The influence of pressure on the polycondensation reaction between novolac resin (N) present in commercially available moulding
compounds and hexamethylenetetramine (HMTA) was studied up to 80 bars under air and in an inert atmosphere. For a low HMTA
content (N/HMTA=98/2 mass ratio) high pressure enables the detection of two successive curing reactions. With increasing HMTA
content the peak due to the first curing reaction becomes less pronounced at high pressure, while the enthalpy of the second
increases. In an inert atmosphere both curing reactions are well observable even at ambient pressure and for lower HMTA content
take place at lower temperatures, as expected. For the sample with N/HMTA=98/2 the curing reaction was followed using TG-MS.