Bionanocomposites of PLA/PBAT/organophilic clay: preparation and characterization

Abstract

The objective of this study was to develop bionanocomposites from blends of poly(lactic acid) (PLA) and poly(butylene adipate-co-terephthalate) (PBAT) and from 3% and 6% bentonite clay. Initially, the bentonite clay was treated with Praepagen salt, and the properties of the modified clay were evaluated. After the organophilization of the clay was completed, 50:50 blends of PLA/PBAT were prepared, and 3 and 6% clay was added. To test the dispersion of the system, the blending sequence was performed using eight different sequences for the addition of clay to the PLA/PBAT matrices. The mixtures were prepared in a twin screw extruder, and the specimens were subsequently injection molded. The investigated mechanical and morphological properties included the yield strength, yield strain, tensile and bending elastic modulus, and scanning and transmission electron microscopy analyses. The results of this study showed increases of the mechanical properties when nanoparticles were added and the formation of bionanocomposites with intercalated structures.

From disposal to sustainable development: technological potential of poly(lactic acid) (PLA) blends with 3D filament waste

“…Figure 6 shows the results of the elastic modulus of neat PLA, PLAr and blends (PLA/PLAr), respectively. The PLA presented an elastic modulus around 1219.5 MPa, a typical value for fragile polymers (Barbosa et al, 2019). The elastic module of the PLAr was approximately 1139.3 MPa, corresponding to a slight decrease of 6.6%, in relation to the reference specimen of PLA.…”

DETERMINATION OF THE VISCOSITY TEMPERATURE COEFFICIENT (β) AND PSEUDOPLASTIC INDEX (n) OF POLY(LACTID ACID) (PLA)

“…PLA is considered an ecological thermoplastic synthesized from lactic acid derived from renewable sources [16]. Regarding the mechanical properties, PLA has high mechanical strength and elastic modulus.…”

Mechanical, barrier, thermal, surface hydrophobicity, optical and antibacterial properties of PBAT biopolymer after addition of natural plasticizer and silica nanoparticles

“…The tensile strength modulus and glass transition temperature of PLA-based biocomposite films incorporating mesoporous silica NPs (MSNPs) improved, whereas PLA/MSNPs combined with CEO enhanced antibacterial efficacy against microbial strains (Lu et al , 2021). Similarly, the active PBAT composite film incorporated with various quantities of oregano essential oil for fish fillet storage exhibits high antimicrobial resistance against S. aureus and psychrotrophic microbes (Cardoso et al , 2017).…”

“…Subsequently, active packaging is a novel technology for the control of pathogens and microorganisms in food products to enhance their shelf life. The addition of organophilic clay to the polylactic acid (PLA)/PBAT blend increases the hybrid composite film's mechanical characteristics (Barbosa et al, 2019). The addition of Zinc Oxide Nanoparticles (ZnONPs) to the PLA/PBAT composite film improved mechanical properties, barrier properties, and antibacterial activity against E. coli and L. monocytogenes (Shankar and Rhim, 2016).…”