Temperature-responsive star-shaped poly(2-ethyl-2-oxazoline) and poly(2-isopropyl-2-oxazoline) with central thiacalix[4]arene fragments: structure and properties in solutions

被引：5
|
作者：
Lezov, A. A. [1 ]
Gubarev, A. S. [1 ]
Podsevalnikova, A. N. [1 ]
Senchukova, A. S. [1 ]
Lebedeva, E. V. [1 ]
Dudkina, M. M. [2 ]
Tenkovtsev, A. V. [2 ]
Nekrasova, T. N. [2 ]
Andreeva, L. N. [2 ]
Smyslov, R. Yu. [2 ,3 ]
Gorshkova, Yu. E. [4 ]
Kopitsa, G. P. [3 ,5 ]
Radulescu, A. [6 ]
Pipich, V. [6 ]
Tsvetkov, N. V. [1 ]
机构：
[1] St Petersburg State Univ, Univ Skaya Nab 7-9, St Petersburg 199034, Russia
[2] Russian Acad Sci, Inst Macromol Cpds, Bolshoi Pr 31, St Petersburg 199004, Russia
[3] BP Konstantinov Petersburg Nucl Phys Inst NRC KI, Orlova Roscha Mcr 1, Gatchina 188300, Leningrad Regio, Russia
[4] Joint Inst Nucl Res, Joliot Curie 6, Dubna 141980, Moscow Region, Russia
[5] RAS, IV Grebenshchikov Inst Silicate Chem, Nab Makarova 2, St Petersburg 199034, Russia
[6] Forschungszentrum Julich, Julich Ctr Neutron Sci MLZ, Lichtenbergstr 1, D-85747 Garching, Germany
来源：
COLLOID AND POLYMER SCIENCE | 2019年 / 297卷 / 02期
基金：
俄罗斯科学基金会;
关键词：
Star-shaped polyoxazolines; Thiacalix[4]arene; Molecular properties; SANS; DLSAUC; ANGLE NEUTRON-SCATTERING; CRYSTAL-STRUCTURES; POLYMERS; POLY(2-OXAZOLINE)S; 2-ALKYL-2-OXAZOLINE; MACROMOLECULES; INITIATORS; PEG;
D O I：
10.1007/s00396-018-4458-9
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Temperature-responsive star-shaped poly(2-ethyl-2-oxazoline) (star-PETOX) and poly(2-isopropyl-2-oxazoline) (star-PIPOX) with arms grafted to the lower rim of thiacalix[4]arene were studied in solutions by viscometry, sedimentation velocity, light scattering, and small-angle neutron scattering. The experiments were carried out in water and tetrahydrofuran solutions. It was revealed that in tetrahydrofuran, the studied polymers were present only as individual molecules, while in aqueous solutions, in addition to individual molecules, large polymer aggregates were found. Molecular characteristics of the star-PETOX and star-PIPOX samples were estimated; their behavior in tetrahydrofuran and water was studied over a wide temperature range. It was established that a cloud point of the aqueous solution of star-PETOX (67 degrees C) is higher than that of a solution of star-PIPOX (35 degrees C). Comparison of the data obtained by dynamic light scattering and small-angle neutron scattering turned out to be fruitful in revealing all the structural levels of the organization of star-PETOX and star-PIPOX in aqueous solutions. They include the level of the individual macromolecules and the level of supramolecular organization with a star-like architecture.
引用
收藏
页码：285 / 296
页数：12
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