The preparation of composite microsphere with hollow core/porous shell structure by self-assembling of latex particles at emulsion droplet interface.
The preparation of composite microsphere with hollow core/porous shell structure by self-assembling of latex particles at emulsion droplet interface.
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DOI：
10.1016/j.jcis.2006.02.026
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发表时间：
2006-07
影响因子：
9.9
通讯作者：
Xiaodong He;X. Ge;Mozhen Wang;Zhi Zhang
中科院分区：
文献类型：
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作者：
Xiaodong He;X. Ge;Mozhen Wang;Zhi Zhang
通过磺化聚苯乙烯（SPS）乳胶粒子在乳液液滴界面的自组装，再用硬质三聚氰胺-甲醛（MF）复合层固定，制备了亚微米级聚苯乙烯/三聚氰胺-甲醛中空微球复合材料。以微乳液为载体，进一步研究了微乳液的初始位置、胶体模板的亲水性和尺寸、油相溶剂和乳液放置时间等因素对微乳液的粒径、均匀性和渗透性的影响。获得了粒径相对均匀的颗粒堆积液滴，平均粒径为10 μm。在制备复合微球后，组装的SPS颗粒保持有序和最小的接触，这允许从颗粒之间的间隙控制渗透性。形成多孔网状结构的MF复合层以进一步控制渗透性。用光学显微镜、扫描电镜和透射电镜对乳液和复合微球的形貌进行了表征。
A submicrometer-scaled polystyrene/melamine–formaldehyde hollow microsphere composite was prepared by self-assembling of sulfonated polystyrene (SPS) latex particles at the interface of emulsion droplets and then being fixed in place using a hard melamine–formaldehyde (MF) composite layer. For control-released purposes, the influential factors that control the size and uniformity of the packed-droplets and the permeability of the composite shell, including the initial particle location, the hydrophilicity and the size of colloidal templates, the oil phase solvent and reserving time of emulsions after the addition of MF prepolymer, were further studied. Relatively uniform sized particle packed-droplets with an average diameter of 10 μm were obtained. The assembled SPS particles kept ordering and minimal conglutination after the preparation of composite microspheres, which allows of controlling the permeability from the interstices between the particles. Porous-mesh-structured MF composite layer was formed to further control the permeability. The morphology of emulsions and composite microspheres were characterized by optical microscopy, scanning and transmission electron microscopy.