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Semiaromatic polyamide poly(hexamethylene terephthalamide)‐ co ‐polycaprolactam: Thermal and flame‐retardant properties
Author(s) -
Peng WeiMing,
Tong Xin,
Zhang MeiLin,
Wang XiaoJun,
Zhang Gang,
Long ShengRu,
Yang Jie
Publication year - 2018
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.46451
Subject(s) - limiting oxygen index , fire retardant , materials science , thermogravimetric analysis , composite material , differential scanning calorimetry , phosphinate , cone calorimeter , polyamide , ultimate tensile strength , calorimetry , polymer chemistry , chemical engineering , combustion , chemistry , organic chemistry , char , physics , engineering , thermodynamics
The poly(hexamethylene terephthalamide)‐ co ‐polycaprolactam (PA6T/6; 50:50) copolymer was synthesized with a reactive extrusion method and subsequently mixed with a certain content of glass fibers (GFs) and different ratios of flame‐retardant aluminum diethyl phosphinate (AlPi) to fabricate a series of composites. These resulting composites were found to have excellent mechanical (tensile strength = 119–154 MPa) and thermal properties (heat‐deflection temperature = 263–293 °C). It is particularly worth mentioning that the value of the limiting oxygen index reached 29.5% and a UL‐94 V‐0 rating (1.6 mm) was achieved with the addition of 20 portions of AlPi. Also, the values of the peak heat‐release rate and total heat release in cone calorimetry were found to decrease with the addition of the flame‐retardant AlPi, which acted mainly as a flame inhibitor in the gas phase. Through visual observation, scanning electron microscopy after cone calorimetry testing, and thermogravimetric analysis, the condensed‐phase flame‐retardant mechanism of the PA6T/6–GF–AlPi system was confirmed to have a synergetic role. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46451.