1. One-pot synthesis of a novel s-triazine-based hyperbranched charring foaming agent and its enhancement on flame retardancy and water resistance of polypropylene.
- Author
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Wen, Panyue, Wang, Xiaofeng, Wang, Bibo, Yuan, Bihe, Zhou, Keqing, Song, Lei, Hu, Yuan, and Yuen, Richard K.K.
- Subjects
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TRIAZINES , *SURFACE active agents , *FIRE resistant polymers , *WATER , *POLYPROPYLENE , *CHEMICAL synthesis , *THERMOGRAVIMETRY - Abstract
A novel hyperbranched charring foaming agent (HCFA), successfully prepared via an A 2 B 3 approach with about 97% yield, was combined with ammonium polyphosphate (APP) to flame-retard polypropylene (PP) at a 30 wt% loading. The results of thermogravimetric analyses of various PP samples in air and nitrogen showed that the HCFA/APP system could effectively improve the thermal and thermal-oxidative stabilities of the char residues. And PP3 with a 3/1 mass ratio of APP to HCFA left the highest amount of char residue at 800 °C. The studies of their flammability revealed that the addition of HCFA can make great contribution to the increase of the limiting oxygen index and the UL-94 V0 rating, and the decrease of the heat release rate (HRR) and fire growth index (FGI) of PP/APP/HCFA composites relative to PP with 30 wt% APP. The investigation of their water resistance demonstrated that the PP composites with a mass ratio of APP to HCFA being between 3:1 and 1:1 still obtained a UL-94 V-0 rating after 168 h soaking in hot water, due to the delayed migration of intumescent flame retardant from the complexation between hydrophilic APP and hydrophobic HCFA. Besides, their mechanical properties were also investigated. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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