Birefringence in solutions and films of poly(N-methyl-N-vinylacetamide) macromolecules

被引：2
|
作者：
Pavlov, G. M. [1 ,2 ]
Kolbina, G. F. [1 ]
Mikhailova, N. A. [2 ]
Gavrilova, I. I. [1 ]
Panarin, E. F. [1 ,3 ]
机构：
[1] Russian Acad Sci, Inst Macromol Cpds, St Petersburg 199004, Russia
[2] St Petersburg State Univ, Fock Inst Phys, St Petersburg 198504, Russia
[3] St Petersburg State Polytech Univ, St Petersburg 195251, Russia
来源：
POLYMER SCIENCE SERIES A | 2015年 / 57卷 / 03期
关键词：
SURFACE-LAYERS; MOLECULES;
D O I：
10.1134/S0965545X15030116
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 flow birefringence of aqueous solutions of poly(N-methyl-N-vinylacetamide) macromolecules for samples of various molecular masses is studied. It is found that the sign of birefringence changes from positive to negative with a decrease in molecular mass in accordance with the manifestation of the macroform effect on condition that the value of the inherent optical anisotropy of macromolecules is negative. With the use of the macroform-effect theory in the Maxwell phenomenon of polymer solutions, the inherent optical anisotropy of the repeating polymer unit is estimated as (a (aEuro-)-a (aSyen)) = -(5 +/- 1) x 10(-25) cm(3). In turn, the value of (a (aEuro-)-a (aSyen)) makes it possible to separate structural and orientational contributions to the effect of spontaneous birefringence for films of various thicknesses that are cast from aqueous solutions of poly(N-methyl-N-vinylacetamide). The parameter of orientational order of chain fragments for this polymer in the near-surface layers of the films is -(0.05 +/- 0.01).
引用
收藏
页码：261 / 265
页数：5
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