沉淀聚合法制备窄分散聚(甲基丙烯酸缩水甘油酯-co-乙二醇二甲基丙烯酸酯)功能聚合物微球

以偶氮二异丁腈(AIBN)为引发剂,甲基丙烯酸缩水甘油酯(GMA)和乙二醇二甲基丙烯酸酯(EGDMA)为共聚单体,采用沉淀聚合法制备了不同交联度的窄分散聚合物微球,考察了共聚单体对聚合物微球粒度、分散性以及产率的影响,并用扫描电镜(SEM)和红外光谱对微球进行了表征,SEM结果显示当EGDMA的比例在40mol%～70mol%之间时,可得到单分散的poly-(GMA-co-EGDMA)微球.

NARROW-DISPERSE POLY(GLYCIDYL METHACRYLATE-co-ETHYLENE GLYCOL DIMETHACRYLATE) MICROSPHERES via PRECIPITATION POLYMERIZATION

Narrow-dispersion or monodisperse poly-(glycidyl methacrylate-co-ethylene glycol dimethacrylate)(poly-(GMA-co-EGDMA))microspheres with stable and smooth surface and particle size in the range of 1.1～3.2 μm were prepared by precipitation polymerization in neat acetonitrile in the absence of any stabilizer and with 2,2'-azobisisobutyronitrile(AIBN)as initiator.The comonomer feed ratio has much effect on the morphology and the size of the resultant polymer particles.As the EGDMA content increased from 20 mol% to 90 mol%,the yield increased from 5.5% to 81.3%,while the particle size had a tendency to decrease with the EGDMA content.The SEM images indicated that the monodisperse microspheres were obtained with EGDMA fraction in comonomer loading from 40 mol% to 70 mol%.The FT-IR spectrum showed the characteristic peaks at 1725～908 cm-1 assigned to the confirmation of the polymerization between GMA and EGDMA.