Preparation and characterization of demethylated lignin-polyethylenimine adhesives

被引：56

作者：

Liu, Y. ^{[1
]}

Li, K. ^{[1
]}

机构：

[1] Oregon State Univ, Dept Wood Sci & Engn, Corvallis, OR 97331 USA

来源：

JOURNAL OF ADHESION | 2006年 / 82卷 / 06期

关键词：

adhesives; demethylation; kraft lignin; marine adhesive; mussel protein; polyethylenimine; wood composites;

D O I：

10.1080/00218460600766632

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Petrochemical-based adhesives such as urea-formaldehyde and phenol-formaldehyde resins are predominant wood adhesives. In this study, a new wood adhesive from lignin was developed and characterized. The new adhesive consisted of demethylated kraft lignin (DKL), a byproduct in the production of dimethyl sulfoxide from kraft lignin, and a polyethylenimine (PEI). Lap-shear specimens bonded with this new DKL-PEI adhesive system had very high shear strength and were very water-resistant. The effects of the preparation time, the curing conditions, the total solids content of the adhesive, the DKL/PEI weight ratio and the molecular weight of PEI on the shear strength and water-resistance of the resulting lap-shear specimens were studied in detail. Investigation on the curing chemistry of this new adhesive revealed that phenolic hydroxyl groups were oxidized to form quinones that further reacted with PEI. It was proposed that the curing mechanisms of this DKL-PEI adhesive were similar to the quinone-tanning processes in nature.

引用

页码：593 / 605

页数：13

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