What does PFR stand for?

Charles Xu says the project looks at producing phenol-formaldehyde resin from forestry biomass and agricultural residue such as sawdust, wood chips, bark, pulp and paper residue, wheat straw and corn stalks.

A major route for human exposure is inhalation of formaldehyde gas emitted from urea- and phenol-formaldehyde resins used as adhesives in engineered woods such as plywood and particleboard.

Since the resol type phenol-formaldehyde resin used in this study was procured from a commercial source, the actual phenol/formaldehyde ratio is not known.

There has been a continual shift in technology from the early days of oil-modified phenol-formaldehyde resins, to alkyds, chlorinated rubber and solvent-based materials to today's more environmentally advanced and higher performing waterborne acrylic traffic paints.

The coatings are comprised of an ammonium salt of an epoxy resin, prepared by reacting phenol compound and epichlorohydrin, converting the product from into a cationic NH2 containing form by reaction with an amine, an amine adduct or ammonia, and converting the product into the corresponding the ammonium salt of the epoxy resin by adding an organic acid, a phenol-formaldehyde resin, a polyketone resin having a number average molecular weight Mn of at least 500, and a mixture comprising water and organic solvent.

The solventless resol type Phenol-formaldehyde resin (under the trade name of PR-100) was produced by ABR Organics Ltd.

D4613-86 (1996): Standard test method for measuring apparent pH of water insoluble phenol-formaldehyde resins.

13C NMR has been the most powerful analytical tool used to characterize phenol-formaldehyde resins and to a much lesser extent resorcinol-formaldehyde resins (2).