5000/聚醋酸乙烯酯多孔材料的制备及表征(英文发表）

背景：多孔聚合物材料的制备中，泡孔的直径及其分布的控制是当前研究中的难题，但目前尚无有效的解决办法。 目的：采用高内相比乳液模板法，以Span80为引发剂，制备聚醋酸乙烯酯多孔材料，研究制备工艺对其泡孔直径及其分布的影响。 设计、时间及地点：于2008-12/10在泰山医学院高分子化学实验室完成。 材料：苯乙烯，分析纯。二乙烯基苯，分析纯，。Span80,。苯乙烯(St)，分析纯，上海国药集团化学试剂有限公司；二乙烯基苯（DVB），化学纯，天津市永大化学试剂开发中心；Span80乳化剂，化学纯，天津市广成化学试剂有限公司；过硫酸钾，分析纯，天津市纵横兴工贸有限公司 。 方法：向装有电动搅拌器和温度计的250ml三颈烧瓶中加入连续相（苯乙烯、二乙烯基苯、致孔剂等）和乳化剂,搅拌并通过蠕动泵缓慢滴加含有过硫酸钾和CaCl2的水溶液，并控制反应温度。滴加完毕后，继续搅拌，然后移至60℃的水浴中继续聚合。然后，将聚合好的坚硬的固体，切成1cm 厚的小圆盘状，装入Soxlet提取器中，用无水乙醇作溶剂，抽提48小时。再将抽提好的固体放入烘箱中，在60℃下干燥48小时即可制得聚醋酸乙烯酯多孔材料。 多孔材料的泡孔和通道尺寸及其分布是表征多孔材料断面形态的重要参数。将烘干后的多孔材料小心掰断,将断面喷金，用扫描电镜进行观察。用3H-2000Ⅱ型全自动氮吸附比表面积测试仪测定多孔材料的比表面积。 主要观察指标：多孔材料的泡孔直径、泡孔形态。 结果：制备的聚醋酸乙烯酯多孔材料经过电镜分析，表征了它的泡孔形态， 结论：用高内相比乳液模板法，可以制备出泡孔直径可控的多孔材料。

Synthesis and characterization of polyvinylacetate porous materials by high internal phase emulsions as templates

BACKGROUND: PolyHIPE materials have been paid close attention for special biological materials. However, there has been no proper method to control their void diameters and its disperse. OBJECTIVE: To prepare polyVinylacetate porous materials by high internal phase emulsions as templates and study the influence factors on the morphlogies of the result materials. DESIGN, TIME AND SETTING: This study, a single-sample experiment, was performed at the Institute of Chemistry and Chemical Engineering, Taishan Medical University, Taian , Shandong province , China, from March 2007 to October 2008. MATERIALS: Vinylacetate and Divinylbenzene (Aldrich) were purified by passing through a column of basic alumina to remove the inhibitor. Sorbitan monooleate (SPAN 80, Aldrich) and calcium chloride dihydrate were used as supplied. METHODS: The emulsions were obtained by adding dropwise an aqueous solution of CaCl2 and potassium persulfate to the organic phase, made of DVB and Span80 under stirring. The polymerization was carried out at 60 °C in an oven for 48 h. The solid foams were extracted with propanol for 24 h in a Soxhlet apparatus. Solid foams were dried under vacuum at 50 °C to constant mass. MAIN OUTCOME MEASURES: Morphologies and surface areas of the result materials. RESULTS: A Hitachi S2400 electron microscope was used for studies of the morphology of the samples. The surface areas of the samples was caculated from N2 adsorption data by using a BET modle. The adsorption data were obtained by using a Micromeritics Accusorb 2100E instrument. CONCLUSION: By careful optimization of the composition and processing conditions of the emulsion precursor, we are able to produce polyVinylacetate porous materials with tailored surface areas and void diameters.