Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 115, Issue 1, Pages 689-695Publisher
SPRINGER
DOI: 10.1007/s10973-013-3243-8
Keywords
Composites; Expanded graphite; Surface treatment; Flame retardancy; Mechanical properties
Funding
- National Natural Science Foundation of China [51003088]
- Specialized Research Fund for the Doctoral Program of Higher Education [20100184120006]
- National Science and Technology Supporting Project Foundation of China [2007BAB08B05]
- Sishi Star Foundations of Southwest Jiaotong University
- Fundamental Research Funds for the Central Universities [SWJTU12CX009, SWJTU11ZT10]
- national college students innovation experiment program [201210613002]
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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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