文献类型：期刊文献

英文题名：Effect of high-intensity microwave (HIMW) treatment on chemistry of radiata pine

作者：Xing, Xuefeng[1,2,3] Li, Shanming[2,3] Jin, Juwan[1,3] Lin, Lanying[2] Zhou, Yongdong[2] Peng, Limin[2] Fu, Feng[2]

第一作者：Xing, Xuefeng

通信作者：Jin, JW[1];Li, SM[2];Li, SM[3];Jin, JW[3]

机构：[1]Nanjing Forestry Univ, Coll Mat Sci & Engn, Nanjing, Peoples R China;[2]Chinese Acad Forestry, Res Inst Wood Ind, Beijing, Peoples R China;[3]Nanjing Forestry Univ, Coinnovat Ctr Efficient Proc & Utilizat Forest Res, Nanjing, Peoples R China

年份：2023

外文期刊名：WOOD SCIENCE AND TECHNOLOGY

收录：;EI(收录号：20233314563426);Scopus(收录号：2-s2.0-85167813756);WOS:【SCI-EXPANDED(收录号:WOS:001046599700002)】；

基金：AcknowledgementsThe authors gratefully thank the funding supports from the National Key Research & Development Program of China (No. 2022YFD2200703) and the funding supports from the National Natural Science Foundation of China Youth Project (No. 31700641). The authors also thank Yongle Zhang at the Research Institute of Wood Industry (CRIWI) for assistance in microwave treatment. The authors gratefully acknowledge the linguistic assistance provided by Prof. Liping Cai from University of North Texas. The authors would like to thank all the reviewers who participated in the review.

语种：英文

外文关键词：Crystallinity - Fourier transform infrared spectroscopy - Lignin - Wood products - X ray photoelectron spectroscopy

摘要：This study investigated the effect of high-intensity microwave (HIMW) treatment on the chemistry of sapwood and heartwood of radiata pine. The wet chemical method, X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FTIR) spectroscopy, and X-ray diffraction (XRD) were utilized to assess and evaluate the effect of different microwave energy densities (0, 60, 80, and 100 kWh/m(3)) on the chemical composition, chemical structure, and cellulose crystallinity of both sapwood and heartwood. The results indicated that the greatest changes in the relative content of lignin and cellulose were observed at a microwave energy density of 80 kWh/m(3). Furthermore, XPS analysis demonstrated a decrease in the O/C ratio as the microwave energy density increased. When the energy density of microwave reached 100 kWh/m(3), the O/C ratio of sapwood and heartwood decreased by 10.2% and 19.6%, respectively. At the same time, no notable changes were detected in the FTIR spectra of the microwave-treated samples. Due to the recrystallization of cellulose and the presence of aromatic C=O groups, which could be linked to the rise in lignin content, there were slight variations in several absorption intensities and peak positions, such as O-H groups. As microwave energy density increased, both the crystallinity index (CI) and cellulose crystal width (D-200) of HIMW-treated samples increased accordingly. The findings indicated that the chemistry of radiate pine's sapwood and heartwood was affected differently by the microwave treatment. Notably, the heartwood exhibited a more pronounced impact compared to the sapwood.