Study of Thermal, Mechanical and Barrier Properties of Biodegradable PLA/PBAT Films with Highly Oriented MMT

Ludwiczak, Joanna; Frąckowiak, Stanisław; Leluk, Karol

doi:10.3390/ma14237189

Cited by 32 publications

(18 citation statements)

References 33 publications

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“…PLA, the major component of the studied compositions, presents a very high radiochemical yield of scission (14.5) [ 24 , 64 ] and a very low radiochemical yield of crosslinking (0.4) [ 24 , 64 ] when it is irradiated in air. It undergoes thermal and radiation oxidative degradations with the activation energy placed in the range of 92–118 kJ mol −1 [ 27 , 55 ]. On the other hand, the fragmentation of D,L-PLA backbones presents a high radical yield [G(R) = 2.4 at 77 K and 1.2 at 300 K].…”

Section: Resultsmentioning

confidence: 99%

“…The PLA-based composites have gained the name of biomaterials because they are appropriate for several friendly applications from the medical area up to food packaging. The associations of this polymer with polyethylene glycol and chitosan [ 50 ], carbon [ 51 ] or pineapple [ 52 ] or pulp [ 53 ] fibers, hemp component [ 54 ], montmorillonite [ 55 ], bamboo powder [ 56 ], alginate [ 57 ] are some of the examples which confirm the versatility of PLA. These materials are potential candidates for the usage addressed to ecological products.…”

Section: Introductionmentioning

confidence: 99%

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Stability Study of the Irradiated Poly(lactic acid)/Styrene Isoprene Styrene Reinforced with Silica Nanoparticles

Lupu

Mariș

Zaharescu³

et al. 2022

Materials

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In this paper, the stability improvement of poly(lactic acid) (PLA)/styrene-isoprene block copolymer (SIS) loaded with silica nanoparticles is characterized. The protection efficiency in the material of thermal stability is mainly studied by means of high accurate isothermal and nonisothermal chemiluminescence procedures. The oxidation induction times obtained in the isothermal CL determinations increase from 45 min to 312 min as the polymer is free of silica or the filler loading is about 10%, respectively. The nonisothermal measurements reveal the values of onset oxidation temperatures with about 15% when the concentration of SiO2 particles is enhanced from none to 10%. The curing assay and Charlesby–Pinner representation as well as the modifications that occurred in the FTIR carbonyl band at 1745 cm−1 are appropriate proofs for the delay of oxidation in hybrid samples. The improved efficiency of silica during the accelerated degradation of PLA/SIS 30/n-SiO2 composites is demonstrated by means of the increased values of activation energy in correlation with the augmentation of silica loading. While the pristine material is modified by the addition of 10% silica nanoparticles, the activation energy grows from 55 kJ mol−1 to 74 kJ mol−1 for nonirradiated samples and from 47 kJ mol−1 to 76 kJ mol−1 for γ-processed material at 25 kGy. The stabilizer features are associated with silica nanoparticles due to the protection of fragments generated by the scission of hydrocarbon structure of SIS, the minor component, whose degradation fragments are early converted into hydroperoxides rather than influencing depolymerization in the PLA phase. The reduction of the transmission values concerning the growing reinforcement is evidence of the capacity of SiO2 to minimize the changes in polymers subjected to high energy sterilization. The silica loading of 10 wt% may be considered a proper solution for attaining an extended lifespan under the accelerated degradation caused by the intense transfer of energy, such as radiation processing on the polymer hybrid.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stability Study of the Irradiated Poly(lactic acid)/Styrene Isoprene Styrene Reinforced with Silica Nanoparticles

