纤维素纳米纤丝/聚乳酸复合材料的制备及力学性能表征

Mechanical Properties Characterization of Cellulose Nanofibrils/PLA Composite and Its Preparation

通过熔融挤出法制备了纤维素纳米纤丝(CNFs)/聚乳酸(PLA)复合材料,考察了未改性、硅烷偶联剂(KH550)及表面活性剂(CTAB)改性CNFs对CNFs/PLA复合材料拉伸性能、流变行为及拉伸断面形貌的影响。结果表明:少量未改性CNFs与PLA有一定的相容性,但在CNFs含量较高时会导致力学性能下降;KH550改性CNFs可促进CNFs在PLA中的分散,当CNFs含量较高时具有增强效果;CTAB增容效果较差,使PLA的力学性能大幅下降。

The cellulose nanofibrils(CNFs)/polylactic acid(PLA) nanocomposites were prepared by melt extrusion.The effect of surface property of unmodified CNFs,KH550 modified CNFs and CTAB modified CNFs on the mechanical property,rheological behavior and fracture surfaces of CNFs/ PLA composites were investigated.The results show that: the small amount of unmodified CNFs has a certain compatibility with PLA,but the compatibility decreases at high CNFs content.The dispersion of KH550 modified CNFs in PLA is improved at high CNFs content.Moreover,CTAB has hardly no compatible effect on CNFs and PLA,the mechanical property of PLA decreases sharply with the addition of CTAB modified CNFs.