Effect of processing conditions on structure and properties of PBAT/PLA in- situ fibrillation blends

Abstract

Abstract: Poly（butylene adipate terephthalate）（PBAT）/ poly（lactic acid）（PLA）（PBAT/PLA， 80/20）in-situ fibrillation blends were prepared by a single-screw melt-extrusion casting machine under various die temperature and stretching speed. The results indicated that at lower die temperature， with the increase of stretching speed， the diameter of PLA microfibers dwindles， the crystallinity degree enhance first and then lowers， the longitudinal tensile strength increases first and then decreases， and the mechanical anisotropy is obvious. When the die temperature was 150 ℃ and the stretching speed was 5.0 m/min， the number of dispersed phase PLA microfibers grow； the highest crystallinity of PBAT and PLA are 4.8 % and 23.7 %， respectively； the longitudinal tensile strength reaches the maximum of 29.8 MPa， which is at least 41 % higher than that of pure PBAT.

Key words: poly（butylene adipate terephthalate）, poly（lactic acid）, die temperature, drawing speed, in-situ fibrillation

References

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