GENİŞLEYEN GRAFİT VE ORGANOKİLİN KABARAN AMONYUM POLİFOSFAT ESASLI POLİPROPİLEN/KARBON ELYAF KOMPOZİTLERİN ALEV GECİKTİRİCİ, ISIL VE MEKANİK ÖZELLİKLERİNE ETKİSİ

Bu çalışmada; sinerjik etki yaratmak amacıyla kullanılan genişleyen grafit (GG) ve organokilin (OK) kabaran amonyum polifosfat (APP) içeren polipropilen (PP)/karbon elyaf (KF) kompozitlerin güç tutuşurluk, ısıl ve mekanik özellikleri üzerine etkileri incelenmiştir. Üretilen kompozitlerin ısıl ve güç tutuşurluk özellikleri termogravimetrik analiz (TGA), sınırlayıcı oksijen indeksi (LOI) ve UL-94 testleriyle, mekanik özellikleri ise dinamik mekanik analiz (DMA) ve çekme testleriyle incelenmiştir. Test sonuçları, ağırlıkça %1 GG kullanımının kül oluşumunu artırarak güç tutuşurluk özelliklerini iyileştirdiğini göstermiştir. %1 ve 3 oranında OK ilavesinin ise kompozitlerin mekanik özelliklerini iyileştirdiği fakat güç tutuşurluk özelliklerini iyileştirmeye katkı sağlamadığı gözlemlenmiştir.

THE ROLE OF EXPANDABLE GRAPHITE AND ORGANOCLAY ON THE FLAME RETARDANT AND MECHANICAL PROPERTIES OF CARBON FIBER FILLED INTUMESCENT POLYPROPYLENE COMPOSITES

In this study, the effects of expendable graphite (GG) and organoclay (OK), which are used for creating synergistic effect, on the flame retardant, thermal and mechanical properties of the ammonium polyphosphate (APP) containing polypropylene (PP) / carbon fiber (KF) composites have been investigated. The thermal and flammability properties of the composites are investigated by thermogravimetric analysis (TGA), limiting oxygen index (LOI) and UL-94 tests. The mechanical properties are examined by making dynamic mechanic analysis (DMA) and tensile tests. The test results show that the use of 1 wt% GG improves the flammability properties via the increased char formation. The mechanical properties are improved with the addition of 1 and 3 wt % OK whereas no improvement in flammability properties is observed.

