Rheological, wood penetration, and fracture performance studies of PF/pMDI hybrid resins

Simple physical blends of liquid resole phenol-formaldehyde (PF) and polymeric diphenylmethane diisocyanate (pMDI) were studied for their potential industrial use in wood-based composite manufacture. The neat adhesives were commercial OSB resins, selected to represent what might be the least expensive version of this hybrid system. Basic rheological properties (steady-state flow curves) were examined for the neat resins, and for the hybrids as a function of blend ratio and mixing rate. Wood penetration and fracture cleavage adhesion were examined solely as a function of blend ratio. While the expected PF and pMDI co-reaction was seen, the properties of the hybrids were dominated by simple emulsion effects. Emulsion effects in concert with typical neat resin variables make this a very complicated resin system. Therefore, any potential industrial use will require a significant amount of research and development to make this a viable technology.

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