摘要
研究了在少量聚乙二醇马来酸单酯钠盐存在下， ＭＭＡ／ＢＡ无皂乳液聚合成粒过程， 发现聚合初期产生的初级粒子消失后， 两次周期性地产生小粒子． 经分析， 是新的成核作用产生的，表明在聚合的中晚期， 成核过程并未真正结束， 而是处于成核－聚并的动态平衡之中．
The particle formation mechanism of MMA/BA emulsifier free emulsion polymerization in the presence of small amount of ZA 6 comonomer(sodium polyethylene glycol 600 maleate) was investigated with Coulter LS 230 laser particle size analyzer. After the primary particles of the early stage have vanished, new small particles were twice found periodically. It is believed to be formed by new nucleations by theoretical and data analyses and is called periodic nucleation phenomenon. It is suggested that the nucleation processes do not end really at the middle and later stages of the polymerization, and it is in the dynamic equilibrium of nucleation and aggregation.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第11期1800-1803,共4页
Chemical Journal of Chinese Universities
关键词
无皂乳液聚合
成粒机理
周期成核现象
MMA
BA
Emulsifier free emulsion polymerization, Particle formation mechanism, Periodic nucleation phenomenon
