Photoregulated optical switching of poly(N-isopropylacrylamide) hydrogel in aqueous solution with covalently attached spironaphthoxazine and D-π-A type pyran-based fluorescent dye

被引：35

作者：

Kim, Sung-Hoon ^{[1
]}

Hwang, In-Jeong ^{[2
]}

Gwon, Seon-Yeong ^{[1
]}

Son, Young-A ^{[3
]}

机构：

[1] Kyungpook Natl Univ, Dept Text Syst Engn, Taegu 702701, South Korea

[2] Kyungpook Natl Univ, Dept Adv Organ Mat Sci & Engn, Taegu 702701, South Korea

[3] Chungnam Natl Univ, Dept Adv Organ Mat & Text Syst Engn, Taejon 305764, South Korea

来源：

DYES AND PIGMENTS | 2010年 / 87卷 / 02期

关键词：

Photochromicswitching; Thermoresponsive; Poly(N-isopropylacrylamide); Low critical solution temperature (LCST); Hydrodynamic radius; Spironaphthoxazine; N-ISOPROPYLACRYLAMIDE; DATA STORAGE; SPIROXAZINE;

D O I：

10.1016/j.dyepig.2010.03.014

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

A thermoresponsive poly(NIPAM-co-SPO-co-fluorophore) hydrogel comprising poly(N-iso-propylacrylamide) that was partially modified using an electron donor-pi-conjugated-electron acceptor (D-pi-A) pyran-based fluorescent dye using radical copolymerization as well as a photochromic spironaphthoxazine unit displayed a lower critical solution temperature transition from 28 to 50 degrees C in aqueous solution. The poly(NIPAM-co-SPO-co-fluorophore) copolymer exhibited excellent photochromic behavior in both aqueous solution and hydrogel state. The fluorescence intensity of the poly(NIPAM-co-SPO-co-fluorophore) was temperature-dependent. The relationship between fluorescence intensity change and size of the polymer aggregates was determined using dynamic light scattering. Reversible modulation of fluorescence intensity was achieved using alternating irradiation with UV and visible light. The internal microstructure of the poly(NIPAM-co-SPO-co-fluorophore) hydrogel was investigated using SEM. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：158 / 163

页数：6

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