SYNTHESIS OF LIGNIN-G-MMA AND ITS UTILIZATION IN PVC/WOOD COMPOSITE
Lignin with low molecular weight (LA),fractionated from soda lignin by methanol extraction,was grafted with methyl methacrylate (MMA) and used for interfacial modification for poly (vinyl chloride) (PVC)/wood flour composites.By sequential extraction with chloroform and aqueous NaOH solution,the grafting product was separated into three fractions by the different solubility of various components in these solvents.The data of lignin contents in three fractions indicate that more than 80％ of the lignin participated in the copolymerization.The hydrophilic wood surface was transformed into a hydrophobic one by the grafting product treatment.The grafting product exhibited a positive influence on improving the mechanical performances of PVC/wood composites.In comparison with untreated ones,the tensile and impact strengths of composites containing 30 phr of wood flour treated with 2wt％ grafting product (MMA/LA = 2:1) were increased by 20.9％ and 35.3％,respectively.A significant increase in storage modulus (E) was observed upon the incorporation of treated wood flour.SEM images showed that the dispersion of treated wood flour in the polymer matrix was improved.It can be inferred that the polymer-wood interfacial bonding was strengthened.
lignin methyl methacrylate copolymerization wood composite poly (vinyl chloride)
Xiaopeng Yue Fangeng Chen Xuesong Zhou
State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou,510640,China.
国际会议
16th International Symposium on Wood,Fiber and Pulping Chemistry(第十六届木材、纤维及制浆化学国际会议)
天津
英文
1271-1276
2011-06-08（万方平台首次上网日期，不代表论文的发表时间）