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    Evaluation of Properties of Polypropylene Matrix Composites Reinforced With Perlite, Expanded Perlite, Silanized Expanded Perlite, and Talc Fillers
    (Wiley, 2025) Yesilyurt, Aysenur; Uysal, Naci
    Improving the mechanical and thermal performance of polypropylene (PP) composites is essential to meet the demanding requirements of contemporary automotive, construction, and electrical-engineering applications. To address this, PP matrix composites were developed using natural and environmentally friendly fillers such as speech, perlite, expanded perlite, and silanized expanded perlite, and their physical, mechanical, morphological, and thermal properties were investigated. Composites were prepared using a twin-screw extruder with 5%, 10%, and 20% (w/w) fillers, and additives were used as PP reference samples. The samples were evaluated through density measurements, FTIR spectroscopy, color analysis, melt flow index, tensile and flexural strength testing, impact resistance, scanning electron microscopy, thermogravimetric analysis, and heat deflection temperature (HDT) testing. The results showed significant changes in the properties of the filler material used and structural composites. Thermal properties of hybrid composites showed improvement compared to neat PP for all types and ratios. The HDT values of the composites are similar to each other and to that of pure PP. The flexural strength and tensile strength values of neat PP are 22.1 and 16.2 MPa, while the flexural and tensile values for all ratios of four different inorganic additives resulted in higher values. The flexural strength of PP-P20 (20% perlite additive) composite is increased by 43%, and the tensile strength increased by 29% compared to pure PP. As expected, the values of the composites were higher compared to pure PP. The melt flow index values decreased for the additives, except for the perlite additive. The index of the additive ratios used belongs to the higher values compared to PP. The innovations obtained show that these additive ratios are effective in the development of PP matrix composites in high-performance range applications as low selection and environmentally friendly options.
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    Mechanical, Thermal, and Sound Properties of Bamboo-Powder-Filled Polyurethane Composites
    (Wiley-V C H Verlag Gmbh, 2024) Yesilyurt, Aysenur; Parin, Fatma Nur; Uysal, Naci
    Bamboo, which is called green gold because of its sustainability characteristics, has many wonderful properties that make it environmentally friendly. In this study, polyurethane (PU) composites used in the automotive industry were produced by adding different amounts of bamboo powders (1, 2.5, 5, 7.5, 10 and 15%, w/v) to PU foams. In this regard, density, light and stereomicroscopic analysis, thermal conductivity, spectroscopic analysis, and mechanical (compression) test have been performed. Further, sound absorption analysis and contact angle analysis have been carried out. Optical and stereomicroscopes showed average pore sizes with range of 258-482 mu m. As the bamboo powder increased, the contact angle values decreased from 129 degrees to 88 degrees. Compression force deflection values of the samples declined from 1850 to 360 g/cm2. Similar to the mechanical properties, the thermal conductivities of the PU foams decreased. However, in regards to FT-IR, no chemical reactions were observed between PU matrix and bamboo powder. The sound absorption test results showed that bamboo powder filled PU foams are sound absorption materials and that rigid PU foam with 2.5% (w/v) (PU-2.5) bamboo powder sample had better sound absorption properties than the bamboo-powder-unfilled rigid PU foam (PU-0), with an average sound absorption coefficient value of 0.86 at 6300 Hz and 0.71 in the range of 1600-6300 Hz. Bamboo powder, called green gold, has been used in the production of polyurethane foams that are used in many sectors. Thermal conductivity, sound absorption, mechanical strength, wettability, pore size, and sponge apparent density properties of polyurethane foams were examined depending on the proportions of bamboo powder. In line with the data obtained, it has been observed that bamboo#x02010;powder#x02010;filled polyurethane foams can be used as sound insulation materials and thermal insulation materials. image