干凝胶炉法制备聚苯乙烯空心微球
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摘要: 研究了一步乳化法制备初始粒子的过程中相比及搅拌强度对初始粒子直径的影响，初步探讨了干凝胶炉内成球过程中，炉温、炉内气氛、压力等对聚苯乙烯(PS)空心微球产率及同心度的影响。以分子量为22万的聚苯乙烯制得了直径在70～550μm的初始粒子，经乙醇浸泡后，制得了含2%质量分数发泡剂的干凝胶粒子，并在Polymer-700干凝胶炉上制备出了外直径为400～900μm、壁厚为2～10μm、同心度≥95%的PS空心微球。Abstract: The technological processes of polystyrene (PS) initial granules and the hollow microshells formed on a vertical drop furnace from the granules dealt with a foamer are investigated. The initial granules are produced by one step emulsion techniques. Influences of phase ratio and stirring intensity on diameter distributions of initial granuales are discussed., and alcohol is selected as a foamer according to the boiling point and solubility. Then effects of temperatures、gaseous compositions and pressures inside the furnace on the quality of PS microshells fabricated from the granules are experimented. As a result, optimal conditions are selected to make PS microshells with outer diameters of 400～900m m , wall-thickness of 2~10m m and concentricity better than 95%.
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