论文部分内容阅读
采用以氨解的聚(二乙烯基苯-马来酸酐)交联共聚物纳米粒子(PDVB-alt-MAH nanoparticles,PDMNPs)为稳定剂、偶氮二异丁腈为引发剂、去离子水为分散介质、苯乙烯(St)为单体构成的体系,制备出聚苯乙烯(PSt)微球.利用扫描电子显微镜、激光粒度仪等仪器考察了PSt微球的形貌和粒径,分别探讨了单体乳液的稳定性、机械搅拌速率、稳定剂用量对聚合反应的影响,结果指出超声乳化和机械搅拌是必要的工艺条件,同时,发现在0.58 wt%~11.76 wt%(g/g St)的范围内增大稳定剂用量,PSt微球产物的尺寸由200 nm减小至90 nm;利用凝胶渗透色谱对聚合过程动力学进行了追踪分析;利用红外吸收光谱、X射线光电子能谱对PSt微球的化学结构进行了表征.研究结果表明,由氨解PDMNPs稳定的超声乳化-Pickering乳液聚合体系具有如下特点:(1)PDMNPs稳定效率高;(2)超声辅助的乳化设备简单;(3)所制备的球形PSt粒子表面无皂洁净、粒径分布较窄.该聚合方法用于甲基丙烯酸甲酯(MMA)、甲基丙烯酸缩水甘油酯(GMA)和α-甲基苯乙烯(AMS)等其他常见单体的聚合,结果表明,该方法对制备油溶性单体的聚合物微球具有普适性和通用性.
Poly (divinylbenzene-maleic anhydride) cross-linked copolymer nanoparticles (PDMNPs) were used as stabilizers and azobisisobutyronitrile as initiator. Ammonia solution was (PSt) microspheres were prepared by using a dispersion medium and styrene (St) as monomers.The morphology and particle size of PSt microspheres were investigated by means of scanning electron microscopy, laser particle sizer and other instruments, respectively The stability of the monomer emulsion, the mechanical stirring rate and the amount of stabilizer on the polymerization were investigated. The results showed that the ultrasonic emulsification and mechanical stirring were the necessary process conditions. Meanwhile, it was found that the optimum conditions were 0.58 wt% ~ 11.76 wt% (g / g St ), The size of PSt microspheres decreased from 200 nm to 90 nm. The gel permeation chromatography (GPC) was used to trace the kinetics of the polymerization process. The effects of IR, X-ray photoelectron spectroscopy The chemical structure of PSt microspheres was characterized.The results show that the emulsification-Pickering emulsion polymerization system stabilized by aminolysis PDMNPs has the following characteristics: (1) high stability and stability of PDMNPs; (2) ultrasonic-assisted emulsification equipment is simple; (3) spherical PSt particles prepared The surface is soap-free and clean, and the particle size distribution is narrow. The polymerization method is applied to other common monomers such as methyl methacrylate (MMA), glycidyl methacrylate (GMA) and α-methylstyrene The results show that this method is universal and versatile for preparing polymer microspheres of oil-soluble monomers.