摘要
在微波辐射下,进行了甲基丙烯酸甲酯(MMA)和丙烯酸丁酯(BA)的乳液共聚合。用称量法测定反应的转化率,研究反应动力学;用差示扫描量热仪(DSC)对共聚产物进行了玻璃化温度(Tg)的测试,并通过Tg计算了共聚物中MMA、BA的质量分数;采用透射电子显微镜(TEM)、激光光散射粒度仪(PCS)表征了乳胶粒形态、粒径大小及分布。结果表明,微波辐射乳液共聚合的诱导期短、反应速率快、转化率高;共聚产物只有一个Tg,并随MMA/BA质量配比的减小,Tg从91.4℃降低到-35.4℃;制得粒径小于100 nm的单分散乳胶粒;随着乳化剂浓度增大,乳胶粒水合粒径从194 nm减小到60 nm左右。
Emulsion copolymerization of MMA and BA was successfully carried out under microwave irradiation. Conversion of the monomer was determined by gravimetry and kinetics of the copolymerization was studied. The Tg of the copolymers prepared was measured by DSC and mass ratio of MMA and BA was calculated with the Tg. The morphology of the latexes was observed by TEM and the size, size distribution of the latexes was characterized by PCS. It is found that the copolymerization under microwave irradiation has higher reaction rate, higher conversion and shorter induce time than traditional heating. The copolymer has a unique Tg which decreases from 91.42℃ to -35.41℃ with the ratio variation of MMA and BA. The latexes prepared under microwave are smaller than 100 nm and monodisperse compared to those prepared by traditional heating. When the concentration of the emulsifier increases, the hydrodynamic diameters （Dh） of the latexes prepared under microwave irradiation decrease from 194 nm to 60 nm.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2008年第11期40-43,共4页
Polymer Materials Science & Engineering
基金
湖北省杰出人才基金资助项目(2004ABB003)
湖北省科技厅创新团队基金资助
关键词
微波辐射
乳液共聚合
单分散
microwave
emulsion copolymer
monodisperse
