Properties of wheat straw particleboards bonded with different types of resin

Abstract

Wheat straw particleboard bonded with a ureaformaldehyde (UF) resin, usually employed in the manufacture of wood-based particleboards, or with a resin based on epoxidised oil was manufactured using a compression molding machine. The effects of resin type on internal bond strength, flexural modulus, and thickness swelling were examined. The properties of boards using UF resins were poor. Internal bond strength and thickness swelling, linked to adhesion quality, were especially low. The high compatibility between straw particles and oil-based resin was explained in terms of straw surface free energy. In straw, this parameter exhibits a much lower polar component than wood species and leads to higher compatibility with resins based on oil than with water-soluble systems like UF.

Particleboard quality characteristics of saline jose tall wheatgrass and chemical treatment effect

“…Contact angles between adhesives and JTW (treated and untreated) were measured 3 to determine the compatibility between the adhesives and JTW particles, using a contact 4 angle goniometer (Model 100, Ramé-hart Instrument Co.), under standard conditions (50% 5 RH at 23°C) (Boquillon et al, 2004). Relatively large leaf sheathes of JTW flake were 6 flattened and cut into 1 cm×3 cm rectangular pieces.…”

“…The inner surface of JTW leaf sheath is more visibly glossy than outer surface, 8 which means the inner surface has more wax than outer surface. Therefore, the method 9 described by Boquillon et al (2004) was modified and applied in this study. The outer 10 surface was attached to 5 cm×5 cm square glass using epoxy resin.…”

Development of environmentally friendly composite matrices from epoxidized cottonseed oil

“…In contrast to terminal epoxides (typical of petroleum-based epoxies) that can be easily reacted with amines (even at room temperature) to give fully cured materials, the epoxy groups in epoxidized vegetable oils are not located in terminal positions so that, reaction with amines is difficult. [21] Reaction of non-terminal groups proceeds with carboxylic acids; so that, cyclic anhydrides derived from dicarboxylic acids have been proposed as attractive curing agents for EVOs. Maleic anhydride (MA) and phthalic anhydride (PA) have been used as hardeners for epoxy resins; nevertheless, as they have a melt point of 52.8 ºC and 131.6 ºC respectively, the formulation needs previous heating to homogenize mixture with the liquid resin.…”

Wood production, wood technology, and biotechnological impacts

“…Globally, many lignocellulosic material options exist for the production of composite products, both in industrialised as well as in developing countries. Tested in production of particle-and fibreboards were for example wheat straw , Mo et al 2003, Boquillon et al 2004, Schirp et al 2006a, paddy straw (Sampathrajan et al 1992, Hiziroglu et al 2007), reed , Habibi 2006, Miscanthus fibres (Velasquez et al 2002, Salvadó et al 2003, Agropyron straw (Zheng et al 2007), bamboo (Zhang et al 1996, Ma et al 1998, Bai et al 1999 The process of particle board production on pilot scale in the "Biotechnikum" at the Institute of Forest Botany in Göttingen (compare Fig. 19).…”