Biodegradable poly (lactic acid)/Cellulose nanocrystals (CNCs) composite microcellular foam: Effect of nanofillers on foam cellular morphology, thermal and wettability behavior

Borkotoky, Shasanka Sekhar; Dhar, Prodyut; Katiyar, Vimal

doi:10.1016/j.ijbiomac.2017.08.036

Cited by 78 publications

(49 citation statements)

References 45 publications

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“…A sharp diffraction peak is observed for GR at 26.52°, which corresponds to the (002) graphitic carbon structure . The XRD pattern (Figure ) shows a broad band at 2θ ∼ 16.7° for PLA‐M and diluted‐MB composites corresponding to the (110) and (200) planes of PLA . The crystalline regime is reduced because of the fast cooling of the extruded PLA‐M and the composites from molten state to room temperature during fabrication of the composites.…”

Section: Resultsmentioning

confidence: 99%

Facile dispersion of exfoliated graphene/PLA nanocomposites via in situ polycondensation with a melt extrusion process and its rheological studies

Chakraborty

Gupta

Pugazhenthi

et al. 2018

J of Applied Polymer Sci

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This work attempted to improve the dispersion of graphene by coating poly(lactic acid) pellets with a masterbatch before melt processing. An in situ polycondensation reaction of lactic acid oligomer was utilized to prepare the masterbatch (MB) of exfoliated graphene (GR). MB dispersed composites of poly(lactic acid) (PLA) were fabricated by melt extrusion of MB‐coated PLA. One normal coated composite without MB coating (PLA‐M‐0.2GR) was fabricated for comparing properties. X‐ray diffraction, Raman spectroscopy, and morphological studies revealed better compatibility, dispersion, and interaction of GR for the diluted‐MB composite compared to the normal coated composite. The thermal stability, crystallization properties, and mechanical properties of the composites were examined, and the effect of short PLA chains in diluted‐MB composites was observed. The melt rheology nature of the composites was examined. Cole–Cole plots and Han plots suggested a uniform distribution of graphene. The sample PLA‐MB‐0.05GR showed improved modulus and elongation at break. It also showed better dispersion of GR, comparable thermal stability, good miscibility, good chain mobility, and high activation energy. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46476.

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Section: Resultsmentioning

confidence: 99%

Facile dispersion of exfoliated graphene/PLA nanocomposites via in situ polycondensation with a melt extrusion process and its rheological studies

Chakraborty

Gupta

Pugazhenthi

et al. 2018

J of Applied Polymer Sci

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“…The spongy materials can also be created by combining synthetic and natural materials [6]. Natural fillers such as chitosan [7] and cellulose [8,9] can be used to improve the properties of PLA-based foams. Chitosan is obtained from chitin in a deacetylation process.…”

Section: Introductionmentioning

confidence: 99%

Obtaining and Characterization of the PLA/Chitosan Foams with Antimicrobial Properties Achieved by the Emulsification Combined with the Dissolution of Chitosan by CO2 Saturation

Mania

Partyka²,

Pilch

et al. 2019

Molecules

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A new method of obtaining functional foam material has been proposed. The materials were created by mixing the poly lactic acid (PLA) solution in chloroform, chitosan (CS) dissolved in water saturated with CO2 and polyethylene glycol (PEG), and freeze-dried for removal of the solvents. The composite foams were characterized for their structural (SEM, FT-IR, density, porosity), thermal (DSC), functional (hardness, elasticity, swelling capacity, solubility), and biological (antimicrobial and cytotoxic) properties. Chitosan in the composites was a component for obtaining their foamed form with 7.4 to 22.7 times lower density compared to the neat PLA and high porosity also confirmed by the SEM. The foams had a hardness in the range of 70–440 kPa. The FT-IR analysis confirmed no new chemical bonds between the sponge ingredients. Other results showed low sorption capacity (2.5–7.2 g/g) and solubility of materials (less than 0.2%). The obtained foams had the lower Tg value and improved ability of crystallization compared to neat PLA. The addition of chitosan provides the bacteriostatic and bactericidal properties against Escherichia coli and Staphylococcus aureus. Biocompatibility studies have shown that the materials obtained are not cytotoxic to the L929 cell line.

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“…Hydrophobicity of PLA foam is required for some applications in biomedical field. Bionanofillers like chitosan, cellulose nanocrystals (CNC) can be utilized for improvement of properties of PLA foam. Chitosan is derived from chitin and it is the most recommended biopolymer for food packaging and biomedical applications .…”

Section: Introductionmentioning

confidence: 99%

Poly(lactic acid)/modified chitosan‐based microcellular foams: Thermal and crystallization behavior with wettability and porosimetric investigations

Borkotoky

Pal

Katiyar

2018

J of Applied Polymer Sci

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This article addresses a less expensive and elegant method for the fabrication of hydrophobic poly(lactic acid) (PLA)/modified chitosan (MC)-based bionanocomposite foams with high porosity (>~80%) and open cellular interconnected morphology. An increment of~2.3-fold of cell density and reduction of~1.3-fold of cell size are observed at highest loading of MC (i.e. 3 wt %). The MC also influences the hydrophobicity (up to~10 increment in contact angle) of the foams. Structure-property relationship of the fabricated foams has been investigated along with wettability behavior. Thermal degradation kinetics and degradation mechanism of the fabricated foams have been investigated by using different approaches like modified Coats Redfern (modified CR), Flynn-Wall-Ozawa (FWO), Kissinger, and Criado. Crystallization behavior of the fabricated foams are also investigated. Increase in surface area with MC-loading and nucleating behavior of MC in the PLA matrix is confirmed by the porosimetric investigation of the fabricated foams.

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Biodegradable poly (lactic acid)/Cellulose nanocrystals (CNCs) composite microcellular foam: Effect of nanofillers on foam cellular morphology, thermal and wettability behavior

Cited by 78 publications

References 45 publications

Facile dispersion of exfoliated graphene/PLA nanocomposites via in situ polycondensation with a melt extrusion process and its rheological studies

Facile dispersion of exfoliated graphene/PLA nanocomposites via in situ polycondensation with a melt extrusion process and its rheological studies

Obtaining and Characterization of the PLA/Chitosan Foams with Antimicrobial Properties Achieved by the Emulsification Combined with the Dissolution of Chitosan by CO2 Saturation

Poly(lactic acid)/modified chitosan‐based microcellular foams: Thermal and crystallization behavior with wettability and porosimetric investigations

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