Thermal, mechanical, and morphological properties of novolac-type phenolicresin blended with fullerenol polyurethane and linear polyurethane

Fullerenol polyurethane (C-60-PU) and linear polyurethane (linear-PU) modif ied phenolic resins were prepared in this study. Phenolic resin/C-60-PU and phenolic resin/linear-PU blends show good miscibility as a result of the i ntermolecular hydrogen bonding existing between phenolic resin and PU modif iers. DSC and thermogravimetric analysis methods were used to study the the rmal properties of phenolic resin blended with different types of PUS. The intermolecular hydrogen bonding that existed between phenolic resin and C-6 0-PU was investigated by Fourier transform infrared spectroscopy. The morph ology and mechanical properties of phenolic resin/C-60-PU and phenolic resi n/linear-PU blends were also investigated. The char yield of the modified p henolic resins decreased with increasing PU modifier content. Significant i mprovement in the toughness of the modified phenolic resins was observed. T he improvements of impact strength were 27.4% for the phenolic resin/linear -PU system and 54.3% for the phenolic resin/C-60-PU system, respectively, b oth with 3 phr linear-PU and C-60-PU content. (C) 2001 John Wiley & Sons, I nc.