Crystallization Behaviors,Thermal and Dielectric Properties of MXene and PBAT Co-modified PLA Composites
Using L-polylactic acid(PLLA)as the matrix,MXene as the strengthening phase and polybutylene adipate terephthalate(PBAT)as the toughening phase,PBAT@MXene hybrid additives were prepared by a solution blending method.A series of MXene,PBAT@MXene modified polylactic acid composites were prepared by a melt blending method.Subsequently,scanning electron microscope(SEM),wide-angle X-ray diffractometer(WAXD),polarizing microscope(POM),differential scanning calorimeter(DSC),dynamic thermomechanical analyzer(DMA),Vica softener and dielectric tester were used to examine the morphologies of sections,crystal forms,crystal morphologies,crystallization properties,thermodynamic properties,heat-resistant deformation and dielectric properties of polylactic acid and its composites.The results show that the surfaces of MXene are obviously coated by PBAT phase.Moreover,with the addition of MXene,the cross sections of PLA/MXene composites present brittle fracture characteristics,the crystal forms of PLA do not change,while the crystallinity of PLA decreases,and the heat deformation temperature and dielectric constant increase.When a 2%mass fraction PBAT@MXene and a 49%mass fraction D-polylactic acid(PDLA)are added into PLLA,the cross sections of PLLA/PDLA/PBAT@MXene composite emerge a ductile fracture morphology,and this composite possesses obvious stereo-composite crystals(SCs)with an increased crystallinity.The heat deformation temperature and dielectric constant of this composite are 31.7℃and 41.7%higher than those of pure PLLA,respectively.
万方数据
维普
