Bio-based thermosetting tough polyurethanes

Novel thermosetting polyurethanes from novolac type hydroxyalkylated cardanol-formaldehyde resins, polypropylene glycols (PPG-1200 and PPG-2000) and aliphatic diisocyanates such as hexamethylene diisocyanate and isophorone diisocyanate were prepared in the form of thin sheets. The sorption, mechanical and thermal properties have been studied. The solubility parameters, molecular weight between two crosslinks of the polyurethane samples were calculated from swelling experiments. The swelling study of polyurethanes revealed that the sorption is found to decrease with an increase in chain length of PPG. The stress-strain and thermo analytical data showed the high performance character of the IPDI treated polyurethanes with respect to their mechanical and thermal properties.

Author(s): S. Gopalakrishnan  and T. Linda Fernando

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