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The plasticizing effect of properties of manganous chloride and glycerin on poly(vinyl alcohol)

100%
Jia P., Zhang M., Bo C., Hu L., Zhou Y.
Polish Journal of Chemical Technology
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2015
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vol. 17
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issue 2
29-33
EN
Poly(vinyl alcohol) films were prepared with manganous chloride (MnCl2 · 4H2O) and glycerin as complex plasticizer. The micro morphology of pure PVA film and complex plasticizer plasticized PVA films was observed by scanning electron microscope (SEM). The interaction between complex plasticizer and PVA molecules was investigated by Fourier transform infrared spectroscopy (FT-IR). The influence of complex plasticizer on crystalline, thermal and mechanical properties of PVA films was studied by X-ray diffraction (XRD), differential scanning calorimetry (DSC), thermogravimetric analysis (TG), and tensile testing, respectively. The results showed that the complex plasticizer of MnCl2 · 4H2O/glycerin could interacted with PVA molecular and then effectively destroy the crystals of PVA. PVA films plasticized with complex plasticizer of MnCl2 · 4H2O/glycerin became soft and ductile, with lower tensile strength and higher elongation at break compared with PVA films. This is an important cause of plasticization of the complex plasticizer of MnCl2 · 4H2O/glycerin on PVA films.
2
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POLYMER BIOCOMPOSITES USED IN BEDSORES TREATMENT

100%
Wiśniewska-Wrona M., Kucharska M., Kardas I., Bodek A., Bodek H.
Progress on Chemistry and Application of Chitin and its Derivatives
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2011
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vol. 16
111 - 120
EN
Investigations are presented in the preparation of composite dressing material based on two biopolymers -chitosan and sodium alginate with the addition of sulfanilamide as medication designed for the healing of bedsores. The dressing was prepared in the form of film. The biopolymers used in the construction of the film make the dressing biodegradable and resorbable in the wound’s environment. Mechanical properties of the film were tested: thickness, extension strength, tenacity and elongation at maximum stress The ability of the material to match the wound was examined, too, as well as the transmission of water vapor. Sulfanilamide as bacteriostatic agent was added to the prepared composites. Mechanical and sorption properties of the composite dressings with addition of the active substance depend largely on their composition. The sorption properties were tested before and after addition of the medication .The release of the medication is intricate and proceeds according to kinetics of first order. Susceptibility of the composite materials to hydrolytic and enzymatic degradation was assessed.
3
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In the Old Cinema. Stefan Grabiński and Expressionism

86%
Majewska J., Majewska J.
Nauka
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2020
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issue 4
4
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Physico-chemical properties of Chitosan films

86%
Balau L., Lisa G., Popa M., Tura V., Melnig V.
Open Chemistry
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2004
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vol. 2
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issue 4
638-647
EN
Chitosan films obtained by dry phase inversion were prepared from an aqueous solution of chitosan in acetic acid. The films, of thickness less than 20 μm, were transparent, very flexible and had smooth surfaces. Increasing the film thickness induced an increase of the internal tensions and the consequent formation of a rough surface. Structural investigations by X-ray diffraction and Fourier transform IR analysis, showed that the chitosan films, as prepared, are amorphous. Further annealing to evaporate acetic acid and water traces, changed the amorphous phase into a more ordered phase, characterized by diffraction peaks at 2θ values of 9, 17, 20 and 23 degrees. Thermal investigations by TG, DTG, and DTA revealed that the decomposition of the chitosan films as prepared proceeds in two stages, starting from 180°C and 540°C.
5
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Synthesis, Properties and Applications of some Magnetic Oxide Based Nanoparticles and Films

72%
Belous A., Tovstolytkin A., Solopan S., Shlapa Y., Fedorchuk O.
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2018
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vol. 133
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issue 4
1006-1012
EN
The work highlights peculiar features of synthesis and summarizes important properties of nanoparticles and films based on two types of oxide magnets: with spinel and perovskite-type structures. The attention is drawn to the differences in the processes underlying the formation of crystalline phase in the materials of each group. It is shown that for the spinels, the formation of weakly agglomerated crystalline nanoparticles can occur in the process of synthesis, but for the perovskite-like magnets, the formation of crystalline nanoparticles requires additional high-temperature treatment. It is demonstrated that synthesized nanoparticles and films may find wide practical applications, particularly as the heat mediators in hyperthermia treatment therapy, as components of left-handed media, ferroelectric-ferromagnetic layered structures and composite microwave resonators. They also may be used as integral parts of composite structures, which possess magnetic-field-controlled properties and display giant magnetocaloric effect.
6
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Microplastic Abundance in Sediment in Pangandaran Waters, West Java, Indonesia

72%
Yuliadi L. P. S., Nurruhwati I., Astuty S.
World News of Natural Sciences
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2023
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vol. 51
10-22
EN
Rapid development in the tourism sector of Pangandaraan raises various problems such as environmental degradation, environmental pollution and waste problems. Microplastic pollution in the oceans is a type of hazardous waste, with microscopic plastic particles less than 5 mm in size. Generally, easy-to-find microplastics include fragments, films, and fibers. Microplastic abundances are found in deep sea areas similar to those in the intertidal area. The purpose of this research is to know the microplastic composition which is sedimentation in various types of sediments and the factors that influence the changes to the microplastic sedimentation in the Pangandaran waters. This research uses the survey method. The most common microplastic particles in station 2 were 12.622 particles (fibers and fragments) and the lowest was found in station 4 of 1.809 particles (fiber, fragment and film). The highest number of microplastic particles trapped in mesh size sediment between 106 µm – 250 µm. Current, waves and tides are factors that cause microplastic movement in the sea. The distribution of microplastic particles is influenced by oceanography factor, density, shape and size of microplastic.
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