Study of flexible films prepared from PBAT/PLA blends reinforced with bio-CaCO3
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2016
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BRAZILIAN CONFERENCE ON COMPOSITE MATERIALS, 3rd
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Resumo
Plastics global annual production exceeds 250 million tons and more than 40 % of the total
plastic production is used as packaging materials. The most widely used materials include
polyethylene (PE) and polypropylene (PP), among others. However, petrochemical-based
conventional packaging materials are non-biodegradable and cause serious environmental problems.
Poly (lactic acid) (PLA), a linear aliphatic polymer is known as a biodegradable thermoplastic
polymer with widely potential applications. However, its high brittleness and low toughness limits its
application; blending PLA with PBAT (Poly (butylene adipate-co-terepthalate), an aliphatic-aromatic
copolyester, was the solution found due to its high toughness and biodegradability. Nevertheless,
differences between PLA and PBAT solubility parameter values lead to the formation of immiscible
blends as well as reduction in their mechanical performance. CaCO3 from avian eggshells, when added
in PLA / PBAT composites imparts optimization of mechanicals properties due to its characteristic as
reinforcing filler. This study aims to evaluate the effects of PLA addition in PBAT/PLA blends
especially concerned to mechanical and thermal properties of PLA / PBAT / CaCO3 flexible films.
Composites were prepared by melt processing, using a twin-screw extruder (L/D - 25). Before blown
film processing, the composites were cooled down for a better dimensional stability, pelletized and
dried at 60 ± 2 ºC for 24 h. The mechanical and thermal properties of obtained films were investigated
by tensile tests, DSC and TG / DTG. In addition, the morphology of blends and composites were also
evaluated by XRD and SEM analyses. The results showed important increase in crystallinity and
tensile strength at break of flexible films without severe loss in elongation percentage, due to CaCO3
additional in PBAT / PLA blend with higher PLA contents.
Como referenciar
CARDOSO, ELIZABETH C.L.; BUENO, NELSON R.; OLIVEIRA, RENE R.; MOURA, ESPERIDIANA A.B. Study of flexible films prepared from PBAT/PLA blends reinforced with bio-CaCO3. In: BRAZILIAN CONFERENCE ON COMPOSITE MATERIALS, 3rd, August 28-31, 2016, Gramado, RS. Proceedings... Disponível em: http://repositorio.ipen.br/handle/123456789/26743. Acesso em: 13 Mar 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.