双官能度引发剂引发丙烯酰胺聚合研究

Study on Polymerization of Acrylamid Initiated by Di-Functionality Initiator

选用2,5-二甲基-2,5-己二醇和过氧化氢在浓硫酸作催化剂条件下反应制备2,5-二甲基-己二基(2,5)-双过氧化氢,作为双官能度引发剂。并用制备出的引发剂与Na2SO3组成氧化还原体系,引发丙烯酰胺聚合。分子量随引发剂浓度和反应起始温度的增加而降低;随单体浓度的增加先增加后降低,在单体初始质量分数为25%,2,5-二甲基-2,5-己二醇浓度为5×10-5mol/L,反应起始温度为10℃的条件下,制备出分子量达到2600万左右的聚丙烯酰胺。

In the presence of concentrated sulfuric acid as catalyst, 2,5-dimethyl-2, 5-hexanediol was reacted with hydrogen peroxide to form 2,5-Dihydroperoxy-2,5-dimethylhexane as di-functional initiator. This initiator, with sodium sulfite, constituted an oxidation-reduction system, which is used for the polymerization of acrylamid. It shows that the molecular weight of polyacrylamid decreases when increasing the initiator Concentration or raising the initial reaction temperature. By increasing monomer concentration, the molecular weight increases first then decreases. At the monomer concentration of 25 %, initiator concentration of 5 × 10^-5 mol/L, and initial reaction temperature of 10℃, the molecular weight of the polyacrylamid is 2.6 × 10^6.