H2O2 Solution Steaming Combined Method to Cellulose Skeleton for Transparent Wood Infiltrated with Cellulose Acetate

Jun Zhang; Yongling Ying; Xiaoyang Yi; Wenbo Han; Lu Yin; Yongjun Zheng; Rongbo Zheng

doi:10.3390/polym15071733

H₂O₂ Solution Steaming Combined Method to Cellulose Skeleton for Transparent Wood Infiltrated with Cellulose Acetate

Polymers (Basel). 2023 Mar 31;15(7):1733. doi: 10.3390/polym15071733.

Authors

Jun Zhang¹, Yongling Ying¹, Xiaoyang Yi¹, Wenbo Han¹, Lu Yin¹, Yongjun Zheng², Rongbo Zheng¹

Affiliations

¹ School of Materials and Chemical Engineering, Southwest Forestry University, Kunming 650224, China.
² School of Marine Science and Technology, Shanwei Institute of Technology, Shanwei 516600, China.

Abstract

Hydrogen peroxide (H₂O₂) steaming, a green and highly efficient delignification method, has been demonstrated to provide a wood skeleton with a very low content of residual lignin in the manufacturing of transparent wood. It usually requires a long reaction time and a large amount of H₂O₂ because the piece of wood is treated using steaming equipment. Herein, a H₂O₂ solution steaming method was developed for the highly efficient removal of lignin from wood. Specifically, several wood samples were simultaneously immersed in a hot H₂O₂ solution to obtain delignified wood with a relatively high content of residual lignin, which provided a high strength and preserved the cellulose skeleton. Subsequently, the delignified wood with a relatively high content of residual lignin was further treated with H₂O₂ steam to obtain a very low lignin delignified wood. Compared with the previous H₂O₂ steaming method, the reaction time and used H₂O₂ volume of the H₂O₂ solution steaming method was reduced by 37.3% and 52.7%, respectively. All-biomass transparent wood could be obtained by infiltrating the delignified wood with cellulose acetate, which showed both a high transmittance of 83.0% and a low thermal conductivity of 0.30 Wm^-1K^-1.

Keywords: H2O2 solution steaming delignification; cellulose acetate; transparent wood.

Grants and funding

The current investigations were financially supported by the Yunnan Fundamental Research (202001AS070041) and the Educational Commission of Guangdong Province of China (2021ZDZX2073).