Thermal Properties of Salt and Base Forms of Chitosan

Dresvyanina, E. N.; Dobrovol’skaya, I. P.; Смирнов, В. Э.; Попова, Е. Н.; Власова, Е. Н.; Yudin, V. E.

doi:10.1134/s0965545x18020049

Cited by 16 publications

(8 citation statements)

References 13 publications

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“…In particular, that paper contains a detailed discussion of the contradictions in the literature related to the determination of the CS glass transition temperature. The thermophysical properties of CS in the basic and salt forms were also studied by DMA in [20]. The high glass transition temperatures obtained for CS confirm the conclusions made in [19].…”

Section: Introductionsupporting

confidence: 75%

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Thermal Properties and Structural Features of Multilayer Films Based on Chitosan and Anionic Polysaccharides

et al. 2021

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This study investigates the thermal and structural properties of multilayer composites based on chitosan (CS) and polyanions with different functionalities, including sodium sulfoethyl cellulose (SEC), sodium alginate (ALG), and sodium hyaluronate (HA). Unlike polyelectrolyte complexes (PECs) obtained by polymer mixing, the formation of a PEC layer by a process of layer-by-layer deposition of oppositely charged polymers is accompanied by the transformation of the CS polymorphic state, and this affects the relaxation and thermal properties of the resulting multilayer composite. X-ray diffraction analysis showed that the formation of the PEC layer in the CS/SEC multilayer film is accompanied by crystallization of the CS chains and the formation of a predominantly anhydrous CS modification. Thermogravimetric analysis of the CS/SEC film registers a high-temperature peak associated with the thermal decomposition of crystalline CS in the PEC composition. According to the dynamic mechanical analysis, the CS/SEC composite was characterized by a single glass transition temperature, indicating a strong interaction between the layers when using SEC (a strong acid salt) as the counterion to CS. For multilayer composites with weak polyacid salts (ALG and HA), the crystallization of CS in the PEC layer is weaker, as reflected in the thermal degradation of these films. A high-temperature peak is recorded in the thermal decomposition of CS/HA and is absent in the case of CS/ALG. Dynamic mechanical analysis of the CS/ALG composite showed two glass transition temperatures close to those of the original polymers, indicating weak PEC formation. The CS/HA composite showed an intermediate response. Thus, the effect of the PEC layer on the properties of the poly-layer composites decreases in the order CS/SEC > CS/HA > CS/ALG.

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Section: Introductionsupporting

confidence: 75%

“…As can be seen, no noticeable transitions were observed up to 200 • C for all samples. The week maxima of tgδ in the 150-200 • region (Figure 6, curve 4) is related to molecular mobility of chitosan caused by the removal of absorbed and residues of acetic acid [20].…”

Section: Dynamic Mechanical Analysis Of the Cs Polyanion Filmsmentioning

confidence: 99%

Thermal Properties and Structural Features of Multilayer Films Based on Chitosan and Anionic Polysaccharides

et al. 2021

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“…The samples were kept at each partial water vapour pressure until sorption equilibrium was established, where the equilibrium sorption values were established for 3–7 weeks. Before measurement, the samples were dried at 80 °C to a constant weight [15]; the control over the moisture content was carried out by the weight method.…”

Section: Methodsmentioning

confidence: 99%

Effect of Chitin Nanofibrils on Biocompatibility and Bioactivity of the Chitosan-Based Composite Film Matrix Intended for Tissue Engineering

et al. 2019

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This paper discusses the mechanical and physicochemical properties of film matrices based on chitosan, as well as the possibility of optimizing these properties by adding chitin nanofibrils. It is shown that with the introduction of chitin nanofibrils as a filler, the mechanical stability of the composite materials increases. By varying the concentration of chitin nanofibrils, it is possible to obtain a spectrum of samples with different bioactive properties for the growth of human dermal fibroblasts. Film matrices based on the nanocomposite of chitosan and 5 wt % chitin nanofibrils have an optimal balance of mechanical and physicochemical properties and bioactivity in relation to the culture of human dermal fibroblasts.

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“…при температуре 22 • С. На температурных зависимостях модуля упругости наблюдается резкий спад в области температур размораживания сегментальной подвижности хитозана (246 • C). Рост модуля упругости до 100 • C и перегибы в этой области температур связан с потерей сорбированной влаги[29].Кривые tg δ (рис. 7) характеризуются широкими максимумами при температурах 250−300 • C, которые определяют температуру стеклования T g композитов.…”

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“…Однако термическое разрушение хитозана наблюдается в том же диапазоне температур. Согласно литературным данным[29], T g хитозана близка к температуре его термодеструкции. Температура начала термодекструкции находится (как показано выше) в диапазоне 270−280 • C для всех исследуемых образцов.…”

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Влияние Углеродных Нанотрубок На Электрические И Механические Свойства Хитозановых Пленок

Камалов¹,

Kодолова-Чухонцева²,

Дресвянина³

et al. 2022

Журнал Технической Физики

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Using the methods of X-ray diffraction and scanning electron microscopy, the structure of composite films based on chitosan and single-wall carbon tubes has been studied. It is shown that the introduction of carbon nanotubes leads to the ordering of the chitosan structure. Increase in concentration of nanotubes (from 0 to 3%) causes rise in the value of storage modulus from 3 to 4 GPa (DMA data), increase in electrical conductivity of samples (from 10-11 to 102 S/m), and some changes in their dielectric permittivity (from 5.5. to 26 at an electrical field frequency of 1kHz). Data on the ionic and electronic components of the conductivity of the composite film are presented.

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Thermal Properties of Salt and Base Forms of Chitosan

Cited by 16 publications

References 13 publications

Thermal Properties and Structural Features of Multilayer Films Based on Chitosan and Anionic Polysaccharides

Thermal Properties and Structural Features of Multilayer Films Based on Chitosan and Anionic Polysaccharides

Effect of Chitin Nanofibrils on Biocompatibility and Bioactivity of the Chitosan-Based Composite Film Matrix Intended for Tissue Engineering

Влияние Углеродных Нанотрубок На Электрические И Механические Свойства Хитозановых Пленок

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