High pressure DSC of phenolformaldehyde moulding compounds

  • Korošec R
  • Mežnar L
  • Bukovec P
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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 lowHMTA 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 in- creases. 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.

Author-supplied keywords

  • Composite material
  • Curing reaction
  • Hexamethylenetetramine
  • High pressure DSC (HP DSC)
  • Novolac
  • Phenolformaldehyde resin
  • Thermoset

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