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Effect of nanofillers characteristics and their selective localization on morphology development and rheological properties of melt-processed polylactide/poly(butylene adipate-co-terephthalate) blend composites

Salehiyan, Reza; Nofar, Mohammadreza; Malkappa, Kuruma; Ray, Suprakas Sinha

Authors

Reza Salehiyan

Mohammadreza Nofar

Kuruma Malkappa

Suprakas Sinha Ray



Abstract

This article reports the effects of the characteristics and selective localization of nanofillers on the morphology development and rheological properties of melt-processed polylactide/poly(butylene adipate-co-terephthalate) (PLA/PBAT) blend composites. Four types of nanofillers (1 wt%) are used: nanoclay (Cloisite30B [C30B]), carbon nanotubes (CNTs), nanosilica, and graphene oxide (GO). Transmission electron microscopy studies reveal that C30B is localized mainly at the PLA/PBAT interface, whereas silica, GO, and CNT are localized in PBAT droplets, although some CNTs also appear toward the interface inside the PBAT. Despite their selective localization inside the PBAT, CNTs are found to be the most effective particles for droplet size reduction, whereas silica nanoparticles are ineffective. The CNT bundles recoil during melt blending, and eventually, their breakage facilitates droplet breakup. The effects of nanofiller localization and annealing under dynamic shear on the blend morphologies are also explored through rheological analysis. The results show an anomalous relationship with the morphologies of the composites. It is also found that both coalescence and thermal degradation are involved in the annealing process of the blends. Interestingly, the CNT-filled composites may have been transformed into co-continuous-like structures during annealing, unlike the other blends studied here.

Journal Article Type Article
Acceptance Date Jul 30, 2020
Online Publication Date Sep 5, 2020
Publication Date 2020-11
Deposit Date Jan 30, 2023
Journal Polymer Engineering & Science
Print ISSN 0032-3888
Electronic ISSN 1548-2634
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 60
Issue 11
Pages 2749-2760
DOI https://doi.org/10.1002/pen.25505
Keywords blend; composites; nanofillers; PBAT; PLA; rheology