摘要
以含氢聚硅氧烷(PHMS)为助稳定剂、十二烷基硫酸钠(SDS)为乳化剂、过硫酸钾(KPS)为引发剂,研究了苯乙烯(St)体系的细乳液聚合反应动力学。比较了PHMS为助稳定剂体系与十六烷(HD)为助稳定剂体系聚合反应动力学;考察乳化剂、引发剂及PHMS用量对体系转化率的影响。结果表明:PHMS作为助稳定剂能制备出稳定的细乳液;与HD作助稳定剂体系相比较,聚合反应动力学过程的四个阶段出现较早,反应前期聚合反应速率较快,最高聚合反应速率分别是:Rp,PHMS=10.50×10-4mol·l-·1s-1,Rp.HD=6.65×10-4mol·l-·1s-1;乳化剂用量由0.5%增加到2%时,体系最终转化率由68%增大到83%;引发剂用量由0.3%增大到0.6%时,体系最终转化率由64%增大到82%;随着PHMS用量由2%增加到8%,体系最终转化率由80%降低到71%;但由8%增大到10%时,前期转化率下降而最终转化率由71%升高到75%。
The kinetics of styrene （St） miniemulsion polymerization were studied with hydrogencontaining polysiloxane （PHMS） as costabilizer, sodium dodecyl sulfate （SDS） as emulsifier, potassium persulfate （KPS） as initiator. The differences of the kinetics processes costabilized by HD, the four intervals of polymerization kinetics were arrived early, and the early polymerization rate was higher. The final conversion of the polymerization increased from 68% to 82% as increasing emulsifier concentration from 0.5% to 2% and increased fron 64% to 82% with increasing initiator concertration from 0.3% to 0.6%, while increased from 80% to 82% and then decreased from 82% to 71%. With improved PHMS concentration （2% -8% ）, the final conversion of St decreased from 80% to71%; but when raised the in miniemulsion polymerization using PHMS and hexadecane（HD） respectively as the costabilizers was compared. The effects of emulsifier concentration, PHMS concentration and initiator concentration on the polymerization conversion were also investigated. Results show that the steady monomer droplet can be prepared by using PHMS as the costabilizer. Compared to the system content of PHMS from 8% to 10%, the final conversion increased from 71% to 75%.
出处
《胶体与聚合物》
2009年第2期27-29,40,共4页
Chinese Journal of Colloid & Polymer
关键词
细乳液聚合
含氢聚硅氧烷
助稳定剂
动力学
Miniemulsion polymerization
Hydrogen-containing polysiloxane
Costabilizer
Kinetics
