Natural deep eutectic solvents as green plasticizers for chitosan thermoplastic production with controlled/desired mechanical and barrier properties

Galvis-Sánchez, Andrea C.; Castro, M. Cidália R.; Biernacki, Krzysztof; Gonçalves, M. P.; Souza, Hiléia K.S.

doi:10.1016/j.foodhyd.2018.04.026

Cited by 104 publications

(40 citation statements)

References 62 publications

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“…Transparent thin chitosan films were produced by thermo-compression molding, and film properties (mechanical and water resistance) varied depending on its composition/structure. A more homogenous surface, compact with lower water permeability and stronger resistance, were obtained for chitosan with lower DD and with the NADES CC/CA and CC/MA, while films produced with CC/glycerol resulted in a material with weaker properties [104].…”

Section: Novel Green Solvents As Plasticizers For Thermomechanical Trmentioning

confidence: 99%

“…Adding plasticizers (e.g., glycerol) to chitosan films, and applying thermomechanical treatment (mechanical kneading), allows to obtain a kind of thermoplastic material which grants good mechanical properties [103]. This process of plasticization by thermomechanical treatments can be a potential alternative to the traditional casting method of chitosan film production, which may also allow the preparation of these biodegradable films on a larger scale [104].…”

Section: Scale-up Productionmentioning

confidence: 99%

“…Natural deep eutectic solvents (NADES) prepared from cheap raw materials were tested to produce thermoplastic chitosan films [104]. Four types of NADESs based on choline chloride prepared with malic acid (MA), lactic acid (LA), citric acid, and glycerol were used as hydrogen bond donors, and as polymeric matrix, two chitosan with different deacetylation degrees (DD) (DD = 76 and 81).…”

Section: Novel Green Solvents As Plasticizers For Thermomechanical Trmentioning

confidence: 99%

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Chitosan Composites in Packaging Industry—Current Trends and Future Challenges

et al. 2020

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Chitosan-based composites play an important role in food packaging applications and can be used either as films or as edible coatings. Due to their high costs and lower performance (i.e., lower barrier against water vapor, thermal, and mechanical properties) when compared to the traditional petroleum-based plastics, the use of such biopolymers in large-scale is still limited. Several approaches of chitosan composites in the packaging industry are emerging to overcome some of the disadvantages of pristine polymers. Thus, this work intends to present the current trends and the future challenges towards production and application of chitosan composites in the food packaging industry.

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Section: Novel Green Solvents As Plasticizers For Thermomechanical Trmentioning

confidence: 99%

Section: Scale-up Productionmentioning

confidence: 99%

Section: Novel Green Solvents As Plasticizers For Thermomechanical Trmentioning

confidence: 99%

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Chitosan Composites in Packaging Industry—Current Trends and Future Challenges

et al. 2020

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“…Another DES, namely choline chloride/citric acid, increased the elongation of chitosan (DD = 76%) films. Homogeneous, hot pressed films could be produced with a chitosan:DES mass ratio of 70:30 at a compression temperature of 110 °C …”

Section: Chitin Biomassmentioning

confidence: 99%

Natural Polymers from Biomass Resources as Feedstocks for Thermoplastic Materials

Müller

Zollfrank

Schmid

2019

Macro Materials & Eng

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With the objective of a more sustainable circular economy, one long‐term goal is the utilization of renewable resources as feedstock for the production of polymer‐based materials. In order to successfully process such materials using existing industrial‐scale technologies or even recycling processes, the natural polymers must have thermoplastic properties. With only a few exceptions, natural polymers are not thermoplastic. However, chemical and physical modification techniques are able to induce thermoplasticity in natural polymers from biomass resources such as cellulose, lignin, and chitin. Modification techniques focus on masking the hydroxyl groups to disrupt dense hydrogen bonding and so enable polymer chain mobility upon heating. The introduction of long alkyl chains into the polymer backbone effectively improves the thermoplastic processing of natural polymers. With regard to polymer blending, chemical grafting and graft copolymerization are powerful tools for enhancing compatibility. For both chemical and physical modification, solvents such as ionic liquids and deep eutectic solvents are currently being explored for biomass and fiber processing and show promise for the future development of thermoplastic biopolymers. This review describes possible modifications, potential processing difficulties, and gives a summary of relevant studies described in the scientific literature.

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“…However, the formation of carbon-based polymer main chain does not allow biodegradation of these materials. The preparation of materials based on CS with LA and ChCl was reported and mechanical properties, water sorption and permeability for the materials containing 30 wt% of this NADES were studied [30]. The acetic acid solution (3%) was used for mixing of CS and NADES and hot-pressing was applied for formation of films.…”

Section: Introductionmentioning

confidence: 99%

Ionic Conductivity and Structure of Chitosan Films Modified with Lactic Acid-Choline Chloride NADES

et al. 2020

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The natural deep eutectic solvent (NADES) based on choline chloride (ChCl) and lactic acid (LA) was used for the preparation of chitosan (CS) films by the solution casting method. The content of NADES in films was from 0 to 82 wt%. The impact of NADES on the morphology and crystalline structure of films was investigated using scanning electron microscopy as well as wide-angle and small-angle X-ray scattering. The experimental results allow to propose CS chains swelling in NADES. FTIR spectroscopy confirms the interactions between CS and NADES components via the formation of hydrogen and ion bonds. The thermal properties of the composite films were studied by simultaneous thermogravimetric and differential thermal analysis. Thermomechanical analysis demonstrated appearance of two transitions at temperatures between −23 and −5 °C and 54–102 °C depending on NADES content. It was found that electrical conductivity of film with 82 wt% of NADES reaches 1.7 mS/cm. The influence of the composition and structure of films on the charge carriers concentration and their mobility is discussed.

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Natural deep eutectic solvents as green plasticizers for chitosan thermoplastic production with controlled/desired mechanical and barrier properties

Cited by 104 publications

References 62 publications

Chitosan Composites in Packaging Industry—Current Trends and Future Challenges

Chitosan Composites in Packaging Industry—Current Trends and Future Challenges

Natural Polymers from Biomass Resources as Feedstocks for Thermoplastic Materials

Ionic Conductivity and Structure of Chitosan Films Modified with Lactic Acid-Choline Chloride NADES

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