The photolysis of copolymers of methyl methacrylate and methyl acrylate

Abstract

The photolysis of copolymers of methyl acrylate and methyl methacrylate, covering the entire composition range, is studied with the copolymers in the form of film and in solution, under vacuum and in an atmosphere of oxygen. In film under vacuum, copolymers with high acrylate contents become insoluble, and cross‐linking and chain scission may be separated by application of the Charlesby‐Pinner equation to sol‐gel separation data. Otherwise, the polymer remains soluble, chain scission predominates and may be measured by the changes in number average molecular weight. Differences in the characteristics of chain scission under the four sets of conditions are accounted for in terms of physical factors, such as glass transition temperatures and “cage” recombination of radicals, and chemically in terms of the alternative reactions available to the primary radicals involved.

Characterization of acrylic resins and fluoroelastomer blends as potential materials in stone protection

“…In agreement with the literature data for acrylic resins,1, 2 the infrared and second derivative spectra of the Paraloid and their blends with Tecnoflon showed variations after this treatment at level of the aliphatic CH stretching vibrations between 3000 and 2800 cm −1 , of the –C–O–C modes (1330–900 cm −1 ) and the CO stretching vibration in the 1750–1680 cm −1 region (Figs 3 and 4).…”

“…Previous research has shown that acrylic resins and other similar compounds deteriorate over time particularly under conditions of UV radiation 1–3. Nowadays their use as protective agents for stones is therefore limited.…”

Degradation of ultra-high molecular weight poly(methyl methacrylate-co-butyl acrylate-co-acrylic acid) under ultra violet irradiation

“…8 The effect is rather signicant under the illumination of short UV wavelength. This hypothesis was proven true in many case studies involving homopolymer and similar trends were reported for copolymers such as poly(methyl methacrylateco-methyl acrylate) P[MMA-co-MA] 9 and poly(vinyl acetate-cobutyl acrylate) P[VA-co-BA].…”