Interfacial Properties of Loblolly Pine Bonded with Epoxy/Wood Pyrolysis Bio-oil Blended System
Interfacial Properties of Loblolly Pine Bonded with Epoxy/Wood Pyrolysis Bio-oil Blended System
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DOI：
10.15376/biores.10.1.638-646
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发表时间：
2014-12
期刊：
影响因子：
1.5
通讯作者：
Yi Liu;Jianmin Gao;H. Guo;Yuanfeng Pan;Chengfeng Zhou;Qingzheng Cheng;B. Via
中科院分区：
文献类型：
--
作者：
Yi Liu;Jianmin Gao;H. Guo;Yuanfeng Pan;Chengfeng Zhou;Qingzheng Cheng;B. Via
研究了环氧树脂/木材热解生物油树脂固化火炬松单板的粘结界面。通过计算黏附链的抗剪强度，考察生物油的加入对环氧树脂性能的影响。研究了木材基材的化学结构、固化行为和微观结构，分析了木材基材与树脂的相互作用。结果表明，随着生物油添加量的增加，松木树脂接头的强度逐渐降低。然而，当替代率低于30%时，这种效果不明显。ATR-FTIR分析证实，木材组分与环氧树脂/生物油树脂之间发生了复杂的化学反应，参与了界面交联。-OH和C-O-C官能团的反应程度对木材键合线的键合应力起关键调节作用。生物油的加入加速了缩聚交联过程，降低了固化温度。扫描电镜和光学显微镜观察发现，环氧树脂/生物油树脂在孔和管胞间隙形成凝胶钉，导致木材细胞壁毛细血管闭合，胶体界面延伸至木材微毛细血管系统。
The bonding interface of loblolly pine veneers cured with epoxy/wood pyrolysis bio-oil resins was studied. The shear strength of the adhered strands was calculated to examine the effect of bio-oil addition on epoxy resin performance. The chemical structure, curing behavior, and microstructure were investigated to analyze the interaction between wood substrate and resins. Results showed that the strength of pine wood-resin joints gradually decreased as more bio-oil was added. However, this effect was not apparent when the substitution rate was lower than 30%. ATR-FTIR analysis confirmed that complex chemical reactions take place between wood constituents and epoxy/bio-oil resins involved in the cross-linking at the interface. The reaction degree of -OH and C-O-C functional groups plays a key role in regulating the bonding stress of the wood bond line. The addition of bio-oil accelerated the polycondensation cross-linking process, resulting in a decreased cure temperature. SEM and optical microscopy showed that the epoxy/bio-oil resin formed gel nails in the pit and tracheid gaps, leading to the closing of the capillaries of the wood’s cell walls and the colloidal interface extending into the timber micro-capillary system.