SULFUR-NITROGEN SYSTEMS IV. EVALUATION OF SULFAMIDE-MELAMINE-FORMALDEHYDE POLYMERS
Abstract
Acid- and base-catalyzed polymers involving sulfamide, melamine, and formaldehyde were prepared and evaluated. The products are extremely resistant to chemical attack, but their lack of thermal stability (decomposition at 225 C in N) limits their usefulness for high-temperature APPLICATIONS. Based on the relative thermal stabilities of acid- and base-catalyzed compositions, of both the ternary polymers and those from condensations of sulfamide and formaldehyde, it is suggested that acid-catalysis favors asymmetrical polymerization about the sulfamide fragment. Thermal decomposition at 225 C of the acid-catalyzed product may provide a novel polymerization route to C-N-C- polymer chains. Basic catalysis favors symmetrical polymerization around -SO2- but can produce both di- and tetra-functional sulfamide fragments in the polymerization. The reaction at 225 C of sulfamide-formaldehyde 1:4 compositions with melamine suggests that basic catalysis can lead to the inclusion of reactive methylol groups as side groups in the polymer. Thermal polymerization of melamine with these -CH2OH groups appears to occur at 225 C. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1961
- Accession Number
- AD0256811
Entities
People
- G. Barth-wehrenalp
- R.a. Florentine