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

• Published in: Forest products journal Vol. 54; no. 10; pp. 74 - 81
• Main Authors: Zheng, J, Fox, S.C, Frazier, C.E
• Format: Journal Article
• Language: English
• Published: Madison, WI Forest Products Society 01.10.2004
• Subjects: adhesive penetration; Adhesives; Aldehydes; Applied sciences; composite wood products; Emulsion polymerization; emulsions; Exact sciences and technology; Forest products industry; fracture cleavage; Laminates; liquid phenol-formaldehyde resole; Liriodendron tulipifera; mixtures; Moisture content; NMR; Nuclear magnetic resonance; oriented strandboards; Phenols; Pinus; Polymer industry, paints, wood; polymeric diphenylmethane diisocyanate; Resins; rheological properties; Rheology; southern yellow pine; Statistical analysis; Studies; Viscosity; wood bonding; Wood composites; Wood products; wood technology; Wood-based materials; Wood. Paper. Non wovens; United States > US; Viscosity; Liriodendron tulipifera; Steady flow; Softwood; Fracture; Pinus; Formaldehyde; Composite material; Dicotyledones; Magnoliaceae; Angiospermae; Gymnospermae; Surface properties; Cleavage; Resins; Adhesive; Isocyanates; Oriented strandboard; Hardwood; Experimental study; Adhesion; Resol; Phenol; Penetration; Coniferales; Spermatophyta; Performance; Rheological properties
• ISSN: 0015-7473; 2376-9637

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. [PUBLICATION ABSTRACT]