Annealing Effect on Pla/Eva Blends Performance

PLA has aroused industrial and scientific interest in recent years, mainly due to its biodegradable character. However, PLA is brittle and displays low impact strength which has motivated researches to improve its toughness. The present work aims to produce PLA/EVA blends, and to investigate the EVA...

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Bibliographic Details
Published in:Journal of polymers and the environment 2022-02, Vol.30 (2), p.541-554
Main Authors: da Silva Barbosa Ferreira, Eduardo, Luna, Carlos Bruno Barreto, Siqueira, Danilo Diniz, Araújo, Edcleide Maria, de França, Danyelle Campos, Wellen, Renate Maria Ramos
Format: Article
Language:English
Subjects:
Annealing
Biodegradability
Biodegradation
Chemistry
Chemistry and Materials Science
Contact angle
Crystal structure
Crystallinity
Elongation
Environmental Chemistry
Environmental Engineering/Biotechnology
Fracture surfaces
Impact strength
Industrial Chemistry/Chemical Engineering
Materials Science
Mechanical properties
Mixtures
Modulus of elasticity
Original Paper
Polymer Sciences
Rheometry
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Summary:PLA has aroused industrial and scientific interest in recent years, mainly due to its biodegradable character. However, PLA is brittle and displays low impact strength which has motivated researches to improve its toughness. The present work aims to produce PLA/EVA blends, and to investigate the EVA effect on PLA as well as the annealing which carried out at 90 °C for 5 h and provided increase in crystallinity as observed by DRX and DSC, in the elastic modulus (tensile), impact strength, HDT, VST, shore D hardness and contact angle. Nevertheless, there were losses in elongation at break, no changes on the tensile and flexural strengths. Upon EVA addition, subtle increase was verified in viscosity as observed by torque rheometry, and new bands on FTIR spectra evidencing increase of PLA crystalline peaks. Regarding the fracture surfaces, SEM images illustrated upon addition of 30% EVA there was co-continuity of phases. Summing up, annealing together with EVA addition to PLA are efficient procedures and provide better performance to PLA compounds with wider range of properties and applications.
ISSN:1566-2543
1572-8919
DOI:10.1007/s10924-021-02220-4