Acta Chimica Sinica ›› 2002, Vol. 60 ›› Issue (4): 580-584. Previous Articles     Next Articles

Original Articles

流变学法研究部分水解聚丙烯酰胺/Cr(III)交联反应I.浓度的影响

段洪东;侯万国;孙德军;刘尚营;汪庐山;李伯耿   

  1. 浙江大学化工系高分子科学与工程研究所,杭州(310027);山东大学,济南 (250100);胜利石油管理局采油工艺研究所,东营(257000)
  • 发布日期:2002-04-15

Rheological Study of the Crosslinking Reaction between Polyacrylamide and Cr(III) I. Effect of Concentration

Duan Hongdong;Hou Wanguo;Sun Dejun;Liu Shangying;Wang Lushan;Li Bogeng   

  1. Institute of Polymer Science and Engineering, Zhejiang University, Hangzhou(310027);Key Laboratory for Colloid and Interface Chemistry of Education Ministry, Shandong University,Jinan(250100);Research Institute of Oil Production Technology, Shengli Petroleum Administration Bureau,Dongying(257000)
  • Published:2002-04-15

Rheological measurements have been performed on a system of HPAM with Cr(III) as a crosslinking agent. For the HPAM solution, the viscous modulus G" is higher than the elastic modulus G'. Both values do not change with time and the solution is a viscous system. For the crosslinking system, G' value increased and exceeded the G" value and the gelling solution displays more solid or elastic properties. The kinetics of the gelation was determined from measuring the time dependence of G'. The gelation process consists of three periods, i.e. The first increasing period, the slow increasing period and the second increasing period. The relative gelation rates of the HPAM/Cr(III) systems can be measured by using the initial G' versus time slopes to represent the rates of gelation. We found that the gelation rates increased with the concentrations of HPAM and Cr(III), and the G'-G" crossing time became shorter. We observed a first-order reaction for Cr(III) under the conditions that the carboxylate groups are in excess. The elastic effective crosslinking density of the gelling fluid increases with the polymer concentration and with the gelation process. The average molecular weight of the chains adjoining adjacent crosslinks decreases slightly with the crossliner concentration and with the gelation process.

Key words: HYDROLYSIS, POLYACRYLAMIDE, RHEOLOGICAL PROPERTY, REACTION KINETICS, GEL, CROSSLINKING

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