Temperature-dependent mechanical properties of wood-adhesive bondline evaluated by nanoindentation

被引:21
|
作者
Wang, Xinzhou [1 ,2 ]
Li, Yanjun [1 ]
Wang, Siqun [2 ]
Yu, Wangwang [1 ,3 ]
Deng, Yuhe [1 ]
机构
[1] Nanjing Forestry Univ, Coll Mat Sci & Engn, Nanjing 210037, Jiangsu, Peoples R China
[2] Univ Tennessee, Ctr Renewable Carbon, Knoxville, TN 37996 USA
[3] Nanjing Inst Ind Technol, Sch Mech Engn, Nanjing, Jiangsu, Peoples R China
来源
JOURNAL OF ADHESION | 2017年 / 93卷 / 08期
关键词
Adhesive for wood; interphases; mechanical properties; nanoindentation; temperature; wood; PHENOL-FORMALDEHYDE RESIN; THERMALLY MODIFIED WOOD; STEP HEAT PRETREATMENT; CELL-WALLS; CHEMICAL-CHANGES; ELASTIC-MODULUS; TREATED WOOD; PART; COMPOSITES; INTERPHASE;
D O I
10.1080/00218464.2015.1130629
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Phenol formaldehyde (PF) and urea formaldehyde (UF) were used to prepare wood-adhesive bonds, respectively. The reduced elastic modulus (E-r) and hardness (H) of the control wood cell wall, the adhesive, and the cell wall penetrated with an adhesive (CW-adhesive) at the wood-adhesive bondline were measured within a certain temperature range from 20 to 160 degrees C using high-temperature nanoindentation (NI). The results indicated that the wood-PF bondline showed a strong dependence on elevated temperatures, while the wood-UF bondline presented better mechanical stability. A reduction of carbohydrates and increment of lignin in wood resulting from heat treatment at a temperature above 140 degrees C were beneficial to increase the micromechanics of wood cell walls at the bondline. Furthermore, the possible post cross-linking reactions between the wood cell walls and PF adhesive molecules during the long heating period at high temperature made a major contribution to a significant increase in E-r and H of the bondline. However, the significant difference in the mechanics of the PF adhesive and CW-PF in bondline after heat treatment negatively affects the interfacial adhesion properties of wood panels.
引用
收藏
页码:640 / 656
页数:17
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