二乙烯基苯泡沫空心球微流体成型技术
Fabrication of divinylbenzene foam shells by microliquid technique
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摘要: 基于微流体成型技术，设计开发了一套用于微胶囊制备的T型微通道乳粒发生器，并利用该装置实现了二乙烯基苯空心泡沫微球的连续制备。以二乙烯基苯的邻苯二甲酸二丁酯溶液为油相，以聚乙烯醇的水溶液为外水相，去离子水为内水相，成功制备出二乙烯基苯双重微乳液，并采用水平旋转加热装置使其凝胶固化，再经过溶剂交换、CO2超临界干燥等过程,制备出直径700～1 200 μm、壁厚60～100 μm、密度90～120 mg·cm-3的二乙烯基苯空心泡沫微球。利用光学显微镜、扫描电镜和X-透射显微镜表征，结果显示：微胶囊球形度、同心度和壁厚均匀性较好，成活率较高，直径单分散性较好，外表面较粗糙。Abstract: Based on the microliquid technique, a T-microchannel droplet generator was designed and developed for the continuous fabrication of hollow foam micro-shells of controlled size. Solutions of an internal water phase, an oil phase (divinylbenzene(DVB) monomer, dibutylphthalate solvent, and azodiisobutyronitrile initiator), and an external water phase were used in the fabrication of micro-shells. DVB hollow foam micro-shells of 700 to 1 200 μm in diameter and 60 to 100 μm in thickness were finally prepared in the density of 90 to 120 mg·cm-3 by level-rotation-heating, solvent exchanging and supercritical drying. Their morphology and diameter dispersivity were characterized by optical microscope, X-ray diffraction microscope and scanning electron microscope, etc. The results show that, the m
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Key words:
- micro-shells /
- microfluid /
- divinylbenzene /
- monodispersity
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