Synthesis and characterization of new pH- and thermo-responsive hydrogels based on N-isopropylacrylamide and 2-oxazolines

被引：14

作者：

Carlos Rueda, Juan ^{[1
]}

Campos, Estuardo ^{[1
]}

Komber, Hartmut ^{[2
]}

Zschoche, Stefan ^{[2
]}

Haeussler, Liane ^{[2
]}

Voit, Brigitte ^{[2
]}

机构：

[1] PUCP, Lab Polimeros, Secc Fis, DGI, Lima, Peru

[2] Leibniz Inst Polymer Res Dresden, D-01069 Dresden, Germany

来源：

DESIGNED MONOMERS AND POLYMERS | 2014年 / 17卷 / 03期

关键词：

hydrogels; stimuli-sensitive polymers; networks; graft copolymers; macromonomers; swelling; GRAFT-COPOLYMERS; POLY(N-ISOPROPYLACRYLAMIDE); POLYMERIZATION; TEMPERATURE;

D O I：

10.1080/15685551.2013.840471

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

New pH- and thermo-responsive hydrogels (HG) were synthesized by free radical polymerization of N-isopropylacrylamide and a macromonomer, which was a hydrolyzed random copolymer of 2-carboxyethyl- and 2-methyl-2-oxazoline, using a bisacrylamide as crosslinker. The polymerization was carried out in a mixture of water and ethanol at room temperature and was initiated by ammonium peroxodisulfate. The HG showed conformational transitions with variation of temperature and/or pH-value and as a function of hydrogel composition. This property was shown macroscopically as hydrogel contraction or expansion. The HG structures were characterized by high-resolution magic angle spinning (HRMAS) NMR spectroscopy. The thermal properties, in particular the lower critical solution temperatures, were determined by temperature-dependent HRMAS NMR measurements and differential scanning calorimetry. The pH responsibility was determined by swelling experiments in water at different pH values.

引用

页码：208 / 216

页数：9

共 38 条

[1] Polymerization of oxazolines [J].