UV and EB curing properties of polyol polyacrylates.

Abstract

Japan) UV-and EB-curing properties of various polyol polyacrylates were investigated by the measurements of surfacehardening and conversion of acryloyloxy groups and by ESR spectra. Surface-curability was different for each polyol polyacrylates when the UV-curing process was carried out in air. This behavior was caused by the inhibition effect of oxygen at the surface of polyol polyacrylate layer, which was assumed to be related with the structure of polyols. Especially polyol polyacrylates with the skeleton of pentaerythritol were superior in surface-curability to those with the skeleton of trimethylolpropane. On the other hand, there was almost no difference in surface-curability for EB-curing among the polyol polyacrylates. About 0.4 Mrad dosage caused the surface of the polyol polyacrylate layer to harden. By ESR apectoscopic analysis, it was confirmed that the accumulation of stable radicals and the formation of polymer networks progressed simultaneously. KEY WORDS Acrylate/PolyolPolyacrylate/Surface-Curability/ES/UV/Inhibition/Oxygen/

Analysis of synthetic polymers

“…Secondary ion mass spectrometry (SIMS) was reviewed in depth ( 135) as were the elimination of matrix effects ( 136), the fragmentation of acrylic and methacrylic homopolymers (137), and the characterization of asbestos fiber surfaces (138). Other studies of interest to the coatings analyst, reported during this period, include the use of low energy electron diffraction (LEED) to study surface structure ( 139), the use of electron spin resonance (ESR) to examine the UV and electron beam curing properties of polyol polyacrylates (140), and small angle neutron scattering (SANS) from interfacially polymerized core-shell latices (141).…”