文献类型：会议论文

中文题名：Determination of time for blank solution of ammonium polyphosphates to flow through the capillary in Ubbelohde viscometer

作者：Hongyu Zhao[1];Gousheng Liu[1];Lijuan Wang[1];Jun Meng[1];Jianguo Yu[1];

机构：[1]Institute of Resources Process Engineering, East China University of Science and Technology,No. 130 Meilong Rd, Shanghai, China, 200237;

会议论文集：The 12th Asian Pacific Confederation of Chemical Engineering Congress(第十二届亚太化工联盟大会暨化工展览会)论文集

会议日期：20080804

会议地点：大连

主办单位：中国化工学会;中国化工企业管理协会;中国石油和化学工业协会

语种：英文

中文关键词：Ubbelohde viscometer;Viscometry;Ammonium polyphosphates;Quadratic extrapolation

摘要：While polymer solution flows through the capillary of Ubbelohde viscometer,adsorption of polymer to the surface, sometimes, seriously change the physical and chemical nature of the surface. The effective diameter is narrowed. Thus, the time for blank solution to flow through the capillary is different before and after measuring time of the solution of varied concentration, making the average molecular weight strikingly different. Despite the importance of the time for blank solution, no uniformly adopted method has been established to determine it. However, for the currently used methods , η sp/c is no longer the linear function of c (g/100ml) as the concentration decreases. In this paper, solution of a wide range of low concentration is prepared (5.0×10 -4 ～5.0×10 -3 g/ml), and the addition of electrolyte is considered. A new method to determine the time for blank solution is proposed. Experimental data and theoretical analysis show that this method is more applicable and accurate, making η sp/c the linear function of c(g/100ml) at wider range of low concentration.