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From the viewpoint of recycling of bio-based resources and environmentally friendly polymers, polyurethane (PU) films and foams were prepared from diphenylmethane diisocyanate (MDI) and polyethylene glycol (PBG) with bean-curd refuse (BCR) as a polyol. Thermal and viscoelastic properties were measured by differential scanning calorimetry (DSC), thermogravimetry (TG-DTA) and dynamic mechanical analysis (DMA). Glass transition temperature (T_g) and dynamic modulus (E') of BCR-PUs increased with increasing reaction time and BCR content in polyol (BCR/Polyol). T_g and E' decreased with increasing particle size of BCR. Three dispersion peaks of α, β and γ were observed in the region from the high to low temperature in the loss modulus (E') curve. β dispersion was observed at -30 to -20℃ in BCR-PU systems solely, in contrast to that in PEG-MDI PU. Degradation temperature (T_d) of BCR-PUs decreased with increasing BCR content in polyol. CO_2 and CO are major components of the decomposed gases.
2000-01-15