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

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 masterbatc...

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Bibliographic Details
Published in:Journal of renewable materials 2022, Vol.10 (1), p.149-164
Main Authors: Sema Sarul, Deniz, Arslan, Dogan, Vatansever, Emre, Kahraman, Yusuf, Durmus, Ali, Salehiyan, Reza, Nofar, Mohammadreza
Format: Article
Language:English
Subjects:
Calorimetry
Cellulose
Crystallization
Differential scanning calorimetry
Dynamic mechanical analysis
Glass transition temperature
Localization
Mechanical properties
Mixtures
Modulus of elasticity
Nanocomposites
Nanocrystals
Polylactic acid
Premixing
Rheological properties
Rheology
Scanning electron microscopy
Transition temperatures
Twin screw extruders
Viscoelasticity
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Summary: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.
ISSN:2164-6341
2164-6325
2164-6341
DOI:10.32604/jrm.2022.017003