微波辐照下聚硅氧烷微乳液的制备及动力学研究

以八甲基环四硅氧烷(D4)为原料,十二烷基苯磺酸(DBSA)为催化剂,十二烷基苯磺酸钠(SDBS)和聚乙二醇辛基苯基醚(OP-10)为复配乳化剂,在微波辐照下制备聚硅氧烷微乳液。讨论了反应条件对微乳液制备的影响,结果表明,反应温度80℃,D4、DBSA、SDBS和OP-10分别为微乳液质量的15%,3%,4%和1%时微乳液的流体力学半径最小。进一步研究了反应条件对反应动力学的影响,结果表明,温度越高,催化剂用量越大,D4转化速率越快,但最终的平衡转化率接近。

Study on preparation and polymerization kinetics of silicone microemulsion under microwave irradiation

The polysiloxane microemulsion was prepared by microemulsion polymerization of octamethylcyclotetrasiloxane(D4) under microwave irradiation using dodecyl benzene sulfonic acid(DBSA) as catalyst and the sodium dodecyl benzene sulfonate(SDBS) and polyethylene glycol octyl phenylether(OP-10) as emulsifier.The effect of the content of catalyst,emulsifiers and D4 on the preparation of silicone microemulsion was discussed.The results showed that when the temperature was 80 ℃ and the content of D4,DBSA,SDBS,OP-10 were 15%,3%,4%,1% of the mass of microemulsion,respectively,the hydrodynamic radius of colloidal particle is the smallest.Furthermore,the research of polymerization kinetics of silicone microemulsion under microwave irradiation was carried out and the results show that the higher temperature and more content of catalyst are favorable to speed up transformation of D4.