Thermal Oxidative Degradation and Ageing Performance of Silicone Rubber Filled with Attapulgite |
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Authors: | Hua-hua Zhao Huan-ling Song Xin-yao Tao Ge-xin Chen Ai-qin Wang Ling-jun Chou |
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Institution: | State Key Laboratory for Oxo Synthesis and Selective Oxidation,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China;Zhejiang Neoglory Jewelry Co.,Ltd,Yiwu 322013,China;Yiwu R&D center for functional materials of LICP,Chinese Academy of Sciences,Yiwu 322000,China;Key Laboratory of Clay Mineral Applied Research of Gansu Province,Center of Eco-materials and Green Chemistry,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China |
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Abstract: | The natural attapulgite (NAPT) was disaggregated by high-pressure homogenization technology combined with extrusion process to prepare the attapulgite with disaggregated rod crystal bundles (DAPT) and large specific surface area of 133.7 m2/g. NAPT and DAPT were incorporated into the silicone rubber to obtain the composite NAPT-SR and DAPT-SR by mechanical blending method, respectively. After thermal oxidative ageing at 300 ℃ for 0.5 h, temperature for the 5% weight loss increased greatly from 385 ℃ of the neat silicone rubber to 396℃ - 399 ℃ with addition of NAPT and DAPT. NAPT and DAPT enhanced the interaction between the filler nanoparticles and rubber matrix thus inhibited the nanoparticle agglomeration. The conservation rate of the side methyl group in NAPT-SR and DAPT-SR was greatly improved after ageing. Therefore, the thermal oxidative degradation and ageing performance of the silicone rubber composites was significantly reinforced. Moreover, DAPT could greatly restrain the growth of nanoparticles after ageing. Therefore, DAPT-SR showed the better retention of tensile strength (40.6%), elongation at break (34.9%) and tear strength (30.1%) compared with the corresponding mechanical properties of the neat silicone rubber (10.6%, 7.4%, and 5.0%) after ageing. |
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Keywords: | Silicone rubber Attapulgite Composites Thermal oxidative degradation Ageing |
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