Composites and nanocomposites
Ali Yakoub Alkhair; Emiru Yidnekachew Melesse; Irina Anatol'evna Kirsh; Yulia Aleksandrovna Filinskaya; Izabella Sergeevna Tveritnikova; Oleg Igorevich Mihryachev
Abstract
Bio-composite from linear low-density polyethylene (LLDPE) with lysozyme, mixed lysosome and glucose oxidase enzymes was synthesized through the melt extrusion system, respectively. The aim of this work was evaluation and characterization of the effect of lysosome, mixed lysosome and glucose oxidase ...
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Bio-composite from linear low-density polyethylene (LLDPE) with lysozyme, mixed lysosome and glucose oxidase enzymes was synthesized through the melt extrusion system, respectively. The aim of this work was evaluation and characterization of the effect of lysosome, mixed lysosome and glucose oxidase enzymes on the mechanical, water vapor transfer rate, and structural appearance of the Bio based LLDPE composite films. Along this line, 50 g of LLDPE pellets incorporated with 1%, 5%, and 10% (w/w) of lysozyme alone, mixed lysosome and glucose oxidase were examined, apparently. Pure LLDPE was used as a control. Over all, biocomposite with 5 and 10%(w/w) of mixed lysosome and glucose oxidase enzymes did not result in good outcome and not even enough for characterization. The surface structure of biocomposites was examined through the digital microscopy for identify dispersion of enzymes inside the LLDPE matrix and at higher concentration (10w/w%) dense and large surface are formed. However, good dispersion and reinforcing activity of enzymes in the LLDPE matrix was noticed with small concentration of lysosome (1, and 5w/w%) enzymes. The mechanical strength and elongation at break of biocomposite composite films were found to increase with small concentration (1 and 5 w/w%), but decrease with increasing of enzyme concentration. Averagely, the WVTR showed increase as the enzyme concentration increased. Besides, the Fourier-transform infrared spectroscopy (FTIR) was used to determine structural configuration of the enzymes in LDPE matrix; single sharp stretching breaks at 570 cm-1 with 1, 5 and 10 wt.% was corresponded to the existence of enzyme bands. All in one, the addition of lysozomes and glucose oxidase in small concentration has high potential in development of biocomposite relative to the traditional plastic composites.
Characterization
Ivan Kuryndin; Sergei Kostromin; Rustam Mamalimov; Anton Chervov; Andrei Grebennikov; Sergei Bronnikov
Abstract
Swelling of high-density polyethylene (PE) in organic solvents, orthodichlorobenzene and orthoxylene, was investigated. The swelling kinetics of the PE specimen was described by the first-order equation. For the first time, the PE specimen swelling rate constant was shown to decrease with increasing ...
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Swelling of high-density polyethylene (PE) in organic solvents, orthodichlorobenzene and orthoxylene, was investigated. The swelling kinetics of the PE specimen was described by the first-order equation. For the first time, the PE specimen swelling rate constant was shown to decrease with increasing thickness of the specimens. The equilibrium swelling of the PE specimen was evaluated. It was found that equilibrium swelling is independent of the thickness of specimens. It was shown that storage of polyethylene specimens in organic solvents changes its mechanical properties (tensile strength, Young’s modulus, and elongation-at-break) due to polymer plasticization. We have shown that the increase in flexibility and elongation-at-break after relatively short-term immersion of PE samples in these organic solvents is significant. However, the tensile strength of swollen specimens remains high enough. The interaction between polymer chains and solvent molecules was not detected. The results obtained are important for the design and operation of PE coatings and PE products, such as pipes, tanks, and other accessories exposed to oil products.
