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      Influence of PA6 as a Charring Agent on Flame Retardancy, Thermal and Mechanical Properties of LGFR PP Composites

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          Abstract

          In this work, the combustion, thermal, and mechanical performances of long-glass-fiber-reinforced polypropylene/intumescent flame retardant (LGFPP/IFR) composites with different contents of polyamide 6 (PA6) as a charring agent were investigated by limiting oxygen index (LOI), UL-94 test, cone calorimetry, thermal gravimetric analysis (TGA), scanning electron microscopy (SEM), and mechanical property test. The results showed that LGFPP/IFR/PA6 composites exhibited much better flame retardancy due to the dense char layer structure, as proved by SEM. When 15 wt% PA6 was added, the LGFPP/IFR composites had the best flame retardancy, and LOI increased by 55.1 %, and the UL-94 reached V-0 rating. The cone calorimeter tests indicated that PA6 could prevent the transmission of heat and the volatilization of flammable substances, thereby reducing the heat release of “second burning”. According to TGA analysis, the carbon layer began to form at a lower temperature due to the synergistic effect between IFR and PA6. Moreover, the calculation of apparent active energy (E a) revealed that PA6 effectively increased the E a values of the composites, resulting in a better thermal stability and flame retardancy. In addition, PA6 enhanced the mechanical properties of the composites effectively.

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          Most cited references 30

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                Author and article information

                Journal
                ipp
                International Polymer Processing
                Carl Hanser Verlag
                0930-777X
                2195-8602
                10 August 2018
                : 33
                : 4
                : 535-542
                Affiliations
                1 School of Materials and Metallurgy, Guizhou University, Guiyang, Guizhou, PRC
                2 Key Laboratory of Advanced Materials Technology Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, PRC
                3 National Engineering Research Center for Compounding and Modification of Polymer Materials, Guiyang, Guizhou, PRC
                Author notes
                [* ] Correspondence address, Mail address: Xiaolang Chen Key Laboratory of Advanced Materials Technology Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, PRC, E-mail: chenxl612@ 123456sina.com
                Article
                IPP3549
                10.3139/217.3549
                © 2018, Carl Hanser Verlag, Munich
                Page count
                References: 31, Pages: 8
                Product
                Self URI (journal page): http://www.hanser-elibrary.com/loi/ipp
                Categories
                Regular Contributed Articles

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