Abstract
The photo-oxidative stability of photocrosslinked unsaturated polyesters endcapped with glycidyl acrylate has been investigated by measuring UV, IR and ESCA spectra of thin films and tensile properties of photocrosslinked glass fiber laminates of the polyesters without and with added stabilizers. When the resulting films and laminates are aged by irradiation in a UV-CON irradiator for various lengths of time, surface oxidation occurs to a certain level. The addition of 0·15–0·30% hindered amine stabilizer based on 2,2,6,6-tetramethylpiperidine, TINUVIN-770, TINUVIN-292 and TINUVIN-144 to the resins before crosslinking decreases the rate of surface oxidation and prevents the decrease in tensile strength that occurs due to aging without the addition of the stabilizers. TINUVIN-770 with NH groups is found to provide higher levels of stabilization in the UV crosslinked unsaturated polyester system than the other two stabilizers with NCH 3 groups, especially during the early stages of irradiation.
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