木质素/木粉/聚乳酸复合材料的制备及其性能

利用熔融共混的方法,以聚乳酸(PLA)为基材,填充木质素和木粉对其力学性能进行增强,通过控制木质素和木粉的比例制备了5种不同的木质素/木粉/聚乳酸复合材料.通过FTIR、XRD、TGA、SEM等测试方法研究了木质素含量、木粉含量对复合材料界面相容性、热性能、力学性能以及吸水率的影响.结果表明:以70%PLA作为基体,木质素与木粉以7:3的质量比例填充30%到PLA中,此时复合材料的界面相容性较好,综合力学性能优异,其中拉伸强度和弯曲强度分别达到最高,为65.59和5916.04MPa,弯曲模量为124.53MPa;饱和吸水率表现出较好的吸水性能,为5.72%.该研究结果对木质素/木粉/PLA复合体系的研究与应用具有一定的参考作用.

Preparation and Properties of Lignin/Wood Flour/PLA Composite

Five kinds of lignin/wood flour/poly (L-lactic acid) composite were prepared by melt blending with PLA as matrix resin , and mechanical properties were modified by lignin and wood flour filled with appropriate proportion. The effects of lignin and wood flour content on the interfacial compatibility , thermal properties , mechanical properties and water absorption of the composite were investigated by FT1R , XRD ,TGA ,SEM and other testing methods. The results showed that when the mass ratio of PLA was 70%, the lignin and wood flour were filled with 7:3 in the matrix, the composite had the best interfacial compatibility and excellent comprehensive mechanical properties, in which the tensile strength and bending strength were up to the highest 65. 59 and 5 916. 04 Mpa, the flexural modulus was 124. 53 Mpa. So the saturated water absorption rate was 5. 72%, showing better performance of water. The above research results were aimed at providing reference for the research and application of lignin/wood flour /PLA composite system.