PLA-PEG-PLA tri-block copolymers: Effective compatibilizers for promotion of the interfacial structure and mechanical properties of PLA/PBAT blends

The aim of this study was to obtain an effective compatibilizer for the blends of polylactic (PLA) and poly(butylene adipate-co-terephthalate) (PBAT). PLA-polyethylene glycol-PLA (PLA-PEG-PLA) tri-block copolymers with different chain lengths were synthesized to emulsify the interfacial layer and im...

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Veröffentlicht in:Polymer (Guilford) 2018-06, Vol.146, p.179-187
Hauptverfasser: Ding, Yue, Feng, Wutong, Lu, Bo, Wang, Pingli, Wang, Gexia, Ji, Junhui
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Sprache:eng
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Zusammenfassung:The aim of this study was to obtain an effective compatibilizer for the blends of polylactic (PLA) and poly(butylene adipate-co-terephthalate) (PBAT). PLA-polyethylene glycol-PLA (PLA-PEG-PLA) tri-block copolymers with different chain lengths were synthesized to emulsify the interfacial layer and improve the interfacial adhesion of PLA/PBAT blends. The structure of the tri-block was characterized, and the compatibilization effect was examined based on the microstructures and the thermodynamic, mechanical, and rheological properties of the blends. The tri-block copolymers exhibited attractive compatibilizing efficiency for PLA/PBAT blends when the segment ratio of ethylene glycol/lactic was 2.1. The elongation of the blends with the compatibilizer was as high as 173.4%, eight times more than the pristine blends. Moreover, there were typical sea-island microstructure changes to the continuous phase, and thread-like fibers appeared in the tensile-fracture images. The experimental results established that the PLA-PEG-PLA tri-block copolymers can act as an effective compatibilizer for PLA/PBAT blends to improve the interaction of the interface. [Display omitted] •The PLA-PEG-PLA tri-block copolymers were synthesized with definite structure.•The addition of E91L44 compatibilizer improved the toughness of samples by eight times.•The typical sea-island microstructure changes to the continuous phase.•Particle cavitation and interfacial debonding phenomena disappeared in the tensile samples.
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2018.05.037