scholarly journals Blending of Cellulose and Chitosan in Alkyl Imidazolium Ionic Liquids

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Olga Kuzmina ◽  
Thomas Heinze ◽  
Dariusz Wawro
Keyword(s):  
Mechanical Properties ◽  
Ionic Liquids ◽  
Ethyl Acetate ◽  
Cellulose Film ◽  
Imidazolium Ionic Liquids ◽  
Pure Cellulose ◽  
Polymer Aggregates ◽  
Chitosan Films ◽  
Chitosan Blends ◽  
Blended Film

The production of cellulose/chitosan blends in alkyl imidazolium ionic liquids (ILs) was studied in this work. Selected organic solvents, such as dimethyl sulfoxide, ethyl acetate, and diethyl ether, were used as cosolvents. The addition of cosolvents decreased the viscosity of cellulose/chitosan solutions in ILs and facilitated the dissolution of polysaccharides, thereby decreasing the and polymer aggregates sizes in the solutions. The cellulose/chitosan films were produced from the studied solutions. The presence of one of cosolvent and ILs in the blended films was confirmed by FTIR spectroscopy. The blended film is stronger than pure cellulose film, and the addition of cosolvents has an influence on its mechanical properties.

scholarly journals Ionogels Obtained by Thiol-Ene Photopolymerization—Physicochemical Characterization and Application in Electrochemical Capacitors

Molecules ◽  
2021 ◽  
Vol 26 (3) ◽  
pp. 758
Author(s):  
Agnieszka Marcinkowska ◽  
Piotr Gajewski ◽  
Katarzyna Szcześniak ◽  
Mariola Sadej ◽  
Aneta Lewandowska
Keyword(s):  
Mechanical Properties ◽  
Ionic Liquids ◽  
Electrochemical Properties ◽  
Intermolecular Interactions ◽  
Polymer Matrix ◽  
Electrochemical Capacitors ◽  
Physicochemical Characterization ◽  
Imidazolium Ionic Liquids ◽  
Sem Micrograph

Flexible ionogels with good mechanical properties were obtained in situ by thiol-ene photopolymerization of trimethylolpropane tris(3-mercaptopropionate) (TMPTP) and 1,3,5-triallyl-1,3,5-triazine-2,4,6(1H,3H,5H)-trione (TATT) (with C=C: SH ratio 1:1) in four imidazolium ionic liquids (1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide—EMImNTf2, 1-ethyl-3-methylimidazolium trifluoromethanesulfonate-EMImOTf, 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide-BMImNTf2, and 1-butyl-3-methylimidazolium trifluoromethanesulfonate—BMImOTf) used in the range 50 to 70 wt.%. The mechanical and electrochemical properties of obtained ionogels were examined. Ionogels with ionic liquids (ILs) with NTf2− anion are more puncture resistant than with OTf− anion. Moreover, ionogels with the NTF2− anion have better electrochemical properties than those with the OTf− anion. Although it should be noted that ionogels with the EMIm+ cation have a higher conductivity than the BMIm+. This is connected with intermolecular interactions between polymer matrix and IL related to the polarity of IL described by the Kamlet-Taft parameters. These parameters influence the morphology of the polymer matrix (as shown by the SEM micrograph), which is formed by interconnected polymer spheres.

scholarly journals Controlling surface chemistry and mechanical properties of metal ionogels through Lewis acidity and basicity

2021 ◽  
Vol 9 (8) ◽  
pp. 4679-4686
Author(s):  
Coby J. Clarke ◽  
Richard P. Matthews ◽  
Alex P. S. Brogan ◽  
Jason P. Hallett
Keyword(s):  
Mechanical Properties ◽  
Ionic Liquids ◽  
Ethylene Glycol ◽  
Surface Chemistry ◽  
Lewis Acidity ◽  
Metal Species ◽  
Poly Ethylene Glycol ◽  
Acidity And Basicity ◽  
Poly Ethylene

Gels prepared from metal containing ionic liquids with cross-linked poly(ethylene glycol) have surface compositions and mechanical properties that can be controlled by Lewis basicity and acidity of the metal species.

scholarly journals Is Dialdehyde Chitosan a Good Substance to Modify Physicochemical Properties of Biopolymeric Materials?

