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Impact modification of PLA using biobased biodegradable PHA biopolymers.

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Title: Impact modification of PLA using biobased biodegradable PHA biopolymers.
Authors: Burzic, Ivana1 (AUTHOR) i.burzic@wood-kplus.at, Pretschuh, Claudia1 (AUTHOR) c.pretschuh@wood-kplus.at, Kaineder, Dominik1 (AUTHOR) Dominik.Kaineder@jku.at, Eder, Gerhard1 (AUTHOR) Gerhard.Eder@jku.at, Smilek, Jiří1 (AUTHOR) smilek@fch.vut.cz, Másilko, Jiří1 (AUTHOR) masilko@fch.vut.cz, Kateryna, Wöss1 (AUTHOR) k.woess@wood-kplus.at
Source: European Polymer Journal. May2019, Vol. 114, p32-38. 7p.
Subjects: Polyhydroxyalkanoates, X-ray diffraction measurement, Crystal morphology, Injection molding, Lactic acid, Copolymers
Abstract: • Improvement of the impact toughness of PLA by blending with amorphous copolymer PHAs. • Amorphous PHA copolymers were demonstrated to be very effective in improving the toughness of PLA at modest loading levels of 10–20 wt%. • An annealing procedure was used to further improve tensile and impact properties of studied PLA/PHA blends. • An outstanding impact performance of PLA/PHA blends reported in this study could be further used to expand PLA application range. This work is focused on an approach to improve the impact toughness of poly (lactic acid) (PLA) without compromising the bio-based carbon content and compostability of PLA. According to the literature, low-crystallinity and amorphous polyhydroxyalkanoates (PHA) copolymers were demonstrated to be very effective in improving the toughness of PLA at modest loading levels of 10–20 wt%. The present study includes preparation and characterization of PLA/PHA blends with two different amorphous PHA copolymers. Another strategy for improvement of the impact performance of the prepared PLA/PHA blends was applying an annealing procedure after injection molding. Crystalline morphology and crystal modification before and after the annealing process of all prepared PLA/PHA blends as well as for the virgin PLA were studied by X-ray diffraction measurements. In the present study, an outstanding impact performance was achieved in the case of PLA/PHA2 blends. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:• Improvement of the impact toughness of PLA by blending with amorphous copolymer PHAs. • Amorphous PHA copolymers were demonstrated to be very effective in improving the toughness of PLA at modest loading levels of 10–20 wt%. • An annealing procedure was used to further improve tensile and impact properties of studied PLA/PHA blends. • An outstanding impact performance of PLA/PHA blends reported in this study could be further used to expand PLA application range. This work is focused on an approach to improve the impact toughness of poly (lactic acid) (PLA) without compromising the bio-based carbon content and compostability of PLA. According to the literature, low-crystallinity and amorphous polyhydroxyalkanoates (PHA) copolymers were demonstrated to be very effective in improving the toughness of PLA at modest loading levels of 10–20 wt%. The present study includes preparation and characterization of PLA/PHA blends with two different amorphous PHA copolymers. Another strategy for improvement of the impact performance of the prepared PLA/PHA blends was applying an annealing procedure after injection molding. Crystalline morphology and crystal modification before and after the annealing process of all prepared PLA/PHA blends as well as for the virgin PLA were studied by X-ray diffraction measurements. In the present study, an outstanding impact performance was achieved in the case of PLA/PHA2 blends. [ABSTRACT FROM AUTHOR]
ISSN:00143057
DOI:10.1016/j.eurpolymj.2019.01.060