聚乙二醇交联水性超支化聚丙烯酸酯分散有机蒙脱土浸渍处理木材的性能

Properties ofWood Impregnated withWaterborne Hyperbranched Polyacrylate Dispersed Organo-Montmorillonite Crosslinked by Polyethene Glycol

采用低分子量聚乙二醇200(PEG-200)与实验室合成的水性超支化聚丙烯酸酯(HBPA)分散有机蒙脱土(OMMT)乳液作为木材浸渍处理改性剂,对青杨(Populus cathayana Rehd.)边材进行浸渍处理,并对改性剂及其改性处理材进行化学结构分析以及形貌表征,分析改性剂对处理材的作用机理以及改性剂在处理材内的形态,并测试处理材的物理力学性能指标。结果表明:PEG-200与HBPA具有较好的相容性,OMMT在其中呈部分剥离状态;经过浸渍处理,部分HBPA和OMMT能够进入到木材细胞壁内,PEG能在HBPA和木材之间形成交联作用,但OMMT质量分数在4%时,部分OMMT填充在木材细胞腔内。改性剂处理材的物理力学性能提升,但OMMT质量分数4%相对2%的提升幅度不大。

A laboratory-synthesized waterborne hyperbranched polyacrylate(HBPA)dispersed organomontmorillonite(OMMT)emulsion with low molecular polyethene glycol 200(PEG-200)was used as wood impregnating modifier to treat the sapwood of Cathy poplar(Populus cathayana Rehd.).The chemical structure and composition of the compound modifiers and the properties of modified wood were characterized.The water absorption,the volume swelling,the compression strength,and the flexural strength of the modified wood were tested.The results showed that the PEG-200 and HBPA were compatible,and the OMMT was exfoliated in the compound.After the impregnating process,some proportion of HBPA and OMMT entered into the wood cell walls,and the PEG-200 acted as a crosslinking agent among them.However,when the OMMT content was 4%,some OMMT filling was found in the wood cell lumen.Significant improvements on physical and mechanical properties of the modified wood were obtained,while the groups contained OMMT showed further improvements.There was no obvious improvement between the wood modified with a 2%OMMT content and the wood modified with a 4%OMMTcontent.