木质素胺用于PVC/木粉复合材料界面改性的研究

Interfacial modification effect of lignin amine in PVC/wood composite

以碱木质素通过曼尼希反应合成木质素胺,将其作为界面改性剂用于PVC/木粉复合材料,对复合材料的力学性能、吸水性、流变性能、动态力学性能及形貌学特征等进行研究,对其界面改性机理进行探讨。与未处理木粉制备的复合材料相比,以木质素胺处理过的木粉(质量分数2%,氮元素含量8.18%)制备的复合材料,拉伸和冲击强度分别提高了21.0%和43.9%;木质素胺中氨基含量对复合材料力学性能的影响不明显。以木质素胺处理过的复合材料,吸水率有所降低,储能模量升高,加工热稳定性略有降低,但整体影响不大。SEM分析表明,木质素胺的引入,提高了PVC基体与木粉间的界面结合。

Lignin amine was synthesized from soda lignin via Mannich reaction and was used in interfacial modification for poly （vinyl chloride） （PVC）/wood composites. The PVC/wood composite was prepared from surface treated wood flour and polyvinyl chloride by melt compounding. The tensile and impact strengths of composites prepared from 30phr of wood flour treated with 2wt% lignin amine were increased by 21.0% and 43.9%, respectively than those prepared from untreated wood flour. The effect of nitrogen element content in lignin amine on the mechanical performance of composites is no obvious. Furthermore, lignin amine treatment could also significantly reduce the water absorption of composites. A significant increase in storage modulus （E＇） was observed upon incorporation of wood flour with lignin amine treatment. The improved dispersion of wood flour in polymer matrix was observed by SEM images when the wood flour was treated by lignin amine. The experimental data indicate that the polymer-wood interfacial combination is strengthened. However, the processing thermal stability of composites slightly lowered after lignin amine treatment.