An unprecedented synthesis of terpolymers from bioderived monomers and elemental sulfur in one-pot is described. In this approach, biosourced compounds, namely, vanilin and furfurylamine-based benzoxazine and ionones (and carvone), and a waste product of petroleum industry, sulfur, were reacted in one pot to produce an advanced thermoset. The inverse vulcanization of these compounds was monitored, and the properties of the obtained terpolymers were characterized via spectral and thermal characterization methods. Moreover, a potential use of the polymers as a Li−S battery cathode was demonstrated, and over 400 mAh/g capacity more than 100 of cycles were observed. Electrochemical impedance spectroscopy studies were used to gain more insight into the lithium storage mechanism before and after cycling.
In the study, the changes in the mechanical properties of the natural stone samples, which had been obtained from different regions of Turkey, before and after the freeze-thaw test were examined. Within the scope of the study, 17 different natural stone samples were used and, after chemical and mineralogical-petrographical properties were determined. Water absorption at atmospheric pressure, real density, porosity, and uniaxial compressive strength tests were performed before and after freezing-thawing. The freezing and thawing test has been performed using TS EN 12371 standard from -12 °C to +20 °C in 56 cycles (2 cycles = 24 hours). After the test, the samples were subjected to uniaxial compressive strength test in order to identify the changes of the compressive strength values. The results of the physical and mechanical tests on these samples were evaluated by grouping according to chemical and mineralogical-petrographical properties of natural stones. It was aimed to determine which natural stone samples are resistant to freeze-thaw, and can be used in external cladding applications according to the findings obtained from the study. Citation info: Erol, G., Bayram, O. 2020. A laboratory-scale investigation on freezing-thawing behavior of some natural stone samples manifactured in Turkey. Bulletin of the Mineral Research and Exploration 163, 131-139.
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