caa a22 4500 463216571 CHVBK 20180405153158.0 cr unu---uuuuu 170326e20070801xx s 000 0 eng 10.1007/s00226-007-0137-6 doi (NATIONALLICENCE)springer-10.1007/s00226-007-0137-6 Dielectric properties of silicon dioxide/wood composite [Elektronische Daten] [Yunlin Fu, Guangjie Zhao] For a better understanding of the binding between silicon dioxide and wood as well as the dielectric properties of silicon dioxide/wood composite, dielectric relaxation was measured for untreated wood [Cunninghamia lanceolata (Lamb.) Hook] and for silicon dioxide/wood composite with different weight percentage gain (WPG). Cole-Cole's circular arc law, distribution spectrum of relaxation time and relation model were applied to the results of relaxation due to motions of the methylol groups. The results were as follows. The generalized relaxation time and ε s −ε ∞ decreased with increasing WPG. The distribution spectrum of relaxation time decreased more and more and broadened with increasing WPG. The methylol group in the amorphous region of the wood cell wall participated in hydrolysis reaction and condensation reaction caused by tetraethylorthosilicate (TEOS), and there is a cross-link between silicon dioxide and wood. The value of apparent activation energy (ΔE) increased for silicon dioxide/wood composite, and increased with increasing WPG. Activation enthalpy (ΔH) and activation entropy (ΔS) increased, while activation free energy (ΔG) decreased with increasing WPG. The number of hydroxyl groups cut in dielectric relaxation increased with increasing WPG. Springer-Verlag, 2007 Fu Yunlin Forestry College, Guangxi University, 530004, Nanning, People's Republic of China aut Zhao Guangjie School of Material Science and Technology, Beijing Forestry University, 100083, Beijing, People's Republic of China aut Wood Science and Technology Springer-Verlag 41/6(2007-08-01), 511-522 0043-7719 41:6<511 2007 41 226 https://doi.org/10.1007/s00226-007-0137-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00226-007-0137-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fu Yunlin Forestry College, Guangxi University, 530004, Nanning, People's Republic of China aut NATIONALLICENCE 700 1- Zhao Guangjie School of Material Science and Technology, Beijing Forestry University, 100083, Beijing, People's Republic of China aut NATIONALLICENCE 773 0- Wood Science and Technology Springer-Verlag 41/6(2007-08-01), 511-522 0043-7719 41:6<511 2007 41 226 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer