Peroxide dynamic crosslinking in impact modification of polypropylene with polybutadiene |
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| Institution: | 1. Polymer Processing and Flow (P-PROF) Group, School of Energy, Environment and Materials, King Mongkut''s University of Technology Thonburi (KMUTT), 126 Pracha Uthit Rd., Bang Mod, Thung Khru, Bangkok, 10140, Thailand;2. Department of Materials Engineering, Faculty of Engineering, Kasetsart University, 50 Ngamwongwan Rd., Ladyao, Chatuchak, Bangkok, 10900, Thailand;1. CEITEC – Central European Institute of Technology, Brno University of Technology, Purkynova 656/123, 612 00 Brno, Czechia;2. Unipetrol RPA, Ltd., Polymer Institute Brno, Tkalcovska 36/2, 656 49 Brno, Czechia;3. Ratiochem, Ltd., Tkalcovska 36/2, 602 00 Brno, Czechia;1. Department of Power Mechanical Engineering, National Formosa University, Yunlin 632, Taiwan;2. Department of Mechanical and Mechatronic Engineering, National Taiwan Ocean University, Keelung, Taiwan;3. Electronics and Optoelectronics Research Laboratories (EORL), Industrial Technology Research Institute (ITRI), Taiwan;1. Department of Mechanical Engineering, The Petroleum Institute, P.O. Box 2533, Abu Dhabi, United Arab Emirates;2. Department of Aeronautical & Vehicle Engineering, Division of Lightweight Structures, Royal Institute of Technology - KTH, Teknikringen 8, 100 44 Stockholm, Sweden;1. Group ‘Materials + Technologies’, Chemical and Environmental Engineering Department, Faculty of Engineering, University of the Basque Country (UPV/EHU), Pza. Europa 1, 20018 Donostia-San Sebastián, Spain;2. Polymeric and Renewable Materials Technological Development Center - DENOVO, Andercol S.A., Medellín, Colombia |
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| Abstract: | Polypropylene was blended with polybutadiene in an internal mixer in order to improve its toughness. The rubber content ranged from 10 to 20 wt. % and dicumyl peroxide (DCP) was added to provide required radicals for dynamic crosslinking of polybutadiene, and for in-situ compatibilization of the phases. This was done using two sequences of mixing. In addition, zinc dimethacrylate was utilized as a co-agent to control chain scission of PP, enhance the interfacial reactions and increase compatibility of the components. In obtaining the optimum blend, the Taguchi orthogonal experimental design was applied and results of Izod impact strength test were concordantly related to crystallinity of the polypropylene, morphology of the blends and reactions that may occur. The impact strength was increased about four times at best in comparison to the neat polypropylene, showing versatility of this way of toughening which may be improved further. |
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| Keywords: | Peroxide co-agent Reactive compatibilization Toughened polypropylene |
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