臭氧改性及搅拌桨结构对大直径双层球制备的影响

随着高功率激光器的飞速发展，ICF物理实验对聚苯乙烯（PS）-聚乙烯醇（PVA）双层空心微球的规格要求逐渐提高，直径要求将达到700～900 m。针对该直径范围的PS-PVA双层空心微球，通过采用PS球臭氧化表面改性技术和搅拌桨叶轮结构优化技术，对传统乳液微封装法制备双层空心微球工艺进行了改进，臭氧化表面改性后PS固体核心发生憎水-亲水转变，提高了PS与PVA之间的作用强度；搅拌桨叶轮结构优化，改善了体系容器内溶液流场均匀性，使得微球在整个体系中的运动相对平稳，从而初步制得了直径范围在700～900 m的双层空心微球。

Effects of surface modification by ozonization and structures of impeller on fabricating large-size double-layer hollow microsheres

With the rapid progress of high power laser technology in China, the specifications on the diameters of PS-PVA double-layer hollow microspheres used in inertial confinement fusion (ICF) physical experiments have increased to 700 m～900 m. In order to improve the yield of the double-layer hollow microspheres with 700 m～900 m diameter, both the surface modification on the PS microspheres by ozonizing and the optimization on the structure of impeller for stirring paddle were used to improve the traditional emulsion microencapsulation technique. The hydrophobic surface of the PS microsphere showed hydrophilic properties after the ozonization modification, which enhanced the interaction between PS microspheres and PVA coatings. Moreover, the optimization on the structure of impeller for stirring paddle improved the uniformity of the liquid field in the container, resulting in the movement stability of the microspheres. The above modifications benefited improving the yield of the large-diameter double-layer hollow microspheres.