Polystirene nanocomposites with titanate nanotubes and titanate nanoribbons were prepared by an extrusion process at 180oC. NMR analysis at and above the glass transition temperature Tg=373 K suggest that nanofillers affect the termodynamic properties of nanocomposite domains. At the same time, only a slight increase in mechanical tensile properties was observed, reflecting a weak interaction between the polymer matrix and the nanofiller. Nevertheless, the use of functionalizes TiNRS may be a very promising starting point for the preparation of nanocomposites at the industrial level.
COBISS.SI-ID: 22051623
The structural and mechanical characteristics of polymeric biocomposites based on calcium lactate (CL) and either partially or fully hydrolyzed PVA were studied using optical microscopy, Fourier transform IR spectroscopy, and DSC, and in addition, the moisture absorption effect on their mechanical properties. The samples conditioned at 50%RH showed decrease in E modulus and tensile strength in comparison with the material stored below 20%RH. Nevertheless, the enhancement of tensile properties, due to the addition of CL, was noticeable especially for the partially hydrolyzed PVA biocomposites.
COBISS.SI-ID: 10998043
This is the second paper in the series addressing the constitutive modeling of dynamically loaded elastomeric products such as power transmission belts. When the time-dependent properties of the elastomeric material “match” the time-scale of the dynamic loading a strain accumulation process occurs. It was shown that the location of a critical angular velocity, where the strain accumulation is the most intensive, strongly depends on the distribution of the retardation spectrum, whereas the magnitude of the accumulated strain is governed by the strength of the corresponding spectrum lines.
COBISS.SI-ID: 11241243
The work discusses new possibilities of modifying the functionality of polymer products by changing their material structure during processing and consequently the time-dependent properties which define the durability of the final product. By analysing the low density polyethylene extrudates produced with a laboratory extruder, we observed that changing the processing conditions improves the durability of extrudates by several orders of magnitude. This opens new possibilities in the field of modifying the functionality of polymer products, and hence, better competitiveness on the world market.
COBISS.SI-ID: 11292955
This paper presents theoretical approach for predicting durability of periodically loaded polymeric products. Methodology includes numerical calculations of accumulated strain as a function of the number of loading cycles and function of loading frequency. Based on these calculations we can determine the critical frequency area of periodic loading where the strain accumulation is the most intensive, and may lead to material failure of cyclically loaded product.
COBISS.SI-ID: 11119899