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    EFFECTS OF OV-POSS NANOPARTICLES ON THE VULCANIZATION KINETICS OF NATURAL RUBBER COMPOUNDS
    (Institute of Metals Technology, 2021) Üçtepe, E.; Yaz?c?, N.; Kodal, M.; Karaa?aç, B.; Özkoç, G.
    Polyhedral oligomeric silsesquioxanes (POSSs) are new-generation additives, which can provide improved properties of polymer matrices due to physical and/or chemical interactions between the polymer molecules and their reactive sites. In the case ofrubber-based polymeric systems, POSSs are also able to accompany a vulcanization reaction. This study aimed to investigatethe effect of octavinyl functionalized POSS (OV-POSS) on the sulphur vulcanization of a model natural rubber (NR) based compound.The reaction kinetics was studied using various kinetic approaches based on moving die rheometry and differential scanningcalorimetry. Rheometric data was evaluated using a common non-linear cure kinetic model, called the Isayev and DengModel. The Kissinger, Flynn-Wall-Ozawa and Crane Models were used to evaluate the thermal data for curing reactions. All themodels were found to be able to analyze the vulcanization kinetics of OV-POSS containing NR-based rubber compounds as wellas the effect of the OV-POSS incorporation © 2021. Materiali in Tehnologije. All Rights Reserved.
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    A NOVEL APPROACH TO IMPROVE THE PERFORMANCE OF TPV via SELF-NANO REINFORCED NETWORK STRUCTURE
    (Society of Plastics Engineers, 2023) Yazici, N.; Kodal, M.; Ozkoc, G.
    Thermoplastic vulcanizates (TPVs) are high-performance polymeric materials classified as thermoplastic elastomers, and contain a continuous thermoplastic matrix with crosslinked elastomers as a dispersed phase. TPVs combine the high elasticity of crosslinked elastomers and the easy processability and recyclability of thermoplastics. The most widely produced TPV type is polypropylene (PP)/ethylene propylene diene monomer (EPDM), which is the focus of this study. In this study, polyhedral oligomeric silsesquioxane nanoparticles containing reactive side groups were used as coagents for PP/EPDM TPV system for the first time in the literature. The peroxide crosslinked PP/EPDM/POSS system was dynamically vulcanized in a lab-scale micro-compounder. The mechanical properties of samples were determined by tensile, hardness, and compression set analyses. Scanning electron microscope (SEM) and atomic force microscope (AFM) were used to evaluate the phase morphology. The results showed that nano-reinforced network structure improved the performance of the TPV materials. © 2023 Society of Plastics Engineers. All rights reserved.