Abstract

Samples of pine wood ozonated with different contents of water are studied via UV diffuse reflectance spectroscopy. It is shown that polyaromatic and stilbene structures, guaiacyl derivatives, and carbonyl- and carboxyl-containing aromatic structures of lignin are destroyed during ozonation of pine wood. The destruction of aromatic structures proceeds efficiently in wood with a moisture content of more than 60–65% in the 2–3 mmol/g range of ozone consumption. When the moisture content is below 40%, ozone treatment of pine wood at low ozone consumption allows us to obtain different modifications of oxygen-containing aromatic and polyaromatic structures on surfaces of lignocellulosic material (LCM). IR absorption spectra of dioxane lignin obtained from the initial and ozonated wood samples confirm the different direction of lignin transformations, depending on the content of moisture in the wood.

中文翻译：

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臭氧作用下木质素破坏木材的特征

摘要

通过紫外漫反射光谱研究了用不同水含量臭氧化的松木样品。结果表明，在松木臭氧化过程中，木质素的多芳族和二苯乙烯结构，愈创木脂酰衍生物，木质素的含羰基和羧基的芳族结构被破坏。在2–3 mmol / g臭氧消耗量范围内，水分含量超过60–65％的木材中，芳香结构的破坏得以有效进行。当水分含量低于40％时，以低臭氧消耗量对松木进行臭氧处理可以使我们在木质纤维素材料（LCM）的表面上获得含氧芳族和多芳族结构的不同修饰。从原始和臭氧化木材样品中获得的二恶烷木质素的红外吸收光谱证实了木质素转化的不同方向，