Overlap concentration of an aqueous poly(N-vinylcaprolactam) solution in the dynamic and static states

被引：6
|
作者：
Foroutan, Masoumeh [1 ]
Khoee, Sepideh [2 ]
Zarrabi, Mona [1 ]
机构：
[1] Univ Tehran, Coll Sci, Fac Chem, Dept Phys Chem, Tehran, Iran
[2] Univ Tehran, Coll Sci, Fac Chem, Dept Polymer Chem, Tehran, Iran
来源：
JOURNAL OF APPLIED POLYMER SCIENCE | 2008年 / 109卷 / 01期
关键词：
molding; phase behavior; refractive index; viscosity; water-soluble polymers;
D O I：
10.1002/app.27935
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The overlap concentration of poly(N-vinylcaprolactam)s (PVCLs) of low molecular weights was studied with dynamic and static methods (with viscosity and refractive-index measurements) at three temperatures (25, 30, and 35 degrees C). This concentration, determined by viscometry, was lower than the overlap concentration determined by refractometry. Also, the influence of the temperature and molecular weight on the viscosity and refractive index was investigated, and the opposite effect of the temperature on the viscosity and refractive index of PVCL solutions was observed. The experimental overlap concentration values were compared with those calculated with the Rao, Huggins, and Fuoss equations. The results showed that the Huggins equation is the best equation to describe the dilute solution properties of this polymer. (c) 2008 Wiley Periodicals, Inc.
引用
收藏
页码：597 / 601
页数：5
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