Time dependence of the aggregation of star-shaped poly(2-isopropyl-2-oxazolines) in aqueous solutions

被引：29
作者：
Amirova, Alina [1 ]
Rodchenko, Serafim [2 ]
Filippov, Alexander [1 ]
机构：
[1] Russian Acad Sci, Inst Macromol Cpds, Bolshoy Pr 31, St Petersburg 199004, Russia
[2] St Petersburg Natl Res Univ Informat Technol Mech, Kronverkskiy Pr 49, St Petersburg 197101, Russia
来源：
JOURNAL OF POLYMER RESEARCH | 2016年 / 23卷 / 11期
基金：
俄罗斯科学基金会;
关键词：
Thermosensitive polymer; Kinetic; poly(2-isopropyl-2-oxazolines); Phase separation; Aggregation; BLOCK-COPOLYMERS; POLYMERS; KINETICS; POLY(2-ALKYL-2-OXAZOLINE)S; POLYOXAZOLINES; SCATTERING; MICELLES; NUMBER;
D O I：
10.1007/s10965-016-1112-4
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 paper concerns the analysis of time t(eq) required to equilibrium state achievement in aqueous solutions of star-shaped poly(2-isopropyl-2-oxazolines) (PiPrOx) after changing temperature. The discussed data were obtained for PiPrOx differing in arm number and length. For all samples, high t(eq) values, half an hour at least, were obtained because of rather high intramolecular density. The dependence t(eq) on temperature displayed maximum near the phase separation beginning due to the aggregate growth and redistribution of scattering particles. The maximum times t(eq) increased symbatically with arm number and length. The higher energy of the hydrogen bond formed by deuterium isotope leads to the growth of the t(eq) values as compared to solutions in H2O.
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页数：9
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