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In order to understand the effect of flame retardant (FR) and blowing agents on the thermal stability of rigid polyurethane foams and their resultant chars, two series of polyurethane foams produced with different blowing agents (HCFC-141b and pentane) and various concentrations of a FR (0-50wt%) were investigated using standard flammability test (ASTM, D-3014), solid-state 13 C NMR,...
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