Мікрокристалічна целюлоза і композити на її основі: структура та можливості застосування
Abstract
MICROCRYSTALLINE CELLULOSE AND CELLULOSE-BASED COMPOSITES: STRUCTURE AND POSSIBILITIES OF APPLICATION
V. Boyko, V. Chornii, V. Barbash, O. Yashchenko, A. Alekseev, Yu. Hrabovskyi, S. Nedilko, E. Reznichenko, V. Shcherbatskyi, M. Nedielko
Cellulose, as one of the most common on Earth natural polymers, is widely used for the production of functional, and among them, nanosized composite photovoltaic materials and devices based on them. In particular, it can be sensors, drives, devices for flexible electronics, etc.
Cellulose has a number of special properties that are important not only for the manufacture of its products for practical use, but also for the study of physical and chemical processes in the condensed matter. Among such features of materials based on cellulose is, for example, its ability to form a liquid crystal structure in concentrated aqueous solutions.
The purpose of the study is to develop and clarify the structural characteristics of nanostructured composites based on cellulose, as matrix, and some complex oxides as fillers.
The data on preparation, structure and morphology of microcrystalline cellulose and cellulose-based composites, those have oxide component as filler are reported. It is shown that depending on raw materials origin and processing degree cellulose samples reveal various degree of crystallinity (in the range 64 – 77 %). Obtained composites reveal even lesser crystallinity degree ≈ 57%. Detailed analysis of surface morphology was performed with using of scanning electronic microscopy. It was found the studied samples contains plates with sizes ~ 20 – 50 μ those consist of close-packed grains of 5-10 μ size. In the case of composites some oxide nanoparticles (sizes up to 200 nm) were incorporated into grains of microcrystalline cellulose. It was shown that action of light on “cellulose”+”AgNO3” composite led to reduction of silver. This observation indicates a possibility for using of such composites as bactericide materials.
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