Synthesis, Thermal Properties and Flame Retardance of Novel Phenolic Resin/Silica Nanocomposites

摘要

The novel phenolic/silica hybrid ceramers were synthesized by sol-gel process. FTIR and ~(29)Si NMR were used to characterize the structure of the hybrids. Results revealed that Q~4, Q~3, T~3 are the major environments, i.e., it formed network structure. The thermal properties were investigated by thermogravimetric analysis (TGA). The char yields of the hybrids increase with increasing TEOS content. T_(d5) (the temperature of degradation at which weight loss is 5%) of the hybrid containing 20% TEOS content was 290℃. As the TEOS content increases to 80%, T_(d5) of the hybrid raises to 312℃. TEOS inorganic components enhance the thermal stability of hybrids. Limiting oxygen index (L.O.I.) and UL-94 test reveals that the hybrid ceramer possesses excellent flame retardance.