Lupu

Mariș

Zaharescu³

et al. 2022

Materials

View full text Add to dashboard Cite

show abstract

“…Although PLA possesses many advantages for packaging, it also has some drawbacks that prevent its industrial exploitation, including poor toughness and sensitivity to thermal degradation [ 20 , 21 ]. One possible strategy to find more PLA commercial applications in the sustainable packaging field, while maintaining its biodegradability, consists of blending PLA with other BPs that have complementary characteristics [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Physical and Shape Memory Properties of Fully Biodegradable Poly(lactic acid) (PLA)/Poly(butylene adipate terephthalate) (PBAT) Blends

et al. 2023

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Biodegradable polymers have recently become popular; in particular, blends of poly(lactic acid) (PLA) and poly(butylene adipate terephthalate) (PBAT) have recently attracted significant attention due to their potential application in the packaging field. However, there is little information about the thermomechanical properties of these blends and especially the effect induced by the addition of PBAT on the shape memory properties of PLA. This work, therefore, aims at producing and investigating the microstructural, thermomechanical and shape memory properties of PLA/PBAT blends prepared by melt compounding. More specifically, PLA and PBAT were melt-blended in a wide range of relative concentrations (from 85/15 to 25/75 wt%). A microstructural investigation was carried out, evidencing the immiscibility and the low interfacial adhesion between the PLA and PBAT phases. The immiscibility was also confirmed by differential scanning calorimetry (DSC). A thermogravimetric analysis (TGA) revealed that the addition of PBAT slightly improved the thermal stability of PLA. The stiffness and strength of the blends decreased with the PBAT amount, while the elongation at break remained comparable to that of neat PLA up to a PBAT content of 45 wt%, while a significant increment in ductility was observed only for higher PBAT concentrations. The shape memory performance of PLA was impaired by the addition of PBAT, probably due to the low interfacial adhesion observed in the blends. These results constitute a basis for future research on these innovative biodegradable polymer blends, and their physical properties might be further enhanced by adding suitable compatibilizers.

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“…It is anticipated that, in the coming decades, biodegradable polymers will gradually replace traditional non-degradable plastics. Polylactic acid (PLA) is a biodegradable and biocompatible thermoplastic with a high modulus, high strength, high transparency, and excellent processing properties [ 1 , 2 , 3 ], which has led to it being widely used in the research of the modification of biodegradable materials. However, PLA has some inherent weaknesses, such as poor ductility and low tensile elongation at break [ 4 , 5 ], which greatly restricts the application of PLA in various fields.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Comonomers Added to Graft Copolymers on the Properties of PLA/PPC/PLA-g-GMA Blends

et al. 2022

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The melt-free radical grafting of glycidyl methacrylate (GMA) onto poly (lactic acid) (PLA) with styrene (St), α-methylstyrene (AMS), and epoxy resin (EP) as comonomers in a twin-screw extruder was used to prepare PLA-g-GMA graft copolymers. The prepared graft copolymers were then used as compatibilizers to prepare PLA/PPC/PLA-g-GMA blends by melt blending with PLA and polypropylene carbonate (PPC), respectively. The effects of different comonomers in the PLA-g-GMA graft copolymers on the thermal, rheological, optical, and mechanical properties and microstructure of the blends were studied. It was found that the grafting degree of PLA-g-GMA graft copolymers was increased to varying degrees after the introduction of comonomers in the PLA-g-GMA grafting reaction system. When St was used as the comonomer, the grafting degree of the PLA-g-GMA graft copolymer increased most significantly, from 0.8 to 1.6 phr. St as a comonomer also most improved the compatibility between PLA and PPC, and the haze of the blends was reduced while maintaining high transmittance. In addition, the PLA-g-GMA graft copolymer with the introduction of St as a comonomer significantly improved the impact toughness of the blends, while the thermal stability and tensile strength of the blends remained largely unchanged.

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Study of Thermal, Mechanical and Barrier Properties of Biodegradable PLA/PBAT Films with Highly Oriented MMT

Cited by 32 publications

References 33 publications

Stability Study of the Irradiated Poly(lactic acid)/Styrene Isoprene Styrene Reinforced with Silica Nanoparticles

Stability Study of the Irradiated Poly(lactic acid)/Styrene Isoprene Styrene Reinforced with Silica Nanoparticles

Evaluation of the Physical and Shape Memory Properties of Fully Biodegradable Poly(lactic acid) (PLA)/Poly(butylene adipate terephthalate) (PBAT) Blends

Effect of Different Comonomers Added to Graft Copolymers on the Properties of PLA/PPC/PLA-g-GMA Blends

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