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Rezaei, F., Yunus, R., Ibrahim, NA., (2009), Effect of fiber length on thermomechanical properties of short carbon fiber reinforced polypropylene composites, Materials & Design, 30(2), 260-263.
Unterweger, C., Brüggemann, O., Fürst, C., (2014), Effects of different fibers on the properties of short-fiber-reinforced polypropylene composites, Composites Science and Technology, 103, 49-55.
Fu, S-Y., Lauke, B., Mäder, E., Yue, C-Y., Hu, X., (2000) Tensile properties of short-glass-fiber-and short-carbon-fiber-reinforced polypropylene composites, Composites Part A: Applied Science and Manufacturing, 31(10), 1117-1125.
Karsli, NG., Aytac, A., (2011), Effects of maleated polypropylene on the morphology, thermal and mechanical properties of short carbon fiber reinforced polypropylene composites, Materials & Design, 32(7), 4069-4073.
Unterweger, C., Duchoslav, J., Stifter, D., Fürst, C., Characterization of carbon fiber surfaces and their impact on the mechanical properties of short carbon fiber reinforced polypropylene composites, (2015), Composites Science and Technology, 108, 41-47.
Atabek Savaş, L., Mutlu, A., Dike, AS., Tayfun, U., Doğan, M., (2017), Effect of carbon fiber amount and length on flame retardant and mechanical properties of intumescent polypropylene composites, Journal of Composites Materials.
Nie, S., Liu, X., Wu, K., Dai, G., Hu, Y., (2013) Intumescent flame retardation of polypropylene/bamboo fiber semi-biocomposites, Journal of thermal analysis and calorimetry, 111(1), 425-30.
Kim, N., Bhattacharyya, D., (2016), Development of fire resistant wool polymer composites: Mechanical performance and fire simulation with design perspectives, Materials & Design, 106, 391-403.
Zhang, ZX., Zhang, J., Lu, B-X., Xin, ZX., Kang, CK., Kim, JK., (2012), Effect of flame retardants on mechanical properties, flammability and foamability of PP/wood–fiber composites. Composites Part B: Engineering, 43(2), 150-158.
Matko, S., Toldy, A., Keszei, S., Anna, P., Bertalan, G., Marosi, G., (2005), Flame retardancy of biodegradable polymers and biocomposites, Polymer Degradation and Stability, 88(1):138-145.
Schartel, B., Braun, U., Schwarz, U., Reinemann, S., (2003), Fire retardancy of polypropylene/flax blends, Polymer, 44(20), 6241-6250.
Wang, W., Zhang, S., Wang, F., Yan, Y., Li, J., Zhang, W., (2014), Effect of microencapsulated ammonium polyphosphate on flame retardancy and mechanical properties of wood flour/polypropylene composites, Polymer Composites.
Han, L., Wu, W., Qi, Y., Qu, H., Xu, J., (2015), Synergistic flame retardant effect of BiFeO3 in intumescent flame-retardant polypropylene composites, Polymer Composites, 2015.
Wang, W., Peng, Y., Chen, H., Gao, Q., Li, J., Zhang, W., (2015), Surface microencapsulated ammonium polyphosphate with beta - cyclodextrin and its application in wood-flour/polypropylene composites, Polymer Composites.
Wang, W., Peng, Y., Dong, Y., Wang, K., Li, J., Zhang, W., (2016), Effect of coupling agent modified intumescent flame retardant on the mechanical properties, thermal degradation behavior, and flame retardancy of wood-flour/polypropylene composites, Polymer Composites.
Doğan, M., Yılmaz, A., Bayramlı, E., (2010), Synergistic effect of boron containing substances on flame retardancy and thermal stability of intumescent polypropylene composites. Polymer Degradation and Stability, 95(12), 2584-2588.
Liu, Y., Deng, C-L., Zhao, J., Wang, J-S., Chen, L., Wang, Y-Z., (2011), An efficiently halogen-free flame-retardant long-glass-fiber-reinforced polypropylene system, Polymer degradation and stability, 96(3), 363-370.
Yu, F., Xu, F., Song, Y., Fang, Y., Zhang, Z., Wang, Q., Wang, F., (2015), Expandable graphite's versatility and synergy with carbon black and ammonium polyphosphate in improving antistatic and fire-retardant properties of wood flour/polypropylene composites, Polymer Composites.
Guo, C., Zhou, L., Lv, J., (2013), Effects of expandable graphite and modified ammonium polyphosphate on the flame-retardant and mechanical properties of wood flour-polypropylene composites, Polymers & Polymer Composites, 21(7), 449-456.
Du, B., Ma, H., Fang, Z.,(2011), How nano-fillers affect thermal stability and flame retardancy of intumescent flame retarded polypropylene, Polymers for Advanced Technologies, 22(7), 1139-1146.
Zhang, S., Horrocks, AR., Hull, R., Kandola, BK., (2006), Flammability, degradation and structural characterization of fibre-forming polypropylene containing nanoclay–flame retardant combinations, Polymer Degradation and Stability, 91(4), 719-725.
Du, B., Guo, Z., Song, Pa., Liu, H., Fang, Z., Wu, Y., (2009), Flame retardant mechanism of organo-bentonite in polypropylene, Applied Clay Science, 45(3), 178-184.
Liu, Y., Zhao, J., Deng, C-L., Chen, L., Wang, D-Y., Wang, Y-Z., (2011), Flame-retardant effect of sepiolite on an intumescent flame-retardant polypropylene system, Industrial & Engineering Chemistry Research, 50(4), 2047-2054.
Tang, Y., Hu, Y., Li, B., Liu, L., Wang, Z., Chen, Z., Fan, W., (2004), Polypropylene/montmorillonite nanocomposites and intumescent, flame-retardant montmorillonite synergism in polypropylene nanocomposites, Journal of Polymer Science Part A: Polymer Chemistry, 42(23), 6163-6173.
Doğan, M., Bayramlı, E., (2011), Synergistic effect of boron containing substances on flame retardancy and thermal stability of clay containing intumescent polypropylene nanoclay composites. Polymers for Advanced Technologies, 22(12), 1628-1632.
Tang, Y., Hu, Y., Wang, S., Gui, Z., Chen, Z., Fan, W., (2003), Intumescent flame retardant–montmorillonite synergism in polypropylene-layered silicate nanocomposites, Polymer international, 52(8), 1396-1400.
Du, B., Guo, Z., Fang, Z., (2009), Effects of organo-clay and sodium dodecyl sulfonate intercalated layered double hydroxide on thermal and flame behaviour of intumescent flame retarded polypropylene, Polymer Degradation and Stability, 94(11), 1979-85.
Yi, D., Yang, R., (2010), Ammonium polyphosphate/montmorillonite nanocompounds in polypropylene, Journal of applied polymer science, 118(2), 834-840.
Le Bras, M., Bourbigot, S., (1996), Mineral fillers in intumescent fire retardant formulations—criteria for the choice of a natural clay filler for the ammonium polyphosphate/pentaerythritol/polypropylene system, Fire and Materials, 20(1), 39-49.
Bai, G., Guo, C., Li, L., (2014), Synergistic effect of intumescent flame retardant and expandable graphite on mechanical and flame-retardant properties of wood flour-polypropylene composites. Construction and Building Materials, 50, 148-53.
Seefeldt, H., Braun, U., Wagner, MH., (2012), Residue stabilization in the fire retardancy of wood–plastic composites: Combination of ammonium polyphosphate, expandable graphite, and red phosphorus, Macromolecular chemistry and physics, 213(22), 2370-2377.