Aerogels from Chitosan Solutions in Ionic Liquids

Santos-López, Gonzalo; Argüelles‐Monal, Waldo; Carvajal-Millán, Elizabeth; López‐Franco, Yolanda L.; Recillas-Mota, Maricarmen T.; Lizardi‐Mendoza, Jaime

doi:10.3390/polym9120722

Cited by 30 publications

(32 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Chitosan (CS), a widely used polysaccharide, is the second largest renewable biopolymer after cellulose [2,3]. Chitosan is composed of β-(1-4)-D-glucosamine units and β-(1-4)-N-acetyl-glucosamine depending on the deacetylation of chitin [4]. Contrary to chitin, both amino and hydroxyl groups of chitosan can be selectively modified for versatile applications [5].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Graphene Oxide/Chitosan Composite Aerogels with High Mechanical Performance

Gong

Kang

et al. 2019

Polymers

View full text Add to dashboard Cite

Chitosan, a semi-crystalline biomolecule, has attracted wide attention due to its high synthesis flexibility. In this study, to improve the mechanical properties of chitosan aerogels (CSAs), graphene oxide (GO) was extracted and introduced into chitosan aerogels as fillers. The porous CSAs/GO composite aerogels were fabricated by an environmentally friendly freeze-drying process with different GO contents (0, 0.5, 1.0, 1.5, wt.%). The characteristics of the CSAs/GO were investigated by scanning electron microscopy (SEM), mechanical measurements and mercury porosimeter. The crystallinity of samples was characterized by X-ray diffraction (XRD). The mechanism of the effect of graphene oxide on chitosan was studied by Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). The results show that the microstructure of the samples is developed in the network structure. The porosity of CSAs/GO aerogels is as high as 87.6%, and the tensile strength of the films increased from 6.60 MPa to 10.56 MPa with the recombination of graphene oxide. The crystallinity (CrI) of composite aerogels increased from 27% to 81%, which indicates that graphene oxide improves the mechanical properties of chitosan by chemical crosslinking.

show abstract

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Graphene Oxide/Chitosan Composite Aerogels with High Mechanical Performance

Gong

Kang

et al. 2019

Polymers

View full text Add to dashboard Cite

show abstract

“…Chitosan is available from fungi, crustaceans, and plants [ 6 , 7 ]. As the second most abundant polysaccharide in nature [ 8 , 9 ], it is regarded as an eco-friendly material with advantages including safety, nontoxicity, edibility, biodegradability, and antimicrobial properties [ 10 , 11 , 12 , 13 ]. The cationic property (–NH 3 + ) of chitosan permits it to establish electrostatic interactions with other compounds, and confers antibacterial properties to composite films [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Sodium Trimetaphosphate on Chitosan-Methylcellulose Composite Films: Physicochemical Properties and Food Packaging Application

Wang

Liao

et al. 2019

Polymers

View full text Add to dashboard Cite

Environmentally friendly food packaging currently attracts much interest. Sodium trimetaphosphate (STMP) finds specialized applications in food, but it is rarely used as a crosslinking agent. In this study, STMP was used as a crosslinking agent to prepare chitosan/methylcellulose composite films. Both antibacterial and physicochemical properties of the composite film were improved by crosslinking with STMP. The crosslinked films, with good antibacterial activity (~99%), had increased tensile strength, a higher elongation at break, a lower swelling ratio and solubility, and a lower enzymatic degradation than the non-crosslinked films. Furthermore, the crosslinked films showed an excellent preservative effect on fresh-cut wax gourd after three days at room temperature. The obtained films crosslinked by STMP can be potentially applied to the food industry, such as food functional packaging, providing a novel alternative to traditional plastic packages.

show abstract

“…[159] Having shown great potential for cellulose dissolution, different ILs have been tested for chitin [159][160][161][162][163][164] and chitosan. [22,[163][164][165][166] However, differing results have been obtained regarding the solubility behavior. The latter mainly depends on the structural properties of chitin such as its polymorphic form, source, molecular weight, and degree of acetylation.…”

Section: Structure and Isolationmentioning

confidence: 99%

“…Furthermore, ILs have been reported as an alternative for direct extraction of chitin . Having shown great potential for cellulose dissolution, different ILs have been tested for chitin and chitosan . However, differing results have been obtained regarding the solubility behavior.…”

Section: Chitin Biomassmentioning

confidence: 99%

Natural Polymers from Biomass Resources as Feedstocks for Thermoplastic Materials

Müller

Zollfrank

Schmid

2019

Macro Materials & Eng

View full text Add to dashboard Cite

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.

show abstract

Aerogels from Chitosan Solutions in Ionic Liquids

Cited by 30 publications

References 42 publications

Synthesis and Characterization of Graphene Oxide/Chitosan Composite Aerogels with High Mechanical Performance

Synthesis and Characterization of Graphene Oxide/Chitosan Composite Aerogels with High Mechanical Performance

Effect of Sodium Trimetaphosphate on Chitosan-Methylcellulose Composite Films: Physicochemical Properties and Food Packaging Application

Natural Polymers from Biomass Resources as Feedstocks for Thermoplastic Materials

Contact Info

Product

Resources

About