Styrenated phenol modified nanosilica for improved thermo-oxidative and mechanical properties of natural rubber |
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| Institution: | 1. Department of Polymer Science and Rubber Technology, Cochin University of Science and Technology, Kerala, Pin-682022, India;2. Department of Chemistry, St. Aloysius College, Elthuruth, Thrissur, Kerala, Pin-680611, India;1. College of Materials Science and Engineering, Hainan University, Haikou, 570228, China;2. School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Shenzhen, 518172, China;1. Beijing Engineering Research Center of Advanced Elastomers, Beijing University of Chemical Technology, Beijing 100029, China;2. Engineering Research Center of Elastomer Materials Energy Conservation and Resources, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China;3. Department of Materials Science and Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA |
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| 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. |
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| Keywords: | Natural rubber Rheological properties Theoretical modelling Thermo-oxidative resistance Dynamic mechanical analysis |
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