide as a medium

机译：以超临界二氧化碳为介质，通过乳液模板法制备具有不同多孔形态的含氟聚合物材料

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The choice of a suitable surfactant is key to the formation of a stable water-in-CO _(2) (W/C) or CO _(2) -in-water (C/W) emulsion. It is even more critical in stabilization of the emulsion containing carbon dioxide (CO _(2) ). In this study, the successful preparation of W/C emulsion was achieved by using the amphiphilic block polymer poly(ethylene glycol) methyl ether- b -poly(trifluoroethyl methacrylate) (mPEG _(45) - b -(TFEMA) _( n ) ) as a surfactant, in which CO _(2) was used as a solvent for the fluoromonomer, trifluoroethyl methacrylate (TFEMA). In the case of the W/C emulsion, CO _(2) and TFEMA were used as the continuous phase and water as the internal phase of the emulsion system. It has been found that in the length of the block polymer mPEG _(45) - b -(TFEMA) _( n ) , the fluorine-containing chain end has a significant effect on the morphology of the polymer and the type of emulsion formed. The morphology of the polymer was observed by scanning electron microscopy which confirmed the type of emulsion formed. With the fluorine-containing end segment, the morphology of the polymer changes from a small hollow sphere in a large hollow sphere to a hollow spherical to a porous structure. Correspondingly, it could be concluded that the type of emulsion could go through the process from water-in-CO _(2) -in-water-in-CO _(2) (W/C/W/C) emulsion to water-in-CO _(2) -in-water (W/C/W) emulsion to water-in-CO _(2) (W/C) emulsion. Also, suitable co-surfactants were identified in this study. Investigations were also attempted to check the effect of the amount of surfactant, cross-linker and water/CO _(2) ratio on the type of emulsion formed as well as the morphology of the resultant polymer.
机译：选择合适的表面活性剂是形成稳定的水包CO_（2）（W / C）或CO_（2）水包（C / W）乳液的关键。对于含二氧化碳的乳液（CO _（2））的稳定化来说，这一点尤为重要。在这项研究中，通过使用两亲性嵌段聚合物聚（乙二醇）甲醚-b-聚（甲基丙烯酸三氟乙酯）（mPEG _（45）-b-（TFEMA）_（n ））作为表面活性剂，其中使用CO_（2）作为氟代单体甲基丙烯酸三氟乙酯（TFEMA）的溶剂。在W / C乳液的情况下，使用CO_（2）和TFEMA作为连续相，使用水作为乳液体系的内相。已经发现，在嵌段聚合物mPEG _（45）-b-（TFEMA）_（n）的长度上，含氟链端对聚合物的形态和形成的乳液的类型具有显着影响。 。通过扫描电子显微镜观察聚合物的形态，这证实了形成的乳液的类型。对于含氟端段，聚合​​物的形态从大空心球中的小空心球变为空心球至多孔结构。相应地，可以得出结论，乳液的类型可以经历从CO-包水_（2）-CO-包水（2）（W / C / W / C）乳液到水的过程。 -CO-（2）-水包水（W / C / W）乳液，CO-（2）（W / C）水包水。同样，在这项研究中确定了合适的辅助表面活性剂。还试图进行研究以检查表面活性剂，交联剂和水/ CO 2的比例对形成的乳液类型以及所得聚合物的形态的影响。

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