Fluorescence from fluorescent dye‐based polyurethane ionomer(II)

Abstract

AbstractThe reaction of 6‐amino‐2(2‐hydroxy‐2‐phenyl‐ethyl)benzo[de]isoquinoline‐1,3‐dione with toluene diisocyanate and other additives to form the structure of the fluorescent dye‐based polyurethane (PU) ionomer has been proven by infrared (IR) spectroscopy. In aqueous solution, the fluorescence performance for the fluorescent dye‐based PU ionomer molecule appears at 516 nm, and its quantum yield is calculated to be 0.804. It is important to point out that increased concentration of the reactive fluorescent dye employed to prepare the fluorescent dye‐based PU ionomer molecule will not enhance the fluorescence performance of this ionomer molecule. This is probably the result of increased intra molecular interaction between ionomer molecules themselves, which may substantially reduce the excitation of the ionomer molecule by absorbing UV light. However, 6‐amino‐2‐(2‐hydroxy‐2‐phenyl‐ethyl)benzo[de]isoquinoline‐1,3‐dione is considered to be a good fluorescent dye for use in resins. Furthermore, the addition of a reactive fluorescent dye to prepare the fluorescent dye‐based PU ionomer molecule will significantly enhance the tensile strength but, however, will appreciably decrease the elongation of this ionomer molecule. Copyright © 2004 John Wiley & Sons, Ltd.