文献类型：期刊文献

英文题名：Viscoelastic behavior of AN-g-casein copolymer concentrated solution of sodium thiocyanate

作者：Dong, QZ; Gu, LX

机构：[1]E China Univ Sci & Technol, Petrochem Inst, Shanghai 201512, Peoples R China;[2]Dong Hua Univ, Man Made Fiber Res Inst, Shanghai, Peoples R China;[3]Dong Hua Univ, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai, Peoples R China

年份：2002

卷号：84

期号：9

起止页码：1721

外文期刊名：JOURNAL OF APPLIED POLYMER SCIENCE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000174469000010)】；

语种：英文

外文关键词：acrylonitrile; casein; graft copolymer; sodium thiocyanate; viscoelastic properties; shear; stress; swelling; rheology

摘要：The viscoelastic behavior of sodium thiocyanate concentrated solution of graft copolymer of acrylonitrile onto casein (AN-g-casein) was investigated in detail by nitrogen pressure capillary rheometer. The experimental results show that the concentrated solution of AN-g-casein is a non-Newtonian fluid of shear thinning. The end correction increases with the increase of shear rate. In the course of practical spinning, the real shear stress only attributes about 35% to the apparent shear stress, which confirms the essentiality of end correction for the capillary extrusion of the concentrated solution of the graft copolymer. By using the Dewitt model, the Couette correction and recoverable shear strain S-R were analyzed and separated. Quantitative function relation of xi and S-R versus shear rate and temperature were deduced. It is a common equation within the range of experiment. In practical spinning process, the real viscoelastic parameters can be easily predicted by only a piece of flowing curve based on the common equation. Real elastic model G under any shear rate in the range of experiment was calculated. It was found that G increases with an increase of shear rate, which is opposite to the conclusion reported by Hayahara. The main reason for the error may be that Hayahara used the same Couette correction at a higher shear rate. Further, the die swell in the spinning process can be estimated efficiently. The theoretical base for the stability of AN-g-casein spinning technology was provided. (C) 2002 Wiley Periodicals, Inc.