Highly thermal stable novolac type hardener modification and application in epoxy laminate composites

In this report we present the synthesis of two kinds of epoxy-curable diazo-coupling phenol novolac derivatives which gives rise to high crosslinking densities with reduced free volumes and tie-up the molecular segments and insert bulky substituent such as aromatic groups by inflammable N element. The synthetic procedure and material characteristics are discussed, and the flame retardancy and thermostability are evaluated and compared against the inorganic filler analogues.