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1
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Taguchi Approach to Tribological Behaviour of Chopped Carbon Fiber-Reinforced Epoxy Composite Materials

100%
Ozsoy N., Ozsoy M., Mimaroglu A.
Acta Physica Polonica A
|
2017
|
vol. 132
|
issue 3
846-848
EN
Chopped carbon fiber-reinforced epoxy composites were fabricated and tested for tribological behaviour. Wear behaviour of composites was studied using pin-on-disc wear tester device. The design of experiment, using Taguchi method, was employed to analyse the results. Signal to noise ratio and analysis of variance (ANOVA) were used to determine the influence of parameters on the wear rate and coefficient of friction.
2
Content available remote

Characterization of UHWPE-TiO₂ Composites Produced by Gelation/Crystallization Method

100%
Celebi Efe G., Bindal C., Ucisik A.
Acta Physica Polonica A
|
2017
|
vol. 132
|
issue 3
767-769
EN
In this study, ultra-high molecular weight polyethylene (UHMWPE) - TiO₂ composites reinforced with TiO₂ particles with weight ratios of 0.5, 1 and 2% were produced by gelation/crystallization method in decalin+antioxidant solution of UHMWPE at 150°C, for 40 min by using magnetic stirrer. The gel mixture was cooled in an aluminum tray embedded in iced water under ambient conditions and dried in an oven at 130°C for 90 min to remove any residual trace of decalin. Distribution and elemental analyses of TiO₂ particles in polymer matrix was examined by SEM-EDS. Crystallization behavior was investigated by differential scanning calorimetry (DSC). Based on the results, TiO₂ particles in the UHMWPE have accelerated the crystallization, acting as nucleating agents, with increment from 56% for UHMWPE to 63.5% for UHMWPE-2 wt% TiO₂. The present bond types in composites were analyzed by Raman spectroscopy and the results are in good agreement with literature. Uniaxial tensile tests were performed to determine Young's modulus of UHMWPE-TiO₂ composites. It was found that Young's modulus of UHMWPE was increased from 52 MPa to 800 MPa with the addition of TiO₂ particles.
3
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A Study of the Properties of Paper Sized with Styrene-Butyl Acrylate Copolymers

76%
Özdemır M., Özdemır Alp M., Aytaç A., Denız V.
Acta Physica Polonica A
|
2017
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vol. 132
|
issue 3
1098-1101
EN
In this study, styrene 70 wt.%-butyl acrylate 30 wt.% copolymer-based surface-sizing materials were synthesized using semi-batch emulsion polymerization and applied on the paper. Four different emulsifiers, with different ethylene oxide numbers, at ratios of 10%, 7% and (2, 2'-azobis (2-methylpropionamidine) dihydrochloride (A)) as initiator were used for emulsion polymerization. Eight different copolymers were synthesized. Synthesized copolymers were used as surface sizing agents for the paper surface. Ion exchange capacity, pH, Fourier transform infrared spectroscopy, differential scanning calorimetry and thermal gravimetric analysis were used for the characterization of the copolymer properties. Contact angle measurements, Cobb test, and scanning electron microscopy analysis were carried out to determine the surface properties of the paper samples. Presence of copolymer formations was proven with the Fourier transform infrared analysis. Contact angle measurements of the copolymer sized paper surface have shown hydrophobic behaviour in samples, with the exception of E-3/7/A sample. The lowest Cobb value was observed for E-2/7/A sample. The highest thermal stability was also observed for E-2/7/A sample. The scanning electron micrographs show that the paper loses its fibrous structure and it is seen that the copolymer adheres to the fibrous tissue.
4
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Carbon Black Loaded Composite Poly(Dimethyl Siloxane) Membrane Preparation and Application for Hazardous Chemical Removal from Water

64%
Nigiz F., Unlu D., Hilmioglu N.
Acta Physica Polonica A
|
2017
|
vol. 132
|
issue 3
693-696
EN
Industrial waste-water contains hundreds of hazardous chemical components such as volatile organic compounds. Several of the chemicals, such as acetone, are soluble in water. These chemicals pose a threat to the human health and ecosystem. The governments are interested in decreasing the concentration of these chemicals in waste-water by making environmental regulations. Most of the chemical industries have their own waste-water treatment units. These units can separate impurities down to ppm level. After that point, more complicated and costly methods are required. Alternatively, membrane separation methods, such as pervaporation can be used for selective separations of the volatile organic compounds. Pervaporative separation system is defined as environmentally friendly, cost effective process to separate azeotropic and water soluble mixtures. The membrane is the main constituent of the pervaporation and the performance of the separation is directly affected by the membrane selection. In this study, carbon black loaded poly(dimethyl siloxane) mixed matrix membrane was prepared to separate acetone from water by pervaporation. Thermal gravimetric analysis was applied to determine the thermal behavior of the membrane. Inorganic distribution was monitored by means of polarized electron microscopy. Contact angle measurement was applied to determine the effect of filler incorporation on the polymer hydrophobicity. Effect of temperature and feed molar ratio on acetone selectivity and flux were determined.
5
Content available remote

Mechanical and Tribological Behaviour of Chopped E-Glass Fiber-Reinforced Epoxy Composite Materials

64%
Ozsoy N., Ozsoy M., Mimaroglu A.
Acta Physica Polonica A
|
2017
|
vol. 132
|
issue 3
852-856
EN
Chopped E-glass fiber-reinforced epoxy composites (10%, 30% and 50%) were fabricated and their mechanical and tribological behaviour was investigated. Three-point bending tests were performed according to the ASTMD790 and tensile tests were performed according to the ASTMD638 standards. Impact tests and hardness measurements of the composites were also carried out. Wear behaviour of composites was studied using pin on disc wear testing device. The design of experiments approach, using Taguchi method, was employed to analyze the results. Signal-to-noise ratio and analysis of variance were used to determine the influence of parameters on the wear rate and coefficient of friction.
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