粘度法研究胶态分散凝胶交联过程

通过粘度测定方法，研究了部分水解聚丙烯酰胺（ＨＰＡＭ）／ 柠檬酸铝（ＡｌＣｉｔ） 交联过程中粘度变化的特性．聚合物浓度高的ＨＰＡＭ／ＡｌＣｉｔ 体系粘度随反应时间的延长而上升，其体系粘度最终高于相同聚合物浓度的ＨＰＡＭ 溶液粘度．聚合物浓度低的ＨＰＡＭ／ＡｌＣｉｔ 体系粘度随反应时间的延长而下降，其体系粘度低于相同聚合物浓度的ＨＰＡＭ 溶液粘度．ＨＰＡＭ／ＡｌＣｉｔ 交联体系的聚合物浓度低于临界浓度时，交联反应后形成稀胶态分散凝胶（ＴＣＤＧ） ．在实验条件下，临界浓度在１５０ ～３００ｍｇ／Ｌ 之间．当聚合物浓度于临界浓度和７００ｍｇ／Ｌ之间时，形成浓胶态分散凝胶（ＣＣＤＧ） ；当聚合物浓度高于７００ｍｇ／Ｌ 时，ＨＰＡＭ／ＡｌＣｉｔ 交联体系形成整体凝胶．

STUDY ON GELATION OF POLYACRYLAMIDE/ ALUMINUM CITRATE COLLOIDAL DISPERSION GEL BY MEASUREMENT OF VISCOSITY

Viscosity of partially hydrolyzed polyacrylamide (HPAM)/aluminum citrate (AlCit) colloidal dispersion gel has been measured in gelation of the system. The result showed that the viscosity of HPAM/AlCit cross\|linking system increased with reaction time when the concentration of HPAM is higher, and the final viscosity of the system is higher than the viscosity of HPAM solution with same concentration of HPAM. The viscosity of HPAM/AlCit cross\|linking system is decreased with reaction time when the concentration of HPAM is lower, and the final viscosity of the system is lower than the viscosity of HPAM solution with same concentration of HPAM. When the concentration of HPAM lower than critical concentration the HPAM/AlCit cross\|linking system formed thin colloidal dispersion gel (TCDG).Under the experimental condition, the critical concentration of HPAM is between 150 and 300 mg/L. When the concentration of HPAM is between the critical concentration and 700 mg/L the HPAM/AlCit cross\|linking system formed concentrated colloidal dispersion gel (CCDG). When the concentration of HPAM is higher than 700mg/L the HPAM/AlCit cross\|linking system formed bulk gel.