Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 191, Issue -, Pages 540-547Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2021.09.097
Keywords
PLA; PBAT; UV screening
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Biodegradable composite films of PLA and PBAT were prepared by a co-precipitation and hot-pressing method, showing improved mechanical properties and UV barrier properties upon the addition of 4%wt PBAT. The potential for UV screening packaging applications is high due to the excellent thermal stability and satisfactory mechanical properties of the composite films.
Biodegradable poly (lactide) (PLA) and poly (butylene adipate-co-terephthalate) (PBAT) composite films were made by a co-precipitation and hot-pressing method. The property of composite films like the chemical interaction, phase morphology, mechanical properties, and thermal properties were studied. The Fourier transform infrared spectroscopy (FTIR) test manifested that there was a small amount of the transesterifications between the PBAT and PLA during hot pressing, which could improve the compatibility of the two phases. The tensile strength of the film only reduced by 7.4%, while the elongation at break was increased by 119.1% compared with PLA after adding 4%wt PBAT. The composite films showed a high Ultraviolet-visible (UV) light barrier property. The UV blocking rate of the composite after adding 4%wt PBAT was 6.95 times higher than that of pure PLA at 380 nm. The PLA/PBAT composite films with excellent thermal stability, satisfactory mechanical properties and UV-light barrier have high a possibility for an UV screening packaging application.
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