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MMA/BA半连续乳液聚合过程中乳胶粒径及其分布
Particle size and its distribution of MMA/BA Semi-continuous Emulsion Polymerization
- 工程科学与技术 2009年41卷第5期 页码：108-113
- 作者机构：
1. 华南理工大学化学与化工学院
2. 华南理工大学 化学与化工学院广东,广州,510640
- 作者简介：
- 基金信息：国家自然科学基金
DOI：
中图分类号：纸质出版日期：2009，
网络出版日期：2009-1-15，
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张心亚,孙志娟,江庆梅.MMA/BA半连续乳液聚合过程中乳胶粒径及其分布[J].工程科学与技术,2009,41(5):108-113.
Zhang Xin-ya, 孙志娟, 江庆梅. Particle size and its distribution of MMA/BA Semi-continuous Emulsion Polymerization[J]. Advanced Engineering Sciences, 2009,41(5):108-113.
摘要
中文摘要: 以甲基丙烯酸甲酯（MMA）与丙烯酸丁酯(BA)进行聚合制备丙烯酸酯乳液，研究半连续种子乳液聚合过程中乳化剂、引发剂、反应温度及单体配比对乳胶粒粒径分布（PSD）的影响。实验结果表明：在种子半连续乳液聚合中，当乳化剂浓度[E]增大、引发剂浓度[I]减小和MMA的摩尔分率fMMA增大时，整个聚合过程中同一反应时间的粒径分布变窄；而反应温度T对PSD的影响非单向的，当T从70℃上升到85℃时， PSD逐渐变窄，而在90℃时，PSD在成核阶段迅速增大，粒子分散度Fmax已超过85℃时的值，且在后期也一直保持较窄的分布。粒径分布表明在种子半连续乳液聚合过程中，乳胶粒子的粒径一直呈增长趋势，而粒径分布则是在成核阶段由窄变宽，待成核结束一段时间后反应稳定进行，乳胶粒子的分布又开始变窄，最终保持一个较低的分散度。
Abstract
Abstract:The all acrylate emulsion was prepared with hydrophilic monomer methyl methacrylate (MMA) and hydrophobic monomer butyl acrylate (BA)
and the influence of the reaction temperature(T)
the concentration of initiator([I])，emulsifier([E]) and the monomer ratio(fMMMA) on the particle size and its’ distribution(PSD) was investigated for semi-continuous seeded emulsion polymerization. The experimental results show that the evolvement rule of PSD is changed from narrow to wide and then returned to narrow in the whole process of polymerization. The influence of [E]
[I]
fMMA and T on PSD is various
PSD tends toward narrow at the same reaction time when [E] increases
[I] decreases and fMMA increases; but the influence of T on PSD is not unidirectional
PSD tends toward narrow when T is raised from 70℃ to 85℃
but when T is up to 90℃
PSD tends toward wide rapidly in nucleation stage
particle dispersion index Fmax is more than the value at 85℃
and Fmax returns to narrow slightly in later continuous polymerization stage. The particle size analysis shows that for semi-continuous seeded emulsion polymerization
the particle size increases at all time
but the PSD is narrow to wide during the nucleation stage
then becomes narrow after nucleation stage
finnally keeps a narrow dispersion.
关键词
半连续乳液聚合粒径及其分布分散度
Keywords
Semi-continuous emulsion polymerizationParticles size and its’ distributionparticle dispersion index
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