APP is a conventional acid
source and also a kind of very popular and common inorganic
phosphorus/nitrogen flame retardant, and it is halogenfree
and eco-friendly; however, its flame-retardant efficiency
is yet to be improved, APP is moisture sensitive, and
it easily exudes from matrix at a drippy circumstance during
service life, which would result in a decrease in the flameretardant
properties of the polymer composites. Meanwhile,
due to its poor compatibility in polymer matrix, APP may
compromise the mechanical properties of PU