A study of the thermodynamics of chitosan interaction with polyvinyl alcohol and polyethylene oxide by differential scanning calorimetry

Sashina, E. S.; Vnuchkin, A. V.; Novoselov, N. P.

doi:10.1134/s107042720610017x

Cited by 19 publications

(8 citation statements)

References 11 publications

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“…This improvement of tensile strength is related to an increase in the packing density of the polymer chains in blends through filling of the cavities in the structure of MC by flexible PAA, as well as to an attractive interaction between the polymer components. Results obtained are in agreement with the experimental results of Sashina, Vnuchkin, and Novoselov (2006). The tensile properties confirm with DSC that pH improves significantly the physico-mechanical properties of the blends over the entire range of compositions at pH = 4.…”

Section: Tensile Strengthsupporting

confidence: 94%

“…Pure M 1 and M 2 start to degrade at 362.5 and 325 • C, respectively. This behavior is in good agreement with the results obtained by other authors (Simanovich, Petropavlovskiy, Larina, Sazanov, & Stepanov 1991;Sashina, Vnuchkin, & Novoselov, 2006) for thermal degradation of MC, according to whom the mechanism of MC degradation includes the parallel processes of dehydration and demethoxylation ( OCH 3 , CH 2 OCH 3 ). Fig.…”

Section: Thermogravimetric Analysis (Tga)supporting

confidence: 91%

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Effect of pH on the physico-mechanical properties and miscibility of methyl cellulose/poly(acrylic acid) blends

Negim

Nurpeissova

Mangazbayeva

et al. 2014

Carbohydrate Polymers

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The miscibility behavior and physico-mechanical properties between methyl cellulose (MC) of different molecular weights (4 × 10(4) and 8.3 × 10(4)g/mol) and poly(acrylic acid) (PAA) were studied by viscometry, differential scanning calorimetry (DSC), thermal gravimetric analysis (TGA), tensile strength and scanning electron microscopy (SEM) using water as a solvent. Various formulations were designed to investigate the effects of process variables such as pH on the physico-mechanical and miscibility properties of MC/PAA blends. The rheological features for the obtained blends are strongly dependent on the molecular weight of the MC used and pH. The viscosity measurements showed that all blends have non-Newtonian shear thinning (pseudoplastic) behavior. These blends have a single glass transition indicating that these blends are able to form a miscible phase due to the formation of hydrogen bonds between the hydroxyl group of MC and the carboxyl group of PAA. The MC/PAA blends exhibit good mechanical properties, thermal stability, characteristics of a MC-PAA polymer network. SEM of the blends showed no phase separation, when compared with the pure MC and PAA.

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Section: Tensile Strengthsupporting

confidence: 94%

Section: Thermogravimetric Analysis (Tga)supporting

confidence: 91%

Effect of pH on the physico-mechanical properties and miscibility of methyl cellulose/poly(acrylic acid) blends

Negim

Nurpeissova

Mangazbayeva

et al. 2014

Carbohydrate Polymers

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“…Thus, in the case of nonwoven CS ( Figure 4 (3)), the signal was more intense in the 2θ range of 19–24° than in the X-ray pattern of the CS film ( Figure 4 (2)). This finding supported the presence of PEO and an interaction between CS and PEO arising during electrospinning, as confirmed by the literature data [ 42 ]. The presence of PEO and CNW in the nonwoven ALG&CNW ( Figure 5 (3)) led to some changes in its structure when compared with that of the ALG film ( Figure 5 (2)).…”

Section: Resultssupporting

confidence: 91%

“…The swelling of the bilayer scaffold ( Table 2 ) was determined from the properties of the initial polymers and the changes that occurred during electrospinning and subsequent processing. The strong intermolecular interactions between CS and PEO that arose during electrospinning caused a partial loss of solubility in water of nonwoven CS [ 42 , 43 ]. Subsequent heating of the nonwoven CS led to a solubility loss and a reduction in the degree of swelling in water and in physiological saline ( Table 2 ); these changes were associated with the formation of amide crosslinks [ 44 ].…”

