Aqueous solution behavior of comb-shaped poly(2-ethyl-2-oxazoline)

被引：40

作者：

Weber, Christine ^{[1
,2
,3
]}

Rogers, Sarah ^{[4
]}

Vollrath, Antje ^{[1
,2
]}

Hoeppener, Stephanie ^{[1
,2
]}

Rudolph, Tobias ^{[1
,2
]}

Fritz, Nicole ^{[1
,2
]}

Hoogenboom, Richard ^{[5
]}

Schubert, Ulrich S. ^{[1
,2
,3
]}

机构：

[1] Univ Jena, Lab Organ & Macromol Chem IOMC, D-07743 Jena, Germany

[2] Univ Jena, JCSM, D-07743 Jena, Germany

[3] Dutch Polymer Inst, NL-5612 AB Eindhoven, Netherlands

[4] ISIS STFC Neutron Scattering Facil, Didcot OX11 0QX, Oxon, England

[5] Univ Ghent, Dept Organ Chem, Supramol Chem Grp, B-9000 Ghent, Belgium

来源：

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY | 2013年 / 51卷 / 01期

关键词：

cloud point; comb polymer; lower critical solution temperature (LCST); phase diagram; poly(2-oxazoline); small-angle neutron scattering (SANS); solution properties; stimuli sensitive polymers; ANGLE NEUTRON-SCATTERING; MULTICOMPONENT POLYMER SOLUTIONS; LIQUID PHASE SEPARATION; THERMORESPONSIVE POLYMER; RADICAL POLYMERIZATION; N-ISOPROPYLACRYLAMIDE; MOLECULAR BRUSHES; GLYCOL); POLY(N-ISOPROPYLACRYLAMIDE); POLY(2-OXAZOLINE)S;

D O I：

10.1002/pola.26332

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A series of comb polymers consisting of a methacrylate backbone and poly(2-ethyl-2-oxazoline) (PEtOx) side chains was synthesized by a combination of cationic ring-opening polymerization and reversible additionfragmentation chain transfer polymerization. Small-angle neutron scattering (SANS) studies revealed a transition from an ellipsoidal to a cylindrical conformation in D2O around a backbone degree of polymerization of 30. Comb-shaped PEtOx has lowered Tg values but a similar elution behavior in liquid chromatography under critical conditions in comparison to its linear analog was observed. The lower critical solution temperature behavior of the polymers was investigated by turbidimetry, dynamic light scattering, transmission electron microscopy, and SANS revealing decreasing Tcp in aqueous solution with increasing molar mass, the presence of very few aggregated structures below Tcp, a contraction of the macromolecules at temperatures 5 degrees C above Tcp but no severe conformational change of the cylindrical structure. In addition, the phase diagram including cloud point and coexistence curve was developed showing an LCST of 75 degrees C of the binary mixture poly[oligo(2-ethyl-2-oxazoline)methacrylate]/water. (C) 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013

引用

页码：139 / 148

页数：10

共 52 条

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