39360-54-8A typical commercial novolak epoxy resin has an average molecular weight of 650 and contains about 3.6 epoxy groups per molecule. Because of their multifunctionality, the novolak epoxy resins give, on curing, more tightly cross-linked products than the bisphenol A-based resins. This results in improved elevated temperature performance and chemical resistance.
Novolak resins are low molecular weight polymers consisting of phenolic nuclei linked in the 0- and p- positions by methylene groups. They may be epoxidized through the phenolic hydroxyl groups by treatment with epichlorhydrin:
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