Effect of highly dispersed silica on water absorption of gelatin materials

Stavinskaya, Oksana; Лагута, И. В.; Kuzema, P. O.

doi:10.1134/s2070205111030154

Cited by 12 publications

(12 citation statements)

References 14 publications

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“…2, the peak at stage I is asymmetric and may be split into two components. In accordance with the literature data [2,17] and with our previous results [16], these two components can be attributed to two different types of water, namely the so-called free and bound water (water 1 and water 2, respectively). Indeed, according to NMR studies [3], gelatin gels contain three types of water, i.e., free water, water bound with gelatin macromolecules in a helical conformation and exposed to the free solvent and structural water consisting of molecules that are bound with gelatin chains and stabilize the triple helix or aggregates of triple helices.…”

Section: Resultssupporting

confidence: 82%

“…1 and 2, the process of mass loss of gelatin films under heating can be tentatively divided into several stages, i.e., at temperatures up to -200, 200-470 and above 470°C. According to our previous data [16], the water was the only product registered in TPD mass spectra of gelatin films heated up to 200°C. Thus, the temperature range up to 200°C (stage I) corresponds to the release of water in the absence of the thermal degradation of the polymer, and it is the subject of this work.…”

Section: Quantum Chemical Calculationsmentioning

confidence: 99%

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Thermogravimetric study of water affinity of gelatin materials

Kuzema

Stavinskaya

Лагута

et al. 2015

J Therm Anal Calorim

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Gelatin materials in the form of thin films were prepared using film-forming gelatin solutions with pH value of 2.5-6.8; interaction of gelatin with water in the films and in the solutions was studied. Thermogravimetric analysis at temperature up to 200°C was used to identify and characterize free and bound water present in dried films. To simulate the water-gelatin interaction and to interpret thermogravimetric data, quantum chemical calculations along with the studies on the films swelling were performed. For both free water and bound water, the parameters of thermal desorption process were found to be affected by pH of film-forming solution. The observed changes in content of free and bound water and in apparent activation energies of water thermal desorption may be attributed to the growth of the quantity of negatively charged groups in gelatin molecules upon pH increase and to the changes in film structure and water affinity resulting from the charged groups interaction. Thus, by varying pH of the solution, one may influence the affinity of the films with respect to water and change the properties and usability of gelatin materials.

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Section: Resultssupporting

confidence: 82%

Section: Quantum Chemical Calculationsmentioning

confidence: 99%

Thermogravimetric study of water affinity of gelatin materials

Kuzema

Stavinskaya

Лагута

et al. 2015

J Therm Anal Calorim

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“…It appears that this effect may be related both to the hydrophilic nature of the gelatine proteins and less compact structure of the Compared to their air-dried counterparts, the systems that undergo a solvent extraction process are significantly less hydrophilic nature of the surface while increasing the sorption capacity with respect to water. This may be caused by the preservation of the original structure of the wet gel that does not shrink or collapse under capillary forces accompanying evaporative drying of the gel [18,19].…”

Section: Resultsmentioning

confidence: 99%

“…The water absorption of the biopolymers composites is an important parameter in view of their use as a support matrix for controlled release system of drugs or plant nutrients [18,19].…”

Section: Resultsmentioning

confidence: 99%

NEW METHOD OF OBTAINING GELATINE-SiO₂ COMPOSITE SYSTEMS USING 3-GLYCIDOXYPROPYLTRIMETHOXYSILANE AND 3-CHLOROPROPYLTRIMETHOXYSILANE

Martyła¹

2017

Ceramics - Silikaty

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Composite materials based on biopolymers are an attractive alternative to conventional composites because of their high biocompatibility, biodegradability and unique functional characteristics. The method developed for the synthesis of material using glycidoxypropyltrimethoxysilane and chloropropyltrimethoxysilane is based on sol-gel processes making possible enhanced control over the final properties of the composite, such as water absorption and the hydrophobic or hydrophilicproperties. Thermal studies of the composite show significant complexity of the formation process of the composite, and the possibility of the controlled carbonization into ceramic material.

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“…Previously we have shown [5] that fumed silica may be used as a cross-linker owing to high concentration of surface ≡SiO¯¯ and ≡SiOН groups capable to interact electrostatically with positively charged parts of gelatin molecules and to form hydrogen bonds with carboxyl and amino groups of the polymer. The properties of such silicagelatin materials will depend on the quantity of silica embedded and on the nature of its surface.…”

Section: Introductionmentioning

confidence: 99%