Abstract
Cyclotriphosphazene-containing trihydroxy and tetrahydroxy compounds were synthesized, characterized and examined as crosslinking agents (CLA) in polyurethane systems constituted independently with polyether polyols such as polyethylene glycol (PEG), polyoxytetramethylene glycol (POTMG) and polybutadiene polyol (HTPB) and reacted with tolylene diisocyanate. The effect of the nature and concentration of the crosslinking agent on the mechanical and thermal characteristics of the polyurethane network were studied and the results were compared with a system having trimethylol propane (TMP) as crosslinking agent. The tensile strength and glass transition temperature ( T g ) increased and elongation decreased with increasing concentration of the CLA. A relative improvement in these properties was higher for the phosphazene-containing systems vis-a-vis those containing an equivalent amount of conventional CLA such as TMP. Incorporation of phosphazene slightly increased the temperature of onset of decomposition of the PU and decreased the rate of degradation at elevated temperatures.
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