Development and Characterization of Boron Incorporated Linseed Oil Polyurethanes

The aim of this work was to investigate the structures and properties of boron incorporated linseed oil polyols (BPEPs) and their polyurethanes (BPEPUs). Hydroxylation was performed in situ using H2O2 and acetic acid; the syntheses of BPEPs and BPEPUs involves polyesterification and polyaddition reactions following "single-pot, multi-step" reactions strategy. Spectral (IR, H-1-NMR, and C-13-NMR), physicochemical, thermal (TGA, DSC), physico-mechanical analyses and corrosion/chemical resistance performance of aforementioned resins confirmed the incorporation of boron in polyol and polyurethane backbone. BPEPUs followed a clear Cut "three step-ambient temperature" curing strategy. They showed very good resistance to 5 wt % HCl, 3.5 wt %, NaCl (Unaffected for 16 and 14 clays, respectively), moderate alkali resistance and moderate to good antibacterial activity against E. coli and S. aureus. Our investigations reveal that (i) the incorporation of boron has significant influence on the structural, physicochemical aspects, physico-mechanical, chemical resistance behavior, and thermal stability of polyurethanes, (ii) boron linkages play dual role, both as cross linker and modifier, and (iii) BPEPUs may serve as efficient corrosion protective material, which may be safely employed upto 230 degrees C. (C) 2009 V Periodicals, Inc. J Appl Polym Sci 116: 499-508, 2010