EFFECTS OF NONREACTIVE RESINS ON THE PROPERTIES OF A UV-CURABLE METHACRYLATED URETHANE RESIN

The effects of two nonreactive conventional-type resins, a bisphenol-A based phenoxy resin PAPHEN-301 and aromatic-based PETROLEUM RESIN, on the mechanical, thermal, and physical properties of methacrylated uret hane resin-based W-curable formulations were studied. A methacrylated urethane prepolymer was synthesized from isocyanatoethyl methacrylate (IEM) and polytetrahydrofurandiol (PTHF) via a one-step reaction. An i ncrease in PAPHEN-301 content caused an increase both in tensile stren gth and elongation values of UV-cured polymeric films. On the other ha nd, an increase in PETROLEUM RESIN content caused a decrease both in t ensile strength and elongation values of the polymeric films. However, thermooxidative properties were not affected by the introduction of e ither resin. It was also found that the water-absorption capacities of the UV-cured methacrylated urethane films depended on the type and am ount of the nonreactive resins. (C) 1998 John Wiley & Sons, Inc. J App l Polym Sci 69: 1831-1845, 1998.