13C-NMR study of the crosslinking of unsaturated polyester-styrene cured resins

✍ Scribed by M. Paci; F. Campana

• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 341 KB
• Volume: 21
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(85)90112-0

✦ Synopsis

Almract--The crosslinking (cure) of resins containing an unsaturated polyester from maleic and phthalic anhydrides and glycol mixed with styrene was investigated by 13C-NMR analysis of the hydrolysis products, as a function of the styrene monomer concentration in the resin. The t3C-NMR spectra of the copolymers between the fumarate moieties of the polyester and the styrene monomers, obtained from the hydrolysis of the ester bonds of the cured resin, revealed a pattern of resonances due to styrene ring quaternary carbon atoms; this result indicates the presence of different type of sequences in the polyester-styrene-polyester enchainments. The frequency of these enchainments depends on the styrene content in the original resin. Polystyrene bridges, i.e. (styrene),, were found to be present for every fumarate-styrene molar ratio and primarily for fumarate: styrene molar ratios ~< 1.0. An average ri value was estimated as 4.5.