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Effect of Mixing Strategy on the Structure-Properties of the PLA/PBAT Blends Incorporated with CNC

Sarul, Deniz Sema; Arslan, Dogan; Vatansever, Emre; Kahraman, Yusuf; Durmus, Ali; Salehiyan, Reza; Nofar, Mohammadreza


Deniz Sema Sarul

Dogan Arslan

Emre Vatansever

Yusuf Kahraman

Ali Durmus

Reza Salehiyan

Mohammadreza Nofar


Polylactide (PLA)/poly (butylene adipate-co-terephthalate) (PBAT) blend nanocomposites including 3 wt% of cellulose nanocrystals (CNCs) were prepared by melt compounding method in a twin-screw extruder and an internal mixer. Blend nanocomposites were formulated by diluting three different masterbatches prepared by solution casting method that contained 7 wt% of CNC. These masterbatches were: (m1) PLA/PBAT/CNC masterbatch; (m2) PLA/CNC masterbatch; and (m3) PBAT/CNC masterbatch. These were to explore how different preparation methods affect the dispersion and localization of CNC and hence the properties of PLA/PBAT/CNC blend nanocomposites. Scanning electron microscopy (SEM) was used to study the structural changes of the blends. Rheological properties of PLA/PBAT blends and PLA/PBAT/CNC blend nanocomposites were also investigated. In the samples prepared by internal mixer, the rheological behavior of blend nanocomposite prepared through premixing of CNC particles with PLA showed a transition from liquid-like to a gel-like behavior. According to the rheological results and differential scanning calorimetry (DSC) analysis, it was found that the CNC overall enhanced the viscoelastic properties of blends and improved the PLA crystallization, respectively. Dynamic mechanical analysis (DMA) illustrated that the incorporation of CNC also enhanced the elastic modulus of PLA/PBAT blends specifically above the glass transition temperature of PLA. The expected improvements in mechanical properties did not occur due to the possible existence of residual solvent in the blends.

Journal Article Type Article
Acceptance Date Jun 2, 2021
Publication Date 2022-07
Deposit Date Jan 30, 2023
Publicly Available Date Jan 31, 2023
Journal Journal Of Renewable Materials
Print ISSN 2164-6325
Publisher Tech Science Press
Peer Reviewed Peer Reviewed
Volume 10
Issue 1
Pages 149-164
Keywords Polylactide; poly(butylene adipate-co-terephthalate); cellulose nanocrystals blend; nanocomposite; morphology; rheology


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