Synergistic Modification of Eucalyptus Urophylla Wood by Chitosan-SiO2 Biomimetic Mineralization
CHEN Shiyao1, YUAN Guangming1,2, YANG Tao1, XIA Mingchu1, MU Mingming1
1 College of Material Science and Engineering, Central South University of Forestry & Technology, Changsha 410004, China 2 Collaborative Innovation Center for Effective Utilizing of Wood & Bamboo Resource, Changsha 410004, China
Abstract: The biomimetic mineralization of Eucalyptus urophylla wood was modified by self-assembly of chitosan and SiO2. Chitosan was grafted onto the cell wall of Eucalyptus wood, and polyhydroxyl SiO2 was grafted alternately to improve the wood properties of Eucalyptus. The mechanical properties such as compression strength parallel to grain, impact toughness, abrasion resistance, hardness and thermal stability of modified Eucalyptus were tested. SEM, FTIR and XRD were used to study the microstructure and structure of materials. The results showed that compression strength parallel to grain, impact toughness, wear resistance and end face hardness properties were 85.91 MPa, 82.5 kJ/m2, 18.30 mg/100r, 6 450 N, and increased by 54.8%,94.1%,24.8% and 110% respectively. Thermal stability carbon residue reached 48.21%, which increased 173% compared with blank Eucalyptus. Chitosan and SiO2 co-modified Eucalyptus can form organic-inorganic hybrid structure to enhance the properties of wood. SEM showed that there was a three-dimensional network of organic and inorganic hybrid structures covering the pores and ducts inside the wood, and some SiO2 particles were distributed between the wood fiber cell walls in the wood duct wall as spherical particles. XRD showed that SiO2 particles enter into wood in amorphous state, compared with blank Eucalyptus, the diffraction peak strength and crystallinity of the modified material decreased slightly. After the formation of stable -CONH bond between chitosan and wood, Si-O-C bond was formed by electrostatic adsorption of SiO2 particles.
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2020, Vol. 34 
