Structure−Surface Property Relationships of Kraft Papers: Implication on Impregnation with Phenol−Formaldehyde Resin

Abstract

The structural features of four different kraft papers were related to their surface properties and to the response upon industrial impregnation with phenol−formaldehyde (PF) resin. The chemical composition and the structure of paper were suggested to be important factors determining the interaction with PF resin, which was assessed by contact angle measurements and surface energy analysis. The presence of fatty matter (extractives) and inorganic fillers together with structural anisotropy of paper confers the difference in affinity of the face and backside of papers toward PF resin. This affects the resin distribution in impregnated precured kraft papers as revealed by microfluorescence spectroscopic analysis of transversal cuts.