Preparation and characterization of a photochromic hydrogel Preparation and characterization of a photochromic hydrogel

Preparation and characterization of a photochromic hydrogel

Chen Mo, Lin Lin, Li Xiaoqiang

1North China Institute of Science and Technology, East Yanjiao, Beijing 101601, China

2School of Food & Biological Engineering, Jiangsu University, Zhenjiang 212013 P.R. China

3Departments of Mechanical Engineering, Ibaraki University (College of Engineering), Hitachi, Ibaraki 316 8511, Japan

Adv. Mater. Lett., 2011, 2 (6), pp 415-418

DOI: 10.5185/amlett.2011.2227

Publication Date (Web): Apr 08, 2012

E-mail: leecaiwei@163.com, xiaoqingli@mx.ibaraki.ac.jp

Abstract


A new type of photochromic hydrogel, spiropyran (SP)-Polyvinylpyrrolidone (PVP)-poly (N-isopropyl acrylamide) (PNIPAM) hydrogel with functionalized SP chemically incorporated, was synthesized. The molecular structure of synthesized products was given by nuclear magnetic resonance (NMR) spectra and infrared spectrum (IR). The photochromism of the hydrogel was evidenced by photography and characterized by ultraviolet-visible (UV-Vis) spectroscopy. The photochromic reversibility of the hydrogel was tested through observing its responses to the alternating UV irradiation to dark environment. The fluorescence micrographs showed the fluorescent effect as well as confirmed the photochromic properties of the hydrogel, and indicated that the chemical incorporation made the functionalized SP distribute well in the gel.

Keywords

Photochromism, polymeric hydrogel, spiropyran

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