摘要
选用过硫酸钾(KPS)、甲醛合次亚硫酸氢钠(SFS)和2,2’-偶氮二[2-(2-咪唑啉-2-代)丙烷]二氢氯化物(V-044)为复合引发剂,在低温下通过种子乳液聚合技术合成了生成凝聚物少的硅-丙核/壳乳液。考察了引发剂用量、乳化剂用量、有机硅用量、丙烯酸羟丙酯(HPA)用量对硅-丙核/壳乳液转化率、接枝率的影响,并借助透射电镜(TEM)、粒度分布仪和差示扫描量热仪(DSC)分别对乳胶粒形貌、粒径分布及其玻璃化转变温度(Tg)进行了表征。结果表明:当引发剂用量为1000mg·kg-1、乳化剂用量为0.8%、有机硅用量为15%、HPA用量为8%时合成的硅-丙核/壳乳液最优,乳胶粒子具有明显的核壳结构,粒径分布较窄;有机硅的加入提高了共聚物的玻璃化转变温度。
Based on seed-emulsion polymerization, the stable silicon-acralyte core/shell latex with little coagulum were synthesized at lower temperature with potassuim persulphate （KPS）, sodium formaldehyde sulfoxylate （SFS） and V-044 as composite initiators. The effects of the dosages of initiators, emulsifier, organicsilieon and 2-Hydroxypropyl acrylate（HPA） on conversion and graft efficiency were studied. Moreover, the particle morphology, particle size distribution and glass transition temperature （Tg） of latex were characterized by Transmission Electron Microscopy （TEM）, size distribution analyzer and Differential Scanning Calorimetry （DSC）. The results show that when the dosage of initiator is 1000 mg.kg^-1, dosage of emulsifier is 0.8%, dosage of silicon is 15% and dosage of HPA is 8%, the most optimum latex can be synthesized. The synthetic latex has disdinct core/shell structure and narrow size distribution; the Tg of copolymer is improved when organicsilicon is introduced.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2007年第6期1038-1043,共6页
Journal of Chemical Engineering of Chinese Universities
基金
山东省自然科学基金(Q2006B01)
关键词
硅-丙核/壳乳液
复合引发剂
核/壳结构
低温
silicon-acralyte latex
composite initiator
core/shell structure
low temperature
