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Uncompatibilized PBAT/PLA Blends: Manufacturability, Miscibility and Properties

by 1,2,*, 1 and 1
Department of Circular and Bio-based Plastics, Fraunhofer UMSICHT, Institute for Environment, Safety and Energy Technology, Osterfelder Str. 3, 46047 Oberhausen, Germany
Department of Mechanical Engineering, Ruhr-University Bochum, Universitaetsstr. 150, 44780 Bochum, Germany
Author to whom correspondence should be addressed.
Materials 2020, 13(21), 4897;
Received: 27 September 2020 / Revised: 24 October 2020 / Accepted: 30 October 2020 / Published: 31 October 2020
(This article belongs to the Special Issue Synthesis, Properties and Applications of Polymer Blends)
Polymer blends of poly(butylene adipate-co-terephthalate) (PBAT) and polylactide (PLA) have been drawn attention due to the application potential as packaging or agricultural films. This study aims to determine the manufacturability, miscibility and mechanical properties of uncompatibilized PBAT/PLA blends prepared using different techniques. First, PBAT and PLA are melt-blended in a wide range of ratios from 90/10 to 10/90. The compounds are then processed into pressed panels, flat films and blown films. Finally, the thermal, morphological, rheological and mechanical properties of these blends are investigated. PBAT/PLA blends have a small difference of solubility parameters, predicting theoretically good miscibility. However, they show two almost unchanged glass transition temperatures in the DSC, phase separation in SEM and two relaxation mechanisms in the Cole–Cole plot. The phase morphology varies depending on both the blend ratios and the preparation techniques. Tensile tests indicate that with increasing PLA content the elongation at break decreases. A good correlation between the elongation at break and the tear propagation resistance is found. Furthermore, the trouser tear method is proven to be more applicable to differentiate highly extensible blown films compared with the Elmendorf tear method. View Full-Text
Keywords: blend; miscibility; morphology; PBAT; tear propagation resistance blend; miscibility; morphology; PBAT; tear propagation resistance
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MDPI and ACS Style

Su, S.; Duhme, M.; Kopitzky, R. Uncompatibilized PBAT/PLA Blends: Manufacturability, Miscibility and Properties. Materials 2020, 13, 4897.

AMA Style

Su S, Duhme M, Kopitzky R. Uncompatibilized PBAT/PLA Blends: Manufacturability, Miscibility and Properties. Materials. 2020; 13(21):4897.

Chicago/Turabian Style

Su, Shen, Mona Duhme, and Rodion Kopitzky. 2020. "Uncompatibilized PBAT/PLA Blends: Manufacturability, Miscibility and Properties" Materials 13, no. 21: 4897.

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