摘要
通过改进的Hummers法制备氧化石墨烯(GO),以GO做稳定剂,甲基丙烯酸甲酯(MMA)为油相,制备了Pickering乳液,并研究了GO浓度、水相pH值对其稳定性的影响;通过加入引发剂成功进行了Pickering乳液聚合制备PMMA/GO复合微球,利用透射电镜对该复合微球的微观结构进行了表征。研究表明,GO稳定的Pickering乳液相比于SDBS稳定的普通乳液,液滴粒径更小且分散性更好;GO浓度对Pickering乳液的稳定性影响不大,但随其浓度的增加,Pickering乳液液滴尺寸变小,液滴更为分散;酸性连续相更有利于GO在油水界面的吸附而形成稳定的Pickering乳液,随着pH值增大,液滴尺寸逐渐变大,但碱性条件下乳液无法稳定存在;乳液聚合产物形貌为PMMA颗粒由GO片均匀包覆形成的复合微球,尺寸分布约200 nm左右。
Graphene oxide(GO) was prepared by modified Hummers method. Taking methyl methacrylate(MMA)as oil phase, the Pickering emulsion stabilized by GO was prepared, and the effect of GO concentration and pHvalue of aqueous phase on the stability of emulsion was investigated. After adding the initiator, the PMMA/GO composite microsphereswere synthesized by Pickering emulsion polymerization successfully,and the microstructure of the PMMA/GO composite microspheres was characterized by TEM. The results show that Pickering emulsion stabilized by GO possesses smaller droplets size and more excellent stability compared with the ordinary emulsion stabilized by SDBS. GO concentration has little effect on the stability of Pickering emulsion, but the droplets size decreases with the GO concentration increasing. Acid continuous phase is more advantageous to the GO sheets adsorption onto the O/W interfaces,which is conducive to stability of Pickering emulsion. The droplets size increaseswith increase of pH.However,Pickering emulsion is not stable under alkaline condition. The morphology of Pickering emulsion polymerization product was proved to be composite microspheres, PMMA particles are coated by GO sheets uniformly, and the diameter of microspheres is about 200 nm.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2014年第4期6-10,共5页
Polymer Materials Science & Engineering
基金
江苏高校优势学科建设工程资助项目
