The role of organic phosphite primary structure in the overall stabilization performance in polypropylene |
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| Institution: | 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 Astronautical Science and Mechanics, Harbin Institute of Technology, Harbin 150001, People''s Republic of China;2. Center of Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, People''s Republic of China;2. Department of Civil Engineering, Federal University of São Carlos, Brazil;3. Federal Centre for Technological Education of Minas Gerais, Department of Civil Engineering, Brazil;4. Advanced Composites Centre for Innovation and Science, University of Bristol, UK;1. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China;2. Department of Chemical and Biomolecular Engineering, The Hong Kong University of Science and Technology, Hong Kong 999077, China;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 |
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| Abstract: | The role of the primary P3+ functionality in the phosphite overall stabilization performance was re-evaluated. Tris(2,4-di-t-Bu-phenyl)phosphite (P-1) and its oxidation product tris(2,4-di-t-Bu-phenyl)phosphate (P-1ox) were tested both alone and in the presence of hindered phenol during processing in polypropylene. Efficiencies were quantified using the processing degradation index (PDI). The position of the traditional multiple extrusion curve was determined by a single parameter, describing the degree of polymer degradation. Its reciprocal allowed calculating formulations relative efficiencies. It was shown that oxidation of P3+ into P5+ is responsible for 75 % phosphite stabilization performance, regardless phosphite acts alone or in combination with phenol. If P3+ is completely oxidized, stabilizer still works. For the residual performance, the reactions of 2,4-di-t-Bu-phenyl substituents (secondary structure), are responsible. Besides processing, reactions of P3+ also contribute to the long-term stability at 150 °C. Once phosphite is oxidized, the secondary structure does not contribute to the long-term stability at all. |
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| Keywords: | Phosphite Phosphate Oxidation Action mechanism Processing |
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