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D4 单体细乳液的稳定性探讨

2013-05-15 16:08

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以八甲基环四硅氧烷( D4 )作为模型单体, 分别使用高速分散机、超声波仪和高压均质机制备了D4细乳液,使用多重光散射稳定性分析仪(M LS)分析比较了不同方法制备的D4细乳液的稳定性, 并通过稳定性的分析, 研究了均质压力和乳化剂浓度对单体细乳液的稳定性的影响。结果表明, 在同样的乳化剂浓度下采用高压均质机制备的细乳液稳定性最好, 能够稳定进行细乳液聚合; 随着均质压力( 10~ 110M Pa) 增大, D4细乳液的稳定性先增强后减弱, 在90MPa下制备的细乳液稳定性最好, 乳液粒径增长速率仅为0􀀁342 nm /m in; 随着DBSA 浓度( 0􀀁0092~0􀀁0460m o l/L)增大, 在相同均质条件下( 90M Pa下均质4次) 制备的单体细乳液稳定性增强, 粒径增长速率都小于0􀀁505 nm /m in, 具有较好的稳定性。

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