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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 to produce polymer particles was explored.Methods: The polymer particles were prepared by injecting carbon dioxide into the autoclave autoclave simultaneously with polyethylene glycol diacrylate and The photoinitiator solution, the solution and the carbon dioxide form a uniform spray and further forms the dispersion system with the supercritical carbon dioxide through the action of the antisolvent. When the ultraviolet irradiation is performed simultaneously, the monomer can undergo photopolymerization in the supercritical carbon dioxide. As a result, The method is feasible and the polymer microparticles are obtained.The effects of different solvents and the amount of reaction raw materials on the particle size distribution of the product are studied.The use of different solvents will change the solubility of the reaction raw materials and products in supercritical carbon dioxide, Particle size distribution; the amount of reactive raw materials increased, its solubility in supercritical carbon dioxide decreases, resulting in a wide distribution of product particle size.