This study investigated variations in the chemical compositions and thermal decomposition kinetics of Japanese cedar and beech wood during heat treatment. Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectra revealed that various reactions, such as hemicellulose deacetylation, condensation reactions causing lignin cross-linking, and reductions in cellulose amorphous regions, were carried out during the heat treatment process. In addition, combinations of FTIR spectra and principal component analysis (PCA) succeeded in discriminating the major changes in functional groups of wood at various heat treatment temperatures. On the other hand, the decrease in the storage modulus of wood was more rapid in the presence of oxygen than in an oxygen-free atmosphere during heat treatment. Accordingly, the activation energies of thermal decomposition using Arrhenius model for Japanese cedar and beech were 120.6 and 141.3 kJ/mol under air, respectively, while these values were 124.8 and 150.0 kJ/mol under nitrogen, respectively.

这项研究调查了日本雪松和山毛榉木材在热处理过程中化学成分和热分解动力学的变化。傅立叶变换红外（FTIR）和核磁共振（NMR）光谱表明，在热处理过程中进行了各种反应，例如半纤维素脱乙酰化，引起木质素交联的缩合反应以及纤维素非晶区的减少。此外，FTIR光谱和主成分分析（PCA）的组合成功地辨别了在各种热处理温度下木材官能团的主要变化。另一方面，在有氧存在下，木材的储能模量的降低比在热处理过程中无氧气氛中的木材的储能模量的降低更为迅速。因此，