PLA／橡实淀粉／二聚脂肪酸聚酰胺复合材料研究

Study on Poly(lactic acid)/Acorn Starch/Dimer Fatty Acid Polyamide Composites

采用熔融挤出法制备了聚乳酸(PLA)/橡实淀粉(AS)/二聚脂肪酸聚酰胺(DAPA)三元复合材料。在保持PLA与AS质量比不变的情况下(60/40),研究了DAPA含量对复合材料的力学性能、疏水性能、热性能和熔体流动速率(MFR)的影响。研究表明,随DAPA添加量的增加,复合材料的疏水性和MFR逐渐提高,而复合材料的拉伸、弯曲强度呈先增大后减小的趋势,且当DAPA质量分数为2%时,复合材料具有最优的力学性能;DAPA的加入增强了PLA与AS的界面相容性,但在一定程度上降低了复合材料的玻璃化转变温度和初始热稳定性。

The ternary composites of poly（1actic acid）（PLA） ,acorn starch（AS） and dimer fatty acid polyamide（DAPA） were produced by hot-melt extrusion method. The effects of DAPA content on the mechanical,hydrophobic,thermal properties and melt fluidity of the composites were studied under the condition of invariable mass ratio of AS to PLA being 40/60. The results show that the hydrophobic property and melt fluidity of the composite increase with the increase of DAPA content,while the tensile and flexural strength firstly increase,then decrease with the increase of DAPA content. When the mass fraction of DAPA is 2%,the composite has highest mechanical properties. DAPA can improve the interfacial compatibility between PLA and acorn starch,but reduces the glass transition temperature and the initial thermal stability of the composites.