聚-α-甲基苯乙烯空心微球制备过程中的缺损研究
Investigation of defects on PAMS microspheres fabricated with microencapsulation method
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摘要: 基于二次乳化技术产生W1/O/W2双重乳液，采用乳液微封装技术制备聚--甲基苯乙烯(PAMS)空心微球，研究了部分工艺参数对PAMS微球缺损形态和比例的影响。实验结果表明：薄壁微球的低强度导致了微球表面缺损。当微球壁厚一定时，有3个因素影响缺损微球比例：W2相中聚乙烯醇质量分数、CaCl2质量分数和O/W2的相比，当它们分别为1.0%，1.5%，0.01时，薄壁(2 m)微球的缺损比例低于40%，球壳内也无气泡存在。Abstract: Poly-(-methylstyrene) (PAMS) microspheres were fabricated with W1/O/W2 double emulsion microencapsulation method,and the effects of polyvinylalcohol (PVA) and CaCl2 weight concentrations and the O/W2 phase ratio on the percentages of defected PAMS microspheres were studied. The weight concentrations of PVA and CaCl2 and the O/W2 phase ratio in the fabrication process of PAMS microspheres were optimized. The results show that, for the three parameters being 1.0%, 1.5%, and 0.01, respectively, the percentage of the defect-free PAMS microspheres without vacuoles in the shell wall can be up to 60%.
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Key words:
- poly-(α-methylstyrene) /
- hollow microsphere /
- defect /
- emulsion microencapsulation /
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