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Summary Dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC) were applied to samples of phenol-formoldehyde resole resins that had been previously exposed to dry precure conditions. The area under tan delta curves during DMA isothermal scans of such samples decreased as the degree of precure increased; this area was used as an empirical measure of the rate of mechanical cure for phenolic resins. Similarly, the DSC exotherm area decreased with greater sample precure; this area was used to measure the rate of chemical cure. Rates of mechanical and chemical cure differed for different resins and with temperature. Under dry precure conditions at 115° and 140°C, a high degree of mechanical cure was achieved at a low degree of chemical cure.

holzforschung

Phenol-Formaldehyde Resin Curing and Bonding in Steam-Injection Pressing. Part II. Differences Between Rates of Chemical and Mechanical Responses to Resin Cure