Synthesis and Anthocyanin Based Halochromic Effects of Polyurethanes

Thermoplastic polyurethanes (TPUs) with halochromic effects have a wide range of applicationsincluding sensors, food packaging, and wound dressings. In this study, TPU was synthesized usingpolycaprolactone (PCL) and polyethylene glycol (PEG) as soft segments, and hexamethylenediisocyanates (HDI) and ۱,۴-butanediol (BDO) as hard segments. The halochromic TPU wasprepared by physically dispersing extracted anthocyanin dyes from red cabbage. The chemicalstructures of anthocyanin and TPUs were studied by Fourier transform infrared (FTIR) spectroscopyand the mechanical properties of TPUs were examined by tensile test. Halochromic effects wereinvestigated by imaging the anthocyanin and PU-AC after immersing them in different pH solutions.

کلیدواژه ها:

pH sensitive polymer ، Halochromic ، TPU ، Anthocyanin