Polymers from renewable resources. XXI. Semi-interpenetrating polymer networks based on cardanol-formaldehyde-substituted aromatic compounds copolymerized resins and castor oil polyurethanes: Synthesis, structure, scanning electron microscopy and XRD

✍ Scribed by D. K. Mohapatra; P. L. Nayak; S. Lenka

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 295 KB
• Volume: 35
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(19971115)35:15<3117::aid-pola4>3.0.co;2-t

✦ Synopsis

Substituted aromatic compounds incorporated-cardanol-formaldehyde novolac resins were synthesized by acid base catalyzed reactions. A number of improved high temperature stable interpenetrating polymer networks (semi-IPNs) were prepared by condensing novolac resins and polyurethanes prepared from castor oil and diisocyanates of varying NCO/OH ratio. The structure of these semi-IPNs were studied using various characterization techniques such as IR, nuclear magnetic resonance (NMR) spectra. The scanning electron microscopy of some of the semi-IPNs have been studied and the morphology has been examined. The samples were subjected to wide angle X-ray diffraction analysis. The degree of crystallinity ( X cr ) was computed on the basis of the crystal defect concept, developed by Ruland and Vonk.