Abstract The present work aims to prepare thermal and oxidation resistant Natural Rubber (NR) composites using antioxidant-modified nanosilica (MNS). The thermo-oxidative aging performance of the composites was evaluated by the variations in mechanical properties after aging at 100 °C for 24 h. The performance was further monitored through Scanning Electron Microscopy, Fourier Transform Infrared spectroscopy, Thermogravimetric Analysis, and Dynamic Mechanical Analysis. NR nanocomposite with 1–7.5 phr nanosilica (NS) and 3 phr MNS were prepared and its rheological properties were studied. A comparative study of the theoretical models yielded that modified Guth-Gold equation predicted Young's modulus better than other models. Thermal stability of natural rubber MNS composite was improved by 10 °C with pre-eminent mechanical properties like tensile strength and heat build-up. A linear relationship of compression set with modulus of all composites were also established. Equilibrium swelling test revealed improved crosslink density in NR MNS composite. The strong interaction between antioxidant and nanosilica enabled low migration of antioxidant in NR MNS composite. Hence its protective function after aging showed more effective than NR NS composites. These versatile functional properties of NR MNS composite suggest its potential application in electrical, electronic and high performance rubber products.

中文翻译：

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苯乙烯酚改性纳米二氧化硅改善天然橡胶的热氧化和机械性能

摘要 目前的工作旨在使用抗氧化剂改性的纳米二氧化硅 (MNS) 制备耐热和抗氧化的天然橡胶 (NR) 复合材料。复合材料的热氧化老化性能通过在 100°C 下老化 24 h 后机械性能的变化来评估。通过扫描电子显微镜、傅里叶变换红外光谱、热重分析和动态机械分析进一步监测性能。制备了含有 1-7.5 份纳米二氧化硅 (NS) 和 3 份 MNS 的 NR 纳米复合材料，并研究了其流变特性。对理论模型的比较研究表明，修正后的 Guth-Gold 方程比其他模型更好地预测了杨氏模量。天然橡胶 MNS 复合材料的热稳定性提高了 10°C，具有卓越的机械性能，如拉伸强度和发热。还建立了所有复合材料的压缩永久变形与模量的线性关系。平衡溶胀试验表明 NR MNS 复合材料的交联密度有所提高。抗氧化剂和纳米二氧化硅之间的强相互作用使 NR MNS 复合材料中的抗氧化剂迁移率低。因此其老化后的保护功能比NR NS复合材料更有效。NR MNS 复合材料的这些多功能功能特性表明其在电气、电子和高性能橡胶产品中的潜在应用。平衡溶胀试验表明 NR MNS 复合材料的交联密度有所提高。抗氧化剂和纳米二氧化硅之间的强相互作用使 NR MNS 复合材料中的抗氧化剂迁移率低。因此其老化后的保护功能比NR NS复合材料更有效。NR MNS 复合材料的这些多功能功能特性表明其在电气、电子和高性能橡胶产品中的潜在应用。平衡溶胀试验表明 NR MNS 复合材料的交联密度有所提高。抗氧化剂和纳米二氧化硅之间的强相互作用使 NR MNS 复合材料中的抗氧化剂迁移率低。因此其老化后的保护功能比NR NS复合材料更有效。NR MNS 复合材料的这些多功能功能特性表明其在电气、电子和高性能橡胶产品中的潜在应用。