Abstract
This paper describes novel methods of producing modified isocyanurate foams having low combustibility, high thermal stability and low smoke density.
The research philosophy in this study is based on a hypothesis that by increasing the thermal stability of polymeric linkages, less flammable gases are generated which result in foams having lower combustibility, higher flame resistance, and higher thermal stability.
The thermally-stable linkages employed in this study are amide-, imide-, and imide/carbodiimide linkages.
Amide-modified isocyanurate foams were prepared by either a one step process or a two step process, using dimer acid, adipic acid or di-ketimine as modifier. The foams prepared by the two step process using adipic acid exhibited high closed cell content and therefore higher thermal insulation and high temperature stability.
Imide-modified isocyanurate foams exhibited high flame-resistance and high closed cell content.
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