Preparation and properties of PLA/PBAT/CB antistatic packaging materials
PLA/PBAT and PLA/PBAT/carbon black(CB)blends with different CB contents were prepared through melt blending.The effects of CB on the morphology,rheological behavior,crystallization properties,thermal stability,electrical conductance,and mechanical properties of the blends were investigated.Scanning electron microscopy observa-tion indicated that CB was selectively dispersed in the PBAT phase as a result of a thermodynamics theory.Further-more,a change in phase morphology could be clearly observed in the presence of 2 wt%CB.The rheological test results indicated that the viscosity of the PLA/PBAT/CB blends increased with an increase in the CB content.Differential scan-ning calorimetry analysis demonstrated that the crystallinity of PLA decreased with the addition of 1 wt%CB but in-creased with an increase in the CB content.Thermogravimetric analysis(TG)showed that the addition of CB improved the thermal stability of the blends slightly.The tensile and conductance test results indicated that adding appropriate amounts of CB could improve the electrical conductivity of the blends and maintain their mechanical properties.Howev-er,the addition of excessive amounts of CB reduced the toughness of the blends greatly.The blends exhibited tensile strength of 40.7 MPa,a Young′s modulus of 830 MPa,and elongation at break of 365%at a CB content of 2 wt%,and they obtained an electrical conductivity of 8.69×10-7 S/m,which is about 8 time higher than that of the blends without CB.This new type of compounding material exhibited suitable electrical conductance and good mechanical performance.This study provides a method for preparing biobased polymeric blends with good conductive properties,and the devel-oped blends exhibits application potential for antistatic packaging as a degradable material.
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