乙二醇二甲基丙烯酸酯原位聚合对杨木力学性能的改善

Improvement of Mechanical Properties of Poplar Wood by In-situ Polymerization of Ethylene Glycol Dimethacrylate

选用具有不饱和双端基的乙二醇二甲基丙烯酸酯(EGDMA)作为改性剂,通过其在杨木多孔细胞腔结构中的原位聚合对木材的力学性能进行改良,以期赋予杨木高附加值用途。SEM观察和FTIR分析表明,EGDMA单体在木材细胞腔中原位聚合成聚合物,并均匀填充细胞腔;EGDMA聚合形成的聚合物冲击断面呈韧性断裂状态。EGDMA聚合制得的木材—聚合物复合材料的冲击韧性、顺纹抗压强度、弹性模量、硬度分别较杨木未处理材提高了137%、60%、78%和147%。

With the purpose of value-added applications of poplar wood , we employed ethylene glycol dimethacrylate （ EGDMA） with double end groups of C=C as modifier to improve the mechanical properties of poplar wood by preparing into wood -polymer composite through in-situ polymerization of the monomer within the cellular structure .By SEM and FTIR , EGDMA monomer in situ polymerized into polymer and fully filled up wood cell lumen , and the resultant polymer presented ductile fracture morphology on the impact fracture surface .Compared to the untreated poplar wood , the mechanical properties of the wood-PEGDMA composite including impact toughness , compression strength parallel to the grain , modulus of elasticity and hardness were increased by 137%, 60%, 78%and 147%, respectively .