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
APP is a conventional acidsource and also a kind of very popular and common inorganicphosphorus/nitrogen flame retardant, and it is halogenfreeand eco-friendly; however, its flame-retardant efficiencyis yet to be improