摘要
对苯乙烯-丙烯酸丁酯-丙烯酸三元无皂乳液聚合体系进行了研究,考察了聚合体系中丙烯酸用量、中和度和过硫酸钾引发剂用量等因素对乳液稳定性、单体转化率、乳胶粒径及其分布的影响,并对乳胶粒子的成核机理进行了探讨。实验结果表明,聚合体系中丙烯酸钠起反应型乳化剂的作用,在丙烯酸用量为单体总质量的10%、体系pH为5.6时,可制得稳定的乳液;在中和度一定的条件下,单体转化率随丙烯酸和过硫酸钾用量的增加而增大;体系以均相成核方式为主,乳胶粒子的分散系数小于1.03。
The soap-free emulsion copolymerization of styrene, butyl acrylate and acrylic acid was investigated. The effects of acrylic acid dosage, potassium persulfate initiator dosage and neutralization degree on the emulsion stability, the monomer conversions, the latex particle sizes and their distribution were studied. The nucleation mechanism of the latex particles was discussed. The results showed that sodium acrylate in the system acted as a reactive emulsifier in the copolymerization. Under the conditions of the acrylic acid dosage 10% （based on the total monomer mass） and pH 5.6, the prepared emulsion is stable. The monomer conversions were heightened with increases of the dosages of acrylic acid and initiator at a definite neutralization degree. The main nucleation mechanism for the copolymerization is homogeneous nucleation and the dispersion coefficient of the latex particles is less than 1.03.
出处
《石油化工》
CAS
CSCD
北大核心
2010年第11期1247-1252,共6页
Petrochemical Technology
关键词
苯乙烯
丙烯酸丁酯
丙烯酸
无皂乳液共聚
styrene
butyl acrylate
acrylic acid
soap-free emulsion copolymerization
