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Comparison of Antibacterial Properties of Nano TiO_2 and ZnO Particle Filled Polymers

100%

Altan M., Yildirim H.

vol. 125

issue 2

645-647

Antibacterial property for the plastic products is very important due to their wide spread usage in many areas close to human health such as a child toy or a food package. There are some methods to make polymers antibacterial such as ionizing radiation but they can be still infected by micro organisms during usage of them. The best and easy way to obtain antibacterial polymers is melt mixing of polymers with antibacterial agents. In this study, nano TiO_2 and ZnO particles were mixed with polypropylene and high density polyethylene with a twin screw extruder. Silane was applied to the particles prior melt mixing in order to prevent agglomeration and FT-IR analysis was done to characterize the particles. After melt mixing, particle filled rectangular plates were obtained by plastic injection molding and antibacterial tests were done on the plates according to a standard method, JIS Z 2801. According to the results, satisfactory antibacterial properties were obtained for both polymers and it has been seen that particles without silane could not provide antibacterial effect.

The Effect of Surface Polishing on the Flexural Strength of Anorthite-based Porcelainised Stoneware

81%

Yildirim H., Azakli Y., Tarakci M., Capoglu A.

Acta Physica Polonica A

2015

vol. 127

issue 4

1336-1341

The effect of surface polishing on the flexural strength of anorthite based porcelainised stoneware was studied. The flexural strength results obtained from both polished and unpolished samples were analysed by using Weibull statistical method. The state of surfaces and microstructures of polished and unpolished samples were also characterised by profilometry and scanning electron microscopy. Typical flexural strength value obtained from anorthite based stoneware body fired at 1210°C was about 100 MPa. The average flexural strength (σ_{m}) and Weibull modulus (m) values for as fired, ground, and ground and polished specimens increased sequentially with polishing degree. The surface roughness measurements and microstructure observations showed that the severity of the surface flaws declined as the polishing process proceeded. The obtainment of better strength behaviour with polishing was attributed to high crystalline to glassy phase ratio of the anorthite based porcelainised stoneware together with the formation of network structure of these anorthite crystals.

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2 Acta Physica Polonica A

1 2015

1 2014

2 Yildirim H.

1 Altan M.

1 Azakli Y.

1 Capoglu A.

1 Tarakci M.

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Comparison of Antibacterial Properties of Nano TiO_2 and ZnO Particle Filled Polymers

The Effect of Surface Polishing on the Flexural Strength of Anorthite-based Porcelainised Stoneware