ABSTRACT

More interest in larch (Larix kaempferi) has been taken because of a greater focus on environmental properties. Steam explosion is an inexpensive and facile approach for the increasing rate of drying and durability of wood. A significant improvement in gas permeability and sound absorption coefficient of steam-exploded larch wood relative to the control wood is observed. It is due to structural changes in the cell wall that is proved by Fourier transform infrared spectroscopy, field emission scanning electron microscope, X-ray diffraction, and Energy-dispersive X-ray spectroscopy. The average increase in SAC of steam-exploded samples is 33.33% higher than the control samples at a wide range of frequency 250-6400 Hz due to the increasing air permeability (190.1%). Color of treated larch wood changed to black due to several chemical reactions in the cell wall and reduced of –OH functionality during the steam explosion. These findings summarized that steam explosion affects softwood cellulose cell walls, and the cross-section surface of larch wood could be considered for improving acoustic comfort in the building.

摘要

对落叶松（Larix kaempferi) 之所以被采纳是因为更加关注环境属性。蒸汽爆破是提高木材干燥速度和耐久性的一种廉价且简便的方法。观察到与对照木材相比，蒸汽爆破落叶松木材的透气性和吸声系数有显着改善。傅里叶变换红外光谱、场发射扫描电子显微镜、X射线衍射和能量色散X射线光谱证明这是由于细胞壁的结构变化所致。由于透气性增加 (190.1%)，在 250-6400 Hz 的宽频率范围内，蒸汽爆破样品的 SAC 平均增加量比对照样品高 33.33%。经处理的落叶松木材的颜色变为黑色，原因是细胞壁发生了多种化学反应，并且在蒸汽爆炸过程中减少了 –OH 官能团。这些发现总结了蒸汽爆炸会影响软木纤维素细胞壁，而落叶松木材的横截面可以考虑用于改善建筑物的声学舒适度。