Noun
novolac (plural novolacs)
(materials science) Any of several polymers derived from phenols and formaldehyde with low molecular weight and related to Bakelite but less highly cross-linked.
DNQ-Novolac photoresist One very common positive photoresist used with the I, G and H-lines from a mercury-vapor lamp is based on a mixture of diazonaphthoquinone (DNQ) and novolac resin (a phenol formaldehyde resin ). Source: Internet
"Avcoat 5026-39/HC-G is an epoxy novolac resin with special additives in a fiberglass honeycomb matrix. Source: Internet
The mechanism by which unexposed DNQ inhibits novolac dissolution is not well understood, but is believed to be related to hydrogen bonding (or more exactly diazocoupling in the unexposed region). Source: Internet