Mechanical Properties, Thermal Stability, and Flame Retardance of Novolac-Type Phenolic Resin Blended with Poly(dimethylsiloxaneadipamide)

摘要

Mechanical properties (flexural strength, flexural modulus, and notched Izod impact strength), thermal stability, and flame retardance ofpoly(dimethylsiloxane adipamide) (PDMSA)-toughened novolac type phenolic resin were investigated. Me- chanical properties of modified novolac-type phenolic resin increase with PDMSA contents, because the soft segment ofPDMSA absorbs the loads in the network of brittle novolac-type phenolic resins. TGA results show that the thermal degradation temper- atures are higher than 400°C, and the temperature of 10% weight loss increases with increasing the PDMSA content. The char yield increases with novolac-type phenolic resin content. The morphologies of the fracture surface of the modified novolac-type phenolic resin were investigated by scanning electron microscopy (SEM). Morphological results agree with those from mechanical properties of the modified novolac-type phenolic resin. The modified novolac-type phenolic resin also shows excellent flame retardance that is lTL-94, V-I, and the limited oxygen index is higher than 35.