w(MMA)对MMA乳液聚合成核的影响

Effects of mass fraction of monomer on emulsion polymerization nucleation of methyl methacrylate

以甲基丙烯酸甲酯(MMA)为单体,在c(乳化剂)=2mmol/L下制备乳液,研究不同w(MMA)对MMA乳液聚合成核的影响,并分析了不同w(MMA)对乳胶粒粒径的影响规律。实验结果表明:当w(MMA)≤10%,随着w(MMA)的增加转化率逐渐增大,乳胶粒的生成速率也逐渐增大;当w(MMA)≥10%时,转化率可以达到70%以上,w(MMA)对乳胶粒的生成速率的影响不大,多余的单体用于乳胶粒粒径的增长;在w(MMA)=10%时基本能够满足c(乳化剂)=2mmol/L时的成核要求。当5%≤w(MMA)≤30%,在乳化剂的自调节作用下,使得最终形成的乳胶粒数目相差不大。

methyl methacrylate emulsions were prepared with methyl methacrylate under emulsifier mass fraction was 2mmol/L,and the influence of mass fraction of monomer on the polymeric nucleation mechanism was investigated.Then,the influence of different concentration monomer on latex particle size was analyzed.Experimental results showed that the conversion rate of monomer and the formation rate of latex particle increased gradually with the increase of mass fraction of monomer when[w（MMA）]≤10%;when [w（MMA]≥10%,the conversion rate of monomer can reach more than70%and The effects of monomers on the emulsion particle formation rate was small and redundant monomer used for the growth of the latex particle size.When[w（MMA]=10%,it could be better afforded to the requirement of the nucleation under the emulsifier mass fraction was 2mmol/L.When the mass fraction of monomer was 5%-30%,Since the self-adjusting function of emulsifier,eventually formed the number of latex particles were basically identical.