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首页> 外文期刊>Journal of Applied Polymer Science >Wood bonding by mechanically-induced in situ welding of polymeric structural wood constituents
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Wood bonding by mechanically-induced in situ welding of polymeric structural wood constituents

机译：通过机械诱导原位焊接聚合物结构木材成分进行木材粘合

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Mechanically induced wood fusion welding, without any adhesive, is shown here to yield rapidly bonding wood joints satisfying the relevant requirements for structural application. The mechanism of mechanically induced vibrational wood fusion welding is shown to be due mostly to the melting and flowing of amorphous cells-interconnecting polymer material in the structure of wood, mainly lignin, but also some hemicelluloses. This causes a partial detachment, the "ungluing," of long hood cells and wood fibers and the formation of an entanglement network drowned in a matrix of melted material which then solidifies, thus forming a wood cell/fiber entanglement network composite with a molten lignin polymer matrix. During the welding period some of the detached wood fibers which are no longer being held by the interconnecting material are pushed out of the joint as excess fiber. Crosslinking chemical reactions of lignin and carbohydrate-derived furfural also occur. Their presence has been identified by CP-MAS C-13-NMR. These reactions, however, are relatively minor contributors during the very short welding period. Their contribution increases after welding has finished, which explains why relatively longer holding times under pressure after the end of welding contribute strongly to obtaining a good bond. (C) 2004 Wiley Periodicals, Inc. [References: 13]
机译：此处显示了机械诱导的木材熔焊，没有任何粘合剂，可产生快速粘合的木材接头，满足结构应用的相关要求。机械诱导振动的木材熔融焊接的机理主要是由于在木质结构中无定形细胞互连聚合物材料（主要是木质素）和一些半纤维素的熔化和流动所致。这会导致部分脱落，长罩状细胞和木质纤维“脱胶”，并形成缠结网络，淹没在熔融材料的基质中，然后固化，从而形成具有熔融木质素的木质细胞/纤维缠结网络复合材料聚合物基质。在焊接期间，一些不再被互连材料固定的脱落的木纤维作为多余的纤维被从接头中推出。木质素和碳水化合物衍生的糠醛的交联化学反应也会发生。它们的存在已通过CP-MAS C-13-NMR鉴定。但是，在非常短的焊接期间，这些反应的贡献相对较小。焊接结束后，它们的作用增加，这解释了为什么焊接结束后在压力下保持相对较长的时间会大大有助于获得良好的粘结性。 （C）2004 Wiley Periodicals，Inc. [参考：13]

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