Mg. Kim et al., ADHESIVE PROPERTIES OF FURFURAL-MODIFIED PHENOL-FORMALDEHYDE RESINS AS ORIENTED STRANDBOARD BINDERS, Holzforschung, 48(3), 1994, pp. 262-267
Furfural-modified phenol-formaldehyde (PF) resol resins were synthesiz
ed by replacing the formaldehyde at a 12.5 mole% level with furfural.
The nonvolatile solids contents were set at 42%, 46% and 50% to reflec
t the molecular weight range of the comparable PF resol resins current
ly used in this application. Evaluations of these furfural-modified PF
resins as oriented strandboard (OSB) adhesive hinders indicated that
the furfural modification at this level is a technically feasible meth
od. The chemical structure of furfural-modified PF resins studied by f
ractionation and C-13 NMR has shown that furfural is incorporated with
in the phenolic polymer structure most likely as furanylmethine groups
while some furanylmethylol groups are also present in low molecular w
eight fractions.