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https://hdl.handle.net/20.500.13091/6044
Title: | Effect of various aging conditions and treatment methods on thermal degradation of coffee waste/epoxy composites | Authors: | Işık, Murat Özmeral, Nimet Ahmetli, Gülnare Kalem, Merve Soğancıoğlu |
Keywords: | Aging properties Coffee waste Composite Epoxy Thermal stability Epoxy-Resin Polypropylene Composites Environmental-Conditions Mechanical-Properties Uv Degradation Fiber Surface Water Performances Ultrasound Diffusion |
Publisher: | Elsevier | Abstract: | In composites containing lignocellulosic fillers, the chemical composition of the filler mostly determines the heat resistance. Based on the rules of green chemistry, new bio-based composites were developed from the waste of industrial crop product coffee (CW), and their thermal stability in different aging environments was examined by thermogravimetric analysis (TGA). Alkali (NaOH), microwave (MW), ultrasound (US), and alkali pretreatment followed by microwave (NaOH+MW) were applied to modify the CW. The effect of various applied treatment methods and environmental conditions such as UV radiation, water sorption, seawater, and hydrothermally agings on the thermal properties of the composites was investigated. Fourier-transform infrared spectroscopy (FTIR) and Field emission scanning electron microscopy (FE-SEM) were used in the characterization of composites. Among the environmental factors tested, seawater and hydrothermal aging affected the thermal resistance of the composites the most, while NaOH+MW affected it most among the processing methods. Although the thermal stability of unaged and UV-exposed MW-CW composites was found to be the highest, it was more affected by aging in seawater, pure water, and hydrothermal environments. As a result, MW was found to be more effective among the treatment methods in terms of thermal properties under UV conditions, confirming that the adoption of environmentally friendly methods and surface modification of the filler can provide superior composites. | URI: | https://doi.org/10.1016/j.indcrop.2024.119115 https://hdl.handle.net/20.500.13091/6044 |
ISSN: | 0926-6690 1872-633X |
Appears in Collections: | Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collections WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collections |
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