CAJ | 학술논문

以苯乙烯St为代表性单体，以聚乙烯醇PVA为分散剂，以十六烷HD为助稳定剂，以亚硝酸钠NaNO2为水相阻聚剂，通过基于超声均质化的微悬浮聚合制得了一系列亚微米级聚苯乙烯胶粒。对亚微米级单体液滴的均质化产生及后续聚合过程中分散相尺寸的变化进行了考察。发现超声均质化和高分子分散剂的结合有利于制备粒径小、分布窄的稳定微悬浮液滴，而吸附于液滴表面的高分子分散剂、油相内的助稳定剂及水相中的阻聚剂的协同作用能使聚合过程较好地保持分散相原有的粒径大小及分布。因而通过改变超声均质强度，可较容易地在0.5～3.5μm范围内自由调节胶粒的平均粒径。相对于常规的剪切均质微悬浮聚合，超声均质微悬浮聚合可更好地填补(细)乳液聚合与悬浮聚合在粒径分布范围上的间隙，有望高效、高容量地微胶囊化包裹亚微米级目标内容物。
이분을희St위대표성단체，이취을희순PVA위분산제，이십륙완HD위조은정제，이아초산납NaNO2위수상조취제，통과기우초성균질화적미현부취합제득료일계렬아미미급취분을희효립。대아미미급단체액적적균질화산생급후속취합과정중분산상척촌적변화진행료고찰。발현초성균질화화고분자분산제적결합유리우제비립경소、분포착적은정미현부액적，이흡부우액적표면적고분자분산제、유상내적조은정제급수상중적조취제적협동작용능사취합과정교호지보지분산상원유적립경대소급분포。인이통과개변초성균질강도，가교용역지재0.5～3.5μm범위내자유조절효립적평균립경。상대우상규적전절균질미현부취합，초성균질미현부취합가경호지전보(세)유액취합여현부취합재립경분포범위상적간극，유망고효、고용량지미효낭화포과아미미급목표내용물。
Using styrene as typical monomer, polyvinyl alcohol PVA as dispersant, hexadecane HD as co-stabilizer, NaNO2 as water-soluble polymerization inhibitor, a series of submicron polystyrene particles were prepared by micro-suspension polymerization with the help of ultrasonic homogenization. The formation of submicron droplets during homogenization and the variation of particles size and size distribution of disperse phase during polymerization were investigated. It was found that the combination of ultrasonic homogenization and polymer dispersant was conducive to reducing the size of monomer droplet and stabilizing the micro-suspension. The synergistic effect of PVA adsorbed on the surface of droplets, HD dispersed in the droplets phase and NaNO2 dispersed in the water phase facilitated maintenance of disperse phase size during polymerization. Thus the size of colloidal particles could be controlled by varying ultrasonic intensity. Comparing with the conventional micro-suspension polymerization using shear homogenization, the micro-suspension polymerization using ultrasonic homogenization was more suitable to fill the particle size gap between (mini-)emulsion polymerization and suspension polymerization, and more likely to encapsulate the submicron target contents.