聚乳酸/三聚氯氰改性木粉/油胺复合材料的制备及表征

摘要

使用三聚氯氰(TCT)对原料杨木粉(RWF)进行改性,并使用改性木粉(TWF)与油胺(OAM)在聚乳酸(PLA)体系下反应后挤出制备复合材料.红外光谱表明:TCT的三嗪环结构连接到了木粉上,在反应挤出过程中,TWF接枝上了OAM.元素分析和滴定分析表明:TWF增加的氮元素与氯元素的物质的量比为2.91:1,TCT上3个活性氯中的两个参与了反应.OAM加入导致PLA产生了降解,但复合材料PLA/TWF/OAM降解弱于PLA/RWF/OAM;在相同OAM用量下,PLA/TWF/OAM拉伸强度和弯曲强度均优于PLA/RWF/OAM;在相同木粉用量下,PLA/TWF/OAM的熔体流动速率大于PLA/RWF.动态力学性能分析表明:在相同OAM用量下,PLA/TWF/OAM与PLA/RWF/OAM相比具有较高的玻璃化转变温度.%Raw wood flour (RWF) was modified with cyanuric chloride (TCT),and the modified wood flour (TWF) and oleyl amine (OAM) were used to prepare composites with poly(lactic acid) by reactive extrusion.FT-IR spectra indicated that the structure of TCT was attached to wood flour and OAM was grafted onto TWF in the progress of reactive extrusion.Elemental analysis and titration analysis showed that the molar ratio of nitrogen and chlorine of TWF was 2.91: 1 and two of three active chlorine of TCT were involved in the reaction.The addition of OAM led to the degradation of PLA.However,the degradation of PLA/TWF/OAM composites was weaker than that of PLA/RWF/OAM composites.PLA/TWF/OAM composites exhitbited better tensile strength and flexural strength than that of PLA/RWF/OAM composites under the same dosage of OAM.PLA/TWF/OAM composites had a greater melt flow rate than that of PLA/TWF composites under the same dosage of wood flour.DMA revealed that PLA/TWF/OAM composites had a higher glass transition temperature than that of PLA/RWF/OAM composites under the same dosage of OAM.