原位聚合制备木材/羟甲基脲复合材料及其表征  

Preparation and Characterization of Wood/Methylolurea Composite with In-Situ Polymerization

作　　者：武国峰[1] 郎倩[1] 陈鹤予[1] 姜亦飞[1] 蒲俊文[1] 

机构地区：[1]北京林业大学材料科学与技术学院,北京100083

出　　处：《光谱学与光谱分析》2011年第11期3078-3082,共5页Spectroscopy and Spectral Analysis

基　　金：国家"十一五"科技支撑项目(2006BAD32B03);北京市优秀博士学位论文指导教师科技项目(YB20091002201);北京林业大学科技创新计划项目(BLYJ201106)资助

摘　　要：以杨木生材为原料,采用原位聚合方法制备木材/羟甲基脲复合材料。羟甲基脲在脉冲式压力的作用下浸渍到木材内,在热压干燥过程中,经过原位聚合制备木基复合材料。根据国标对改性前后的木材化学成分进行了分析,并利用X射线光电子能谱(XPS)、核磁共振分析(13 C-NMR)、EDXA对改性前后木材中碳和氮元素含量、分布以及官能团变化进行了表征。结果表明木材化学处理后热水抽提物、苯醇抽提物含量提高了187.43%和230.87%,木素和综纤维素含量降低了26.55%和26.39%,XPS分析表明改性材O与C原子的浓度比增加了9.4%,N元素含量增加了137.2%,13 C-NMR分析表明羟甲基脲与木材结构中的羟基发生了化学反应,减少了羟基的含量,醚键含量增加,EDXA图谱说明了该处理方法可以得到浸渍均匀的改性材,而且氮元素均匀的分布在木材细胞壁及细胞间隙中。Wood/methylolurea composite was prepared with the in-situ polymerization.The green timber with high moisture content was impregnated by a pulse-dipping machine and then was dried in a hot-press drying kiln.The cross-linking reaction was taken under the heat treatment between the wood modifier and the wood composition,including cellulose,hemicelluloses,and lignin.The chemical composition was analyzed according to the Chinese standard,including X-ray photoelectron spectroscopy（XPS）,nuclear magnetic resonance（NMR） and energy dispersive analysis of X-rays（EDXA）.The changes in chemical composition of modified wood and carbon and nitrogen element were disused in the research.The results showed that the content of water extraction and benzene alcohol extraction increased 187.43% and 230.87% respectively compared with the natural wood,while the lignin and holocellulose decreased 26.55% and 26.39% respectively.XPS showed that the concentrations of O and C atoms increased 9.4% and N element content increased 137.2%.13C-NMR analysis showed that chemical reaction of the hydroxyl methyl urea with the hydroxyl in timber structure took place,with the reduction of hydroxyl content and increase in ether bond content.EDXA showed that the processing method can get impregnated modification wood and nitrogen element is evenly distributed in wood cell walls and intercellular space.

关 键 词：速生杨 羟甲基脲 原位聚合 性能表征 

分 类 号：TQ35[化学工程]