Thermo- and pH-Sensitivities of Thiosemicarbazone-Incorporated, Fluorescent and Amphiphilic Poly(N-isopropylacrylamide)

✍ Scribed by Cheng Li; Ling-Zhi Meng; Xiao-Ju Lu; Zhao-Qiang Wu; Li-Fen Zhang; Yong-Bing He

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 150 KB
• Volume: 206
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.200500222

✦ Synopsis

Abstract

Summary: Novel hydrophobic comonomer (p‐methacrylamido)acetophenone thiosemicarbazone was synthesized and polymerized with N‐isopropylacrylamide to get a series of amphiphilic copolymers. The self‐aggregation behavior and thermo‐sensitive character of the (co)polymers were confirmed by TEM observation, fluorescence spectra, and cloud point measurement. Fluorescence emission of copolymer was significantly strengthened or switched off at an excitation wavelength of 320 nm upon the addition of acid or base, respectively. Thermo‐sensitivity, pH‐sensitivity, and pharmacologically versatile thiosemicarbazone groups were integrated into these novel fluorescent and amphiphilic copolymers, which will develop the novel applications of amphiphilic copolymer and environment‐responsive materials.

Fluorescence intensity at 393 nm of polymer 2 in water at 18 °C excited at 320 nm upon addition of acid and base.

imageFluorescence intensity at 393 nm of polymer 2 in water at 18 °C excited at 320 nm upon addition of acid and base.