摘要
采用分离Cr(Ⅲ )低聚物 ,分别考察其与聚丙烯酰胺反应活性的方法 ,研究了Cr(Ⅲ )低聚物与部分水解的聚丙烯酰胺交联机理 .用离子交换色谱法分离Cr(Ⅲ )低聚物得到纯的单体、二聚体和三聚体 ,经紫外、氧化还原滴定和离子色谱法确定了它们的结构 ,分别用它们与部分水解的聚丙烯酰胺交联反应 .在pH =6～ 12 ,聚合物浓度在 30 0～ 10 0 0mg L ,交联剂Cr(Ⅲ )浓度在 2～ 2 5mg L的范围 ,对成胶因素进行对比研究 .实验结果发现二聚体成胶的pH范围宽 ,用量少 ,三聚体次之 ,单体最差 .说明Cr(Ⅲ )低聚物是成胶反应的决定步骤 ,二聚体的反应活性最高 .从而完善地阐述了Cr(Ⅲ )
The mechanism of the gelation reaction of chromium(Ⅲ) oligomers with partially hydrolyzed polyacrylamide was investigated with rheological measurements.The oligomers are prepared in relatively pure form using ion exchange liquid chromatography,characterized by UV\|visible spectra,oxidation\|reduction and ion exchange liquid chromatography,allowed to react with polymer.When pH value is in the range of 6～12,polymer concentration in the range of 300～1000 and Cr(Ⅲ) concentrations in the range of 2～25?mg/L,the effects of some components on the gelation are investigated.The results show that the advantages of the dimer are low cost and wide pH ranges,suggesting that the formation of Cr oligomer is the rate\|determining step in the gelation reaction and the simple binuclear Croligomer is the most reactive species for crosslinking.Thus the detailed mechanism is understood fully.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2001年第6期716-719,共4页
Acta Polymerica Sinica
基金
国家重点基础研究发展规划资助项目 (G19990 2 2 5 0 1)
