ABSTRACT

This paper presents mechanical properties and biological durability properties against soft-rot (soil bed test) and subterranean termites (grave-yard test) of the wood modified with a vinylic derivative of glycerol or polyglycerol and maleic anhydride at different curing conditions. Wood modification was performed through impregnation of European beech (Fagus sylvatica) with an aqueous solution of polyglycerol maleate, glycerol maleate, or maleic anhydride at 10 or 20% w/w concentration, followed with curing under oven heating (OHT) in an open system (120°C, 150°C, or 220°C) or under heat pressurised steam (HPS) at 150°C in a closed system. Results revealed that almost all modified wood presented higher modulus of elasticity (MOE) values than untreated wood, however, modulus of rupture (MOR) and work to maximum load in bending (WMLB) decreased considerably. Biological durability in the soil bed test against soft-rot indicated that almost all modified wood was specified as “durable” to “very durable”. However, among the treatments, the wood modified with polyglycerol maleate/glycerol maleate/maleic anhydride at 20% under OHT 150°C or the wood modified at lower additive concentration (10%) under OHT 220°C presented excellent durability against subterranean termites within a period of 328 days in the field.

摘要

本文介绍了在不同固化条件下，用甘油的乙烯衍生物或聚甘油和马来酸酐改性的木材对软腐（土床试验）和地下白蚁（墓地试验）的机械性能和生物耐久性能。木材改性是通过浸渍欧洲山毛榉（Fagus sylvatica) 使用浓度为 10 或 20% w/w 的聚甘油马来酸酯、马来酸甘油酯或马来酸酐的水溶液，然后在开放系统（120°C、150°C 或 220°）中在烘箱加热 (OHT) 下固化C) 或在封闭系统中 150°C 的热加压蒸汽 (HPS) 下。结果表明，几乎所有改性木材的弹性模量 (MOE) 值都高于未经处理的木材，但断裂模量 (MOR) 和最大弯曲载荷 (WMLB) 显着下降。土壤软腐试验中的生物耐久性表明，几乎所有改性木材都被指定为“耐用”到“非常耐用”。然而，在治疗中，