三聚氰胺-甲醛与木材的交联作用

CROSS-LINKING EFFECT BETWEEN WOOD AND MELAMINE-FORMALDEHYDE

为了研究木材压密化处理过程中交联试剂与木材的作用机理，以大青杨木材为试样，分离制得综纤维素、纤维素、α－纤维素、木质素和半纤维素，并分别与三聚氰胺－甲醛反应，测定了不同化学组分与交联剂作用的活性顺序及其分布。结果表明：三聚氰胺－甲醛与大青杨木材细胞壁组分的反应活性顺序为：木质素＞半纤维素＞综纤维素＞α－纤维素＞纤维素。还采用红外光谱（ＩＲ）对交联作用前后的综纤维素、纤维素和木质素的化学结构变化进行了分析，从而定性确定了交联化处理木材的主要官能团变化。

To study the mechanism of reaction between wood and crosslinking agent in com- pressed wood, lignin, holocellulose, cellulose, α-cellulose and hemicellulose were isolated from populus ussuriensis and reacted with melamine-formaldehyde.The distribution and reactivity of reacted chemicals in wood cell wall components were determined. The order of reactivity was found to be lignin>hemicellulose>holocellulose>α-cellulose>cellulose.The chemical construction of holocellulose,cellulose and lignin before and after crosslinking reaction were analysed.Using infrared(IR) spectra,thus the changes of main chemical groups of modificated wood were qualitatively determined.