2021 ◽  
Vol 22 (7) ◽  
pp. 3391
Author(s):  
Sylwia Grabska-Zielińska ◽  
Alina Sionkowska ◽  
Ewa Olewnik-Kruszkowska ◽  
Katarzyna Reczyńska ◽  
Elżbieta Pamuła
Keyword(s):  
Mechanical Properties ◽  
Tissue Engineering ◽  
Physicochemical Properties ◽  
Silk Fibroin ◽  
Three Dimensional ◽  
Microscopy Imaging ◽  
Maximum Deformation ◽  
One Step ◽  
Chitosan Blends ◽  
Fourier Transfer Infrared Spectroscopy

The aim of this work was to compare physicochemical properties of three dimensional scaffolds based on silk fibroin, collagen and chitosan blends, cross-linked with dialdehyde starch (DAS) and dialdehyde chitosan (DAC). DAS was commercially available, while DAC was obtained by one-step synthesis. Structure and physicochemical properties of the materials were characterized using Fourier transfer infrared spectroscopy with attenuated total reflectance device (FTIR-ATR), swelling behavior and water content measurements, porosity and density observations, scanning electron microscopy imaging (SEM), mechanical properties evaluation and thermogravimetric analysis. Metabolic activity with AlamarBlue assay and live/dead fluorescence staining were performed to evaluate the cytocompatibility of the obtained materials with MG-63 osteoblast-like cells. The results showed that the properties of the scaffolds based on silk fibroin, collagen and chitosan can be modified by chemical cross-linking with DAS and DAC. It was found that DAS and DAC have different influence on the properties of biopolymeric scaffolds. Materials cross-linked with DAS were characterized by higher swelling ability (~4000% for DAS cross-linked materials; ~2500% for DAC cross-linked materials), they had lower density (Coll/CTS/30SF scaffold cross-linked with DAS: 21.8 ± 2.4 g/cm3; cross-linked with DAC: 14.6 ± 0.7 g/cm3) and lower mechanical properties (maximum deformation for DAC cross-linked scaffolds was about 69%; for DAS cross-linked scaffolds it was in the range of 12.67 ± 1.51% and 19.83 ± 1.30%) in comparison to materials cross-linked with DAC. Additionally, scaffolds cross-linked with DAS exhibited higher biocompatibility than those cross-linked with DAC. However, the obtained results showed that both types of scaffolds can provide the support required in regenerative medicine and tissue engineering. The scaffolds presented in the present work can be potentially used in bone tissue engineering to facilitate healing of small bone defects.

scholarly journals Carbon dioxide capture using water-imidazolium ionic liquids-amines ternary systems

2021 ◽  
Vol 105 ◽  
pp. 103210
Author(s):  
Mariusz Zalewski ◽  
Tomasz Krawczyk ◽  
Agnieszka Siewniak ◽  
Aleksander Sobolewski
Keyword(s):  
Carbon Dioxide ◽  
Ionic Liquids ◽  
Carbon Dioxide Capture ◽  
Ternary Systems ◽  
Imidazolium Ionic Liquids

Degradation of imidazolium ionic liquids in a thermally activated persulfate system

2021 ◽  
Vol 412 ◽  
pp. 128624
Author(s):  
Tian-Lin Ren ◽  
Xi-Wen Ma ◽  
Xiao-Qiong Wu ◽  
Li Yuan ◽  
Yang-Li Lai ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Imidazolium Ionic Liquids ◽  
Thermally Activated ◽  
Activated Persulfate

scholarly journals Understanding the Barrier and Mechanical Behavior of Different Nanofillers in Chitosan Films for Food Packaging

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 721 ◽  
Author(s):  
João Pires ◽  
Camila Damásio de Paula ◽  
Victor Gomes Lauriano Souza ◽  
Ana Luísa Fernando ◽  
Isabel Coelhoso
Keyword(s):  
Mechanical Properties ◽  
Mechanical Behavior ◽  
Food Packaging ◽  
Scientific Research ◽  
Barrier Properties ◽  
Plastic Pollution ◽  
Functional Attributes ◽  
Chitosan Films ◽  
Commercial Applications ◽  
Innovative Techniques

The continuous petroleum-based plastics manufacturing generates disposal issues, spreading the problem of plastic pollution and its rise in the environment. Recently, innovative techniques and scientific research promoted biopolymers as the primary alternative for traditional plastics, raising and expanding global bioplastic production. Due to its unmatched biological and functional attributes, chitosan (Ch) has been substantially explored and employed as a biopolymeric matrix. Nevertheless, the hydrophilicity and the weak mechanical properties associated with this biopolymer represent a significant intrinsic restriction to its implementation into some commercial applications, namely, in food packaging industries. Distinct methodologies have been utilized to upgrade the mechanical and barrier properties of Ch, such as using organic or inorganic nanofillers, crosslinkers, or blends with other polymers. This review intends to analyze the most recent works that combine the action of different nanoparticle types with Ch films to reinforce their mechanical and barrier properties.

α−Fe2O3/rGO cooperated with tri-alkyl-substituted-imidazolium ionic liquids for enhancing oxygen sensing

2021 ◽  
Vol 341 ◽  
pp. 130029
Author(s):  
Wenyan Yin ◽  
Khaled Tawfik Alali ◽  
Milin Zhang ◽  
Jingyuan Liu ◽  
Dalei Song ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Oxygen Sensing ◽  
Imidazolium Ionic Liquids
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