摘要
以过硫酸钾为引发剂,十二烷基磺酸钠为乳化剂,在50℃下合成了丙烯酸丁酯/丙烯酸(BA/AA)共聚物。以丙酮/甲醇为混合溶剂,在少量水存在下,于30℃制得了BA/AA离聚体。研究表明,乳聚的自动加速效应显著,在聚合时间t为10—20min时,转化率c可达80％—90％,采用连续加料方式,并控制单体滴加速度,聚合反应较平稳,所得共聚物组成较均匀,分子量分布较窄。随乳化剂用量(0.02％—0.1％,质量)的增加,△c/△t值迅速增大,与Smith-Ewart和Gardon的某些结论不相符合。用常温溶液法交联制备离聚体的反应时间应大于20h。
The copolymers of n - butyl acrylate/acrylic acid (BA/AA)were synthesized by the emulsion polymerization with sodium lauric sulfonate as emulsifier and potassium persulfate as initiator at 50°C . The influences of monomer ratios , polymerization temperature , emulsifier amounts and feeding ways of monomer on copolymer composition , monomer conversion and molecular weight distribution were investigated . The copolymers were ionic crosslinked with metal acetate or bases in the mixed solvent of acetone and methyl alcohol at 30°C . The results showed that the auto-acceleration effect of emulsion polymerization was obvious , and the conversion was 80%- 90% within 10- 20 min . The kinetics of emulsion polymerization was different from some conclusions obtained by Smith- Ewart and Gardon . By using continuous feeding way and controlling feeding speed of monomer ,average copolymer composition , narrow molecular weight distribution and high conversion were acquired when monomer ratios were relative stable . The time of ionic crosslinking in solution at room temperature was>20h.
出处
《合成橡胶工业》
CAS
CSCD
北大核心
1991年第4期268-272,共5页
China Synthetic Rubber Industry
基金
国家自然科学基金
关键词
丙烯酸丁酯
丙烯酸
离子聚合物
butyl acrylate
acrylic acid
emulsion polymerization
butyl acrylate-acrylic acid copolymer
chemical crosslinking
ionomer
