Malicka Aneta, Rułka Kamila, Latos-Brozio Malgorzata, Masek Anna
Institute of Polymer and Dye Technology, Faculty of Chemistry, Lodz University of Technology, Stefanowskiego 16, 90-537 Lodz, Poland.
Materials (Basel). 2024 Aug 22;17(16):4160. doi: 10.3390/ma17164160.
The development of eco-friendly elastomeric materials has become an important issue in recent years. In this work, thermoplastic elastomer samples of an ethylene-norbornene copolymer (EN) with coffee and tea biofillers mixed with typical fillers such as montmorillonite (MMT), silica (SiO), and cellulose were investigated. The aim of this research was to determine the effect of fillers on the properties of the materials and to assess their degradability after two ultraviolet (UV) aging cycles (200, 400 h). The scientific novelty of this work is the assessment of the anti-aging effect of simultaneous biofillers-stabilizers based on coffee and tea waste. The surfaces of the obtained polymer compositions were examined using infrared spectroscopy (FTIR-ATR). Contact angles were determined, and surface energy was calculated. The mechanical properties were tested, and the influence of plant fillers and aging on the color change in the materials was analyzed. The combination of coffee with silica, MMT, and cellulose fillers limited the migration of fatty acids and other compounds from the biofiller to the EN surface (FTIR analysis). Based on the aging coefficients K, it was shown that all coffee- and tea-based fillers stabilized the polymer compositions during UV aging (400 h). The results allowed the authors to determine the importance and impact of waste plant fillers on the degradability of the synthetic EN.
近年来，环保型弹性体材料的开发已成为一个重要问题。在这项工作中，研究了乙烯-降冰片烯共聚物（EN）与咖啡和茶生物填料混合典型填料（如蒙脱石（MMT）、二氧化硅（SiO）和纤维素）的热塑性弹性体样品。本研究的目的是确定填料对材料性能的影响，并评估其在两个紫外线（UV）老化循环（200、400小时）后的降解性。这项工作的科学新颖之处在于评估基于咖啡和茶废料的生物填料-稳定剂的抗老化效果。使用红外光谱（FTIR-ATR）对所得聚合物组合物的表面进行了检查。测定了接触角，并计算了表面能。测试了力学性能，并分析了植物填料和老化对材料颜色变化的影响。咖啡与二氧化硅、MMT和纤维素填料的组合限制了脂肪酸和其他化合物从生物填料向EN表面的迁移（FTIR分析）。基于老化系数K，结果表明，所有基于咖啡和茶的填料在UV老化（400小时）期间稳定了聚合物组合物。这些结果使作者能够确定废弃植物填料对合成EN降解性的重要性和影响。
