Premium
Investigation on effects of aluminum and magnesium hypophosphites on flame retardancy and thermal degradation of polyamide 6
Author(s) -
Li Qifei,
Li Bin,
Zhang Shengqiang,
Lin Mo
Publication year - 2012
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.35678
Subject(s) - hypophosphite , polyamide , thermogravimetric analysis , limiting oxygen index , char , materials science , thermal decomposition , fire retardant , magnesium , scanning electron microscope , x ray photoelectron spectroscopy , chemical engineering , composite material , pyrolysis , thermal analysis , polymer chemistry , chemistry , thermal , metallurgy , organic chemistry , physics , meteorology , engineering
Two hypophosphites, aluminum hypophosphite (AlHP) and magnesium hypophosphite (MgHP), were applied to obtain flame retardant polyamide 6 (FR‐PA6) composites. UL‐94 and limiting oxygen index results indicated that AlHP contributed both good flame retardance and antidripping ability for PA6, while MgHP did not. Based on thermogravimetric analysis (TGA), AlHP and MgHP presented the different thermal degradation behavior. That is, the quick decomposition of AlHP took place at lower temperature than that of MgHP. AlHP promoted the early thermal degradation of PA6 and formed more char residue. The thermal decomposition mechanisms of AlHP and MgHP in nitrogen or air were suggested. Scanning electron microscope and X‐ray photoelectron spectroscopy indicated that in the existence of AlHP, the morphological structures of char residue were more homogenous, and compact, and more char residue was formed. These results well illustrated the difference of the flame retardancy between AlHP and MgHP. Mechanical properties of PA6/AlHP and PA6/MgHP were also obtained. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012