Abstract
Analysis of normally hydrolysis-resistant polymers, including silicone-polyesters, have recently been reported. Here we extend these methods to the analysis of condensation products of silicone-polyester resins and conventional butylated aminoplasts. Crosslinked systems employing butylated derivatives of urea-formaldehyde, melamine-formaldehyde and benzogaunamine have been degraded using an acetic acid-acetic anhydride reagent. Simultaneous hydrolysis of the polyester components and cleavage of both the ether crosslinks and the butoxy groups of the aminoplast occurred. Reaction conditions were also established where urea-formaldehyde, when used as a crosslinking agent, is simultaneously degraded using the same reagent. While the products were first examined as crosslinked condensation products, the procedures are also applicable to precondensation mixtures of the polyesters and the aminoplasts. The methods are suitable for quality control procedures.
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