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，用甘油或聚甘油和马来酸酐的乙烯基衍生物改性的木材的软腐性（土壤床试验）和地下白蚁（重力试验）的机械性能和生物耐久性能。通过欧洲山毛榉（Fagus sylvatica）的浸渍进行木材改性）的浓度为10或20％w / w的聚马来酸甘油酯，马来酸甘油酯或马来酸酐水溶液，然后在开放式系统（120°C，150°C或220°C）中在烤箱加热（OHT）下固化C）或在密闭系统中在150°C的热压蒸汽（HPS）下进行。结果显示，几乎所有改性木料都比未处理木料具有更高的弹性模量（MOE），但是，断裂模量（MOR）和最大弯曲载荷功（WMLB）大大降低。在土壤床上对软腐病的生物耐用性测试表明，几乎所有改性木材都被指定为“耐用”到“非常耐用”。但是，在治疗方法中