Oxidation of bisphenol a polymers

Abstract

SynopsisPolysulfone, polycarbonate, and phenoxy resins were aged under thermal and ultraviolet light conditions. Thermooxidative processes in polysulfone and polycarbonate are of such minor significance as not to impart noticeable losses in these materials below 125°C. I n phenoxy, however, thermal oxidation above 100°C results in rapid deterioration of all physical properties. This probably results from the low glass transition temperature of this polymer. Photo-oxidation rapidly degrades polysulfone. This appears to be a consequence of scission a t the sulfone link. In polycarbonate, however, the only serious result of short-term irradiation is discoloration. For phenoxy resin, crosslinking through reactions a t the hydroxyl group is the principal result of photooxidation. In all processes the bisphenol A portion of the three polymers appears to play only a small role.

PVD coating for optical applications on temperature-resistant thermoplastics

“…Fig. 3 shows the difference of FTIR-ATR spectra before and after irradiation, the strong increase of the hydroxyl absorption (between 3000cm' and 3500cm') is consistent with the literature [24] and indicates chain scission and photo-oxidation reactions. Because of the relatively high penetration depth of the global UV-radiation (X>290nm) compared to the radiation of the mercury lamp, the absorption of the 1 ,5mm thick substrate rose after 24h irradiation about 20% at 420nm wavelength.…”

Polymer Degradation and Stabilization

“…An alternative mechanism for photodegradation of polycarbonates is based on oxidation reactions [86][87][88]. Recently, Factor and Chu 89) have confirmed the important role which oxidation plays in the photo degradation of polycarbonates during outdoor weathering, particularly under accelerated exposure conditions.…”

Ultraviolet surface treatment for adhesion strength improvement of carbon/epoxy composite

“…Kelleher and Gesner [4,5] studied the photolysis and photo-oxidation of phenoxy resin and suggested some possible schemes of photo-oxidation. George et al [6] investigated the photo-oxidation and weathering stability of epoxy resin for a commercial composite laminate.…”