乳化剂组成与压力对中空聚合物微球的影响
Influences of emulsive component and treatmental pressure on hollow polymer particles
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摘要: 在高温高压下，以单分散的P(St-MAA)为种子微球，采用碱/冷却法制备了P(St-MAA)中空聚合物微球。研究了乳化剂 (Tween-80和Span-80) 组成对P(St-MAA)种子微球的影响和压力对其形成中空结构的影响。扫描电子显微镜、透射电子显微镜等测试分析表明，乳化剂组成对种子微球的分散性影响明显：P（St-MAA)粒子的单分散性随着Tween-80含量的增加而逐渐变好。当单体St与MAA质量比一定时，乳化剂Tween-80与Span-80的质量比为3∶1时，可得到制备中空微球必需的单分散P(St-MAA)种子微球；种子微球经高温高压处理后，可形成平均壁厚为50 nm的单分散中空聚合物微球。Abstract: Hollow polymer microspheres were prepared by alkali/cooling method at high temperature under high pressure using monodisperse styrene-methylacrylic acid copolymer particles. The effects of components of emulsifiers on the particles and of the pressure on their hollow structure were clarified. As clearly revealed by the SEM and TEM analyses, the type of emulsifiers had great effect on dispersion of copolymer particles. The monodisperion of P(St/MAA) becomes better as the content of Tween-80 increases. When the mass ratio between emulsifiers Tween-80 and Span-80 was 3∶1, hollow polymer microspheres were obtained by monodispersed P(St-MAA) particles. And hollow polymer microspheres with 50 nm average shell thickness formed at high temperature under high pressure.
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Key words:
- hollow polymer microspheres /
- alkali/cooling method /
- emulsion polymerization /
- emulsifiers /
- pressure
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