摘要
对Zr(Ⅳ),Al(Ⅲ),Fe(Ⅲ),Cr(Ⅲ)和Ti(Ⅳ)等高价金属离子在水溶液中的化学机理进行了研究.结果表明,高价金属离子通过水解聚合可生成多核羟桥络离子.试验证实,高价金属离子与聚丙烯酰胺(PAM)的交联体系具有最高成冻酸度,此酸度主要由体系中高价金属离子的性质所决定.PAM水解度对交联有一定影响,水解度太大或太小的PAM都不能形成冻胶,高价金属离子是以其多核羟桥络离子与PAM的羧基形成极性键和配位键产生交联的.
The chemical behavior of multivalent metal ions(Zr(Ⅳ), Al(I), Fe(Ⅱ), Cr(Ⅱ) andTi(Ⅳ)), and the crosslinking mechanism of polyacrylamide (PAM) with these ions were studied. The results showed that the hydrolyzed and polymerized multivalent metal ions roduced polynuclear olated complex ions in aqueous solutions. Crosslinking in a system can take place only in a proper pH range. The minimum gelation pH is about the same pH at which the multivalent metal ions in the system begin to be hydrolyzed. The hydrolysis level of PAM is also a key factor affecting gelation. No gel is formed at a too high or too low hydrolysis level of PAM. The crosslinking reactivity of multivalent metal ions was caused by polar and coordinate bonds formed by polynuclear olated complex ions and carboxyl groups of PAM.
出处
《石油大学学报（自然科学版）》
CSCD
1992年第3期32-39,共8页
Journal of the University of Petroleum,China(Edition of Natural Science)
关键词
金属离子
聚丙烯酰胺
交联反应
Polyacrylamide
Multivalent metal ion
Crosslink
Mechanism
