Behavior of protein-like N-vinylcaprolactam and N-vinylimidazole copolymers in aqueous solutions

被引：13
|
作者：
Lozinsky, V. I.
Simenel, I. A.
Semenova, M. G.
Belyakova, L. E.
Il'in, M. M.
Grinberg, V. Ya.
Dubovik, A. S.
Khokhlov, A. R.
机构：
[1] Russian Acad Sci, AN Nesmeyanov Organoelement Cpds Inst, Moscow 119991, Russia
[2] Russian Acad Sci, Emanuel Inst Biochem Phys, Moscow 119991, Russia
[3] Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119992, Russia
来源：
POLYMER SCIENCE SERIES A | 2006年 / 48卷 / 04期
关键词：
D O I：
10.1134/S0965545X06040134
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 free-radical copolymerization of N-vinylcaprolactam and N-vinylimidazole (at an initial comonomer ratio of 85: 15, mol/mol) initiated by a persulfate-tertiary amine redox system in 10% aqueous DMSO at 25 and 65 degrees C (at temperatures below and above the temperature of phase separation in the reaction system, respectively) yielded macromolecular products that were subsequently separated into thermally precipitating and nonprecipitating fractions. Investigations of these fractions by capillary viscometry, static and dynamic laser light scattering, and high-sensitivity DSC showed that macromolecules of both types of copolymers are strongly associated in aqueous solutions. Upon heating of solutions of thermally nonprecipitating fractions, additional aggregation takes place and this phenomenon is accompanied by a decrease in the size of particles without loss in their solubility until at least 70 degrees C is reached. As for the set of properties exhibited in aqueous solutions, the thermally nonprecipitating fraction of the copolymer synthesized at 65 degrees C may be assigned to protein-like macromolecules.
引用
收藏
页码：435 / 443
页数：9
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