Design of PP/EPDM/NBR TPVs with tunable mechanical properties via regulating the core-shell structure |
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| Institution: | 1. Chemical Engineering Department, Esfarayen University of Technology, Esfarayen, North Khorasan, Iran;1. Rubber Technology Centre, Indian Institute of Technology Kharagpur, West Bengal, India;2. Department of Chemical Engineering, University of Groningen, Groningen, The Netherlands;1. State Key Laboratory of Polymer Materials Engineering, College of Polymer Science & Engineering, Sichuan University, Chengdu 610065, China;2. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chmeical Technology, Beijing 100029, China;3. Key laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing 100029, China |
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| Abstract: | In this work, polypropylene (PP)/ethylene-propylene-diene monomer (EPDM)/butadiene acrylonitrile rubber (NBR) TPVs with different EPDM/NBR ratios were prepared by the core-shell dynamic vulcanization. The relationship between the core-shell structure and mechanical properties of the TPVs were thoroughly investigated. The formation of core-shell structure by adding NBR is conducive to the mechanical properties of the TPVs. The ratio of EPDM to NBR has an important effect on the structure and performances of the final products, and there is a critical ratio for this effect change. Transmission electron microscope (TEM), tensile test, reprocessing test, ageing test, rheological behavior test and stress relaxation were used to characterize the morphology and properties of the TPVs in detail. It was found that when the ratio of EPDM/NBR was 2:4, the tensile strength increased by ~14% compared with PP/EPDM TPV without NBR. Meanwhile, the reprocessing properties, rheological characteristics and instantaneous tensile deformation, etc. all exhibited sudden changes at this critical ratio. |
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| Keywords: | Dynamic vulcanization Ternary blends Core-shell structure Mechanical properties |
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