Semi-interpenetrating polymer networks from castor oil-based polyurethane and nitrokonjac glucomannan

摘要: New semi-interpenetrating polymer networks (semi-IPNs) coded as PUNK were successfully synthesized from castor oil-based polyurethane (PU) prepolymer and 10–40 wt % nitrokonjac glucomannan (NKGM) containing a degree of substitution 2.4 weight-average molecular weight 4.75 × 104. The semi-IPN sheets that 100 μm thick cured more speedily than PU, with curing times 5 h for 16 PU at 50–70°C. structure miscibility the studied by Fourier transform infrared spectroscopy, ultraviolet scanning electron microscopy. results showed strong intermolecular interaction caused hydrogen bonding between NKGM exists in PUNK, resulting good miscibility. When content semi-IPNs was 20 %, tensile strength light transmittance obviously higher sheets. plays an important role not only accelerating cure but also improving mechanical properties biodegradability. As new material prepared renewable resources, has potential applications because its © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 2076–2083,