Lignin/PLA复合材料的制备与性能

Preparation and Properties of Lignin/PLA Composites

将聚乳酸(PLA)与木质素(Lignin)通过熔融共混法制备了Lignin/PLA复合材料样品。通过熔体流动速率测试仪、万能试验机、冲击试验机及热台偏光显微镜对样品的结晶形态、熔融指数、拉伸性能及冲击性能进行了表征。结果表明:Lignin的加入可细化PLA的球晶尺寸,破坏PLA的球晶完整性。随着Lignin含量的增加,熔融指数、断裂伸长率及冲击强度呈先升后降趋势。当Lignin质量含量分别为15%时,样品的熔体流动速率有最大值,为60.5 g/(10 min),较空白样提升了23.67%;当Lignin质量含量分别为10%时,样品的断裂伸长率有最大值,为4.86%,较空白样提升了43.36%;当Lignin质量含量分别为5%时,样品的冲击强度有最大值,为3.65 kJ/m^(2),较空白样提升了95.19%。

Lignin/PLA composites were prepared by melt blending of poly(lactic acid)(PLA)and lignin(Lignin).The crystalline morphology,melt flow rate,tensile properties and impact properties of the samples were characterized by melt flow rate tester,universal testing machine,impact testing machine and hot stage polarizing microscope.The results show that the addition of Lignin could reduce the spherical size of PLA and disrupt its spherical regularity.The melt flow rate,elongation at break and impact strength increased first and then decreased with the increased of Lignin content.The melt flow rate of the sample reached a maximum value of 60.5 g/(10 min)when the Lignin content was 15%,which was 23.67%higher than that of the blank sample.The elongation at break of the sample reached a maximum value of 4.86%when the Lignin content was 10%,which was 43.36%higher than that of the blank sample.The impact strength of the sample reached a maximum value of 3.65 kJ/m^(2) when the content of Lignin was 5%,which was 95.19%higher than that of the blank sample.