摘要
以过硫酸钾(KPS)为引发剂、十二烷基硫酸钠(SDS)为乳化剂,利用正相乳液聚合制备(甲基丙烯酸甲酯-co-丙烯酸)共聚物(P(MMA-co-AA))乳液。通过测定聚合转化率和观察聚合过程稳定性,探讨了AA与MMA不同质量比时制备稳定的共聚物乳液的工艺条件;通过黏度法测定了乳液在不同pH时的相对黏度η,利用粒度分析仪分析了乳胶粒子在不同pH时的平均粒径和粒径分布。结果表明:AA含量较高时,控制聚合时间是得到稳定聚合物乳液的关键,当m(AA)/m(MMA)=12.5/100,65℃下反应120 min时,所制得的乳液稳定性最好。随着pH增大,乳液黏度先增大后降低;随着m(AA)/m(MMA)增加,制得的乳液pH敏感性增大;随着乳液从酸性(pH=5.17)变到碱性(pH=8.61),聚合物乳胶粒子平均粒径减小,粒径分布变窄。
P （MMA-co-AA） copolymer latex was prepared by emulsion polymerization, using KPS as an initiator and SDS as an emulsifier. The relative viscosity of the latex and the average size and size distribution of the latex particles at different pH value were investigated. Results show that the polymerization time plays a key role in preparing stable latex with higher content of AA monomer. The latex prepared at 65 ℃ for 120 min when m（AA）/m（MMA） = 12.5/100 is the most stable. The relative viscosity of latex increases and then decreases with the increasing of pH value, and latex is more sensitive to pH value when the monomer ratio of AA and MMA increases. The average size of the latex particles reduces and the particle size distribution becomes narrower as the acidic latex （pH=5.17） becomes basic （pH=8. 61）.
出处
《功能高分子学报》
CAS
CSCD
北大核心
2008年第4期375-379,共5页
Journal of Functional Polymers
