摘要
以工业原料α-烯烃磺酸钠(AOS)作为可聚合乳化剂,苯乙烯(St)和丙烯酸丁酯(BA)为单体,采用预乳化种子乳液聚合合成了St-BA-AOS共聚物乳液.通过测定AOS与两种单体的竞聚率确定了半连续加料法的聚合方式.探讨了单体的加料方式、反应温度、反应时间、AOS用量等工艺条件对胶乳的影响,获得了最佳聚合条件.IR,NMR和DSC测试结果分析表明:St,BA与AOS发生了自由基共聚反应,形成的P(St-BA-AOS)共聚物结构中含有磺酸基等亲水性基团有利于乳液的稳定.在此基础上考察了AOS用量对乳液的固含量及乳胶粒粒径等的影响.结果表明:随着AOS用量的增加,乳液的固含量增加、乳胶粒的平均粒径减少.当AOS含量为2%时乳液的固含量为45.01%,平均粒径为74 nm,粒径分布指数为0.08,玻璃化温度为23.17℃.TEM测试结果显示,用相同量的AOS代替十二烷基硫酸钠可得到粒径更小和粒径分布更为均匀的乳液体系.
St-BA-AOS copolymer emulsion was synthesized via the preemulsified emulsion polymeriza-tion,with styrene（St）,butyl acrylate（BA）,and sodium alpha-olefin sulfonate（AOS） as the polymerizable emulsifier.Semi-continuous method of the polymerization was determined by measuring the reactivity ratios of AOS and two monomers.The influences of the feeding method,the reaction temperature,time and AOS amount on the emulsion polymerization were investigated,then the most suitable polymerizing conditions were obtained.The analysis of the profiles of IR,NMR,DSC and Laser particle size demonstrated that the copolymerization occurred among St,BA and AOS to generate P（St-BA-AOS） successfully,and hydrophilic sulfonic acid groups containing the copolymer were conducive to emulsion stability.Based on the study,the influences of the dosages of AOS on the latex solid content and average particle size were discussed.The result showed that with the increase of AOS amount,the latex solid content increased and average particle size of latex reduced,e.g.,at the 2% mass amount of AOS 45.01% of the latex solid content,74 nm of aver-age diameter,0.08 of particle size distribution and 23.17 ℃ of Tg were obtained.The results of TEM showed that the copolymer emulsion with smaller particle size and more uniform size distribution could be obtained by using polymerizable emulsifier AOS instead of the same amount of sodium lauryl sulfate.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2011年第2期215-220,共6页
Acta Chimica Sinica
基金
山东省自然科学基金(No.Y2007B52)资助项目
关键词
乳液聚合
可聚合乳化剂
α-烯烃磺酸钠
丙烯酸酯
emulsion polymerization
polymerizable emulsifier
sodium alpha-olefin sulfonate
acrylate
