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Influences of coupling agent on thermal properties, flammability and mechanical properties of polypropylene/thermoplastic polyurethanes composites filled with expanded graphite |
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| Authors: | Yang Xu Man Chen Xin Ning Xiaolang Chen Zhidan Sun Yonghong Ma Jie Yu Zhibin Zhang Xiaojin Bo Le Yang Zining Chen |
| Institution: | 1. Key Laboratory of Advanced Materials Technology, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, China 3. School of Life Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, China 2. National Engineering Research Center for Compounding and Modification of Polymer Materials, Guiyang, 550014, China |
| Abstract: | In this study, polypropylene (PP)/thermoplastic polyurethanes (TPU) filled with inorganic intumescent flame retardant expanded graphite (EG) was prepared by melt blending in a twin-screw extruder. The thermal stability, fire retardancy, mechanical properties, and fracture morphology of PP/TPU composites with treated and untreated EG were investigated by thermogravimetric analysis, cone calorimeter, and scanning electron microscope. The results showed that both untreated and treated EG can greatly enhance the thermal stability and fire resistance of polymer matrix materials. Compared with untreated EG, treated EG can further improve the flame retardancy of the composites. For example, treated EG can further reduce the heat release rate, total heat release, and CO emissions of the composites in the combustion. Surface treatment of EG could significantly improve elongation at break and impact strength of PP/TPU/EG composites due to its enhanced interfacial adhesion and the good dispersion of EG particles in the polymer matrix. |
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