聚乙二醇双丙烯酸酯在超临界二氧化碳中的光聚合研究

PHOTOPOLYMERIZATION OF POLY(ETHYLENE GLYCOL) DIACRYLATE IN SUPERCRITICAL CARBON DIOXIDE

探索了聚乙二醇双丙烯酸酯在超临界二氧化碳中发生光聚合反应制备聚合物颗粒的过程.方法为向充满超临界二氧化碳的高压反应釜中,同时喷射二氧化碳与聚乙二醇双丙烯酸酯及光引发剂的溶液,溶液与二氧化碳形成均匀的喷雾并进一步通过反溶剂作用与超临界二氧化碳形成分散体系,当同步进行紫外光照射时,单体可以在超临界二氧化碳中发生光聚合.结果证明此方法是可行的,得到了聚合物微颗粒.研究了不同溶剂及反应原料用量对产物粒径分布的影响.采用不同溶剂,将改变反应原料及产物在超临界二氧化碳中的溶解度,进而改变产物的粒径分布;反应原料用量增加,其在超临界二氧化碳中的溶解度减小,导致产物粒径分布较宽。

The process of photopolymerization of polyethylene glycol diacrylate in supercritical carbon dioxide system was explored.Supercritical carbon dioxide was obtained in a high pressure chamber by adding carbon dioxide into the chamber and adjusting the temperature and pressure befittingly.Then carbon dioxide,and solution of reactive monomer and photo initiator were sprayed simultaneously into the high pressure chamber to form mist of the reactants interacting with carbon dioxide,and the further uniform dispersion system of reactant in supercritical carbon dioxide could be got by anti solvent effect.The results showed that the photopolymerization of active monomer in supercritical carbon dioxide performed successfully under irradiation of UV light resource as prospected and crosslinked polymer microparticles were produced.Furthermore,the relationship of the kind of solvent,the quantity of the reactants with the distribution properties of the microparticle size was investigated.It could be seen that the distribution of the microparticle size broadened with the decreasing of the solubility of the reactants in supercritical carbon dioxide which was caused by the larger polarity of the solvent and the poor solubility of the solvent in supercritical carbon dioxide.The results also showed that the distribution of the microparticle size increased with the increasing of quantity of the reactants.