Bonding of Lignocellulosic Surfaces by Oxidative Treatment and Monomeric or Simple Polymeric Crosslinking Agents

Activation of Wood Surface and Nonconventional Bonding

“…Acceptable particle board was obtained at relatively high densities (density, 0.74-0.78 g/cm 3 ; IB, 102-154 psi; swelling in 2-h boil test, 26-42%). Good results were also obtained by using furfuryl alcohol/formaldehyde cross-linking mixtures with maleic acid instead of HC1 (84,86). Both of these procedures involve acid polymerization of furfuryl alcohol and are discussed in the next section.…”

Exterior Particleboard Bonded with Oxidative Pretreatment and Crosslinking Agent

“…Diffusion of the aqueous reagent into the dried flakes having a MC in the ränge of 2-4%, after transferring to the blender, would be expected to be rapid. Since it has been observed that properties of the finished products are a function of pretreatment time (Brink et al 1977;Johns et al 1978), some of the reactions occurring must be relatively slow. Accordingly, the effective oxidant concentration, though an approximation, is thought to best represent the initial oxidant concentration.…”

“…Such a mechanism, hypothesized äs a basis for conducting experimental work, has been reviewed (Brink et al 1977). Numerous electrophilic reaction can take place between wood and various reactive species which are formed from nitric acid; e.g., nitrosyl ion (NO 2 ) and nitrosonium (NO) ion (Brink and Lin 1978).…”

“…A number of publications have set forth various aspects of this bonding System äs it has evolved (Brink 1975;Brink et al 1977;Collet 1974;Johns et al 1978;Pohlman 1974;Stofko and Zavarin 1977). They support the hypothesis that covalent type linkages can be formed which result in water-resistant, exterior-type bonding of wood particles.…”

Bonding Wood by Graft Polymerization. The Effect of Hydrogen Peroxide Concentration on the Bonding and Properties of Particleboard

“…Hydrogen peroxide and nitric acid developed better bonding and appearedtopossessvaluableproperties äs bonding agents for wood. The nitric acid System was studied further and reported by Brink et al (1977) andJohnsetal.(1978). The present work discusses the effect of hydrogen peroxide concentration on the bonding and properties of particleboard in relation to three Systems of polymerizingchemicals and three species of wood.…”