Section: Resultsmentioning

confidence: 99%

Cytocompatibility of Bilayer Scaffolds Electrospun from Chitosan/Alginate-Chitin Nanowhiskers

et al. 2020

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In this work, a bilayer chitosan/sodium alginate scaffold was prepared via a needleless electrospinning technique. The layer of sodium alginate was electrospun over the layer of chitosan. The introduction of partially deacetylated chitin nanowhiskers (CNW) stabilized the electrospinning and increased the spinnability of the sodium alginate solution. A CNW concentration of 7.5% provided optimal solution viscosity and structurization due to electrostatic interactions and the formation of a polyelectrolyte complex. This allowed electrospinning of defectless alginate nanofibers with an average diameter of 200–300 nm. The overall porosity of the bilayer scaffold was slightly lower than that of a chitosan monolayer, while the average pore size of up to 2 μm was larger for the bilayer scaffold. This high porosity promoted mesenchymal stem cell proliferation. The cells formed spherical colonies on the chitosan nanofibers, but formed flatter colonies and monolayers on alginate nanofibers. The fabricated chitosan/sodium alginate bilayer material was deemed promising for tissue engineering applications.

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“…The hydrophilicity of the obtained bilayer nonwoven material (Table 1) was determined by the properties of the initial polymers and the changes they underwent during electrospinning and subsequent processing. The intense intermolecular interactions occurring between CS and PEO during electrospinning caused a partial loss of solubility in water in the nonwoven material based on CS [47,48]. Subsequent heating of the nonwoven material led to the loss of solubility and a reduction in the degree of swelling in water and the physiological solution (Table 1, entry 1); these changes were associated with the formation of amide crosslinks [49].…”

Section: Resultsmentioning

confidence: 99%

Electrospun Bilayer Chitosan/Hyaluronan Material and Its Compatibility with Mesenchymal Stem Cells

et al. 2019

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A bilayer nonwoven material for tissue regeneration was prepared from chitosan (CS) and hyaluronic acid (HA) by needleless electrospinning wherein 10–15 wt% (with respect to polysaccharide) polyethylene oxide was added as spinning starter. A fiber morphology study confirmed the material’s uniform defect-free structure. The roughness of the bilayer material was in the range of 1.5–3 μm, which is favorable for cell growth. Electrospinning resulted in the higher orientation of the polymer structure compared with that of corresponding films, and this finding may be related to the orientation of the polymer chains during the spinning process. These structural changes increased the intermolecular interactions. Thus, despite a high swelling degree of 1.4–2.8 g/g, the bilayer matrix maintained its shape due to the large quantity of polyelectrolyte contacts between the chains of oppositely charged polymers. The porosity of the bilayer CS–HA nonwoven material was twice lower, while the Young’s modulus and break stress were twice higher than that of a CS monolayer scaffold. Therefore, during the electrospinning of the second layer, HA may have penetrated into the pores of the CS layer, thereby increasing the polyelectrolyte contacts between the two polymers. The bilayer CS–HA scaffold exhibited good compatibility with mesenchymal stem cells. This characteristic makes the developed material promising for tissue engineering applications.

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A study of the thermodynamics of chitosan interaction with polyvinyl alcohol and polyethylene oxide by differential scanning calorimetry

Cited by 19 publications

References 11 publications

Effect of pH on the physico-mechanical properties and miscibility of methyl cellulose/poly(acrylic acid) blends

Effect of pH on the physico-mechanical properties and miscibility of methyl cellulose/poly(acrylic acid) blends

Cytocompatibility of Bilayer Scaffolds Electrospun from Chitosan/Alginate-Chitin Nanowhiskers

Electrospun Bilayer Chitosan/Hyaluronan Material and Its Compatibility with Mesenchymal Stem Cells

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