Characterization of Chemical Properties and Flow Parameters of Powdered Phenol-Formaldehyde Resins


  • Simon C. Ellis
  • Paul R. Steiner


Phenol-formaldehyde, molecular weight, flow measurement


A range of powdered phenol-formaldehyde resins was studied to examine the relationships between chemical structures and cure and flow parameters. Nine commercially available powdered waferboard/oriented strandboard resins and six laboratory-synthesized resins were chemically characterized by gel permeation chromatography and proton magnetic resonance spectroscopy. The flow properties of the resins were determined using thermal mechanical analysis and other empirical techniques. Those resins containing greater proportions of low molecular weight species tended to exhibit greater total flow than higher molecular weight resins, with most of this flow occurring at lower temperatures. For similar molecular weight distributions, resins containing fewer methylol groups exhibited more flow. A liquid resin sample converted to a powder by spray-drying showed a higher degree of condensation than the same resin converted by freeze-drying. A resin sample that had been stored for over seven years exhibited a major shift to higher molecular weight values and greatly reduced flow compared to a fresh sample of the same resin.


Go, H. 1988. New developments in waferboard/OSB resin technology. Particleboard/Composite Materials Symposium, Washington State University, Pullman, WA, 123-132.nGollob, L. H. 1983. The interaction of formulation parameters with chemical structure and adhesive performance of phenol-formaldehyde resins. Ph.D. dissertation, Oregon State University, Corvallis, OR.nGupta, R. C., and V. K. Sehgal. 1979. Effect of viscosity and molecular weight of lignin-phenol-formaldehyde-resin on the glue adhesion strength of plywood. Holz- und Holzverwertung 31:7-9.nJones, T. T. 1952. The melt viscosity of some phenol formaldehyde novolak resins. J. Appl. Chem. 2:134-149.nKatovic, Z., and M. Stefanic. 1985. Intermolecular hydrogen bonding in novolaks. Ind. Eng. Chem., Prod. Res. Div. 24:1117-1130.nMartin, R. W. 1956. The chemistry of phenolic resins. John Wiley and Sons Inc., New York.nMegson, N. J. L. 1958. Phenolic resin chemistry. Butterworths Scientific Publications, London.nSteiner, P. R. 1975. Phenol-formaldehyde wood adhesive characterization by proton magnetic resonance spectroscopy. J. Appl. Polym. Sci. 19:215-225.nWoodbrey, J. C., H. P. Higgenbottom, and H. M. Culbertson. 1965. Proton magnetic resonance study on the structures of phenol-formaldehyde resins. J. Polym. Sci. A 3:1079-1106.n






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