Flame Retardant Lab Report

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Fire and thermal properties of PA 66 resin treated with poly-N- aniline- phenyl phosphamide as a flame retardant

Wenyan Lyu

ABSTRACT In this study, a halogen-free phosphorous–nitrogen synergistic flame retardant, poly-N-aniline-phenyl phosphamide (PDPPD), was synthesized. The Fourier transform Infrared spectroscopy, nuclear magnetic resonance spectroscopy, and elements analysis data confirmed the structure of PDPPD. The essential flame retardant of FR PA66 was polymerized with PA66 pre-polymer and PDPPD pre-polymer, prepared from PDPPD and adipic acid. The limit oxygen index and UL-94 test results of the flame retardant of FR PA66 reached 28% and V-0, respectively, when the contents of PDPPD pre-polymer were 4.5 wt%. The thermogravimetric and differential scanning calorimetry results demonstrated that the initial decomposition temperature of flame retardant of FR PA66 was 43 °C lower than that of pristine PA66 from 385 to 342 °C; however, the peak decomposition temperature was 36 °C higher than that of pure PA66 from 437 to 473 °C, when the contents of PDPPD pre-polymer reached 4.5 wt%. Flame retardant mechanism was studied by cone calorimeter and SEM-EDX, confirming that the HRR, THR, and TSP decreased slightly, and PDPPD functions according to the gas phase flame retardant mechanism.
KEYWORDS: flame retardant; thermal properties; PA66 resin; …show more content…

First, A (3.348 g, 0.031 mol) and triethylamine (6.060 g, 0.060 mol) were added to a glass flask. Then, B (5.850 g, 0.030 mol) was added dropwise to the resulting reaction mixture over a period of 2 h, and the temperature was maintained at 5 °C. The reaction mixtures were carefully maintained at 80 °C for another 5 h. Finally, the reaction mixture was washed with diethyl ether, separated by reduced pressure suction filtration, and dried in a vacuum oven at 100 °C for 12 h to afford a white solid powder, namely, poly-N-aniline-phenyl phosphamide (PDPPD) in 93%

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