Halochromism and Mechanical Study of the Rhodamine-End-CappedPolyurethane

In the follwing work, pH-responsive polyurethanes (PUs) were synthesized using a rhodamine Bderivative (RhBEA) as a halochromic agent. Proton nuclear magnetic resonance was used to confirmthe chemical structure of RhBEA. The chemical structure and hydrogen bonding content of PUs wereinvestigated by Fourier transform infrared spectroscopy. The mechanical properties of different PUswere determined. The results indicate a decrease in Young’s modulus for the PU sample containing۳ wt.% of RhBEA (PU-RhB ۳%) due to the hydrogen bonding interaction between RhBEA and thestructure of PU. Moreover, PU-RhB ۳% could change its color upon exposure to an acidic solution.

کلیدواژه ها:

Polyurethane ، rhodamine B ، halochromic ، pH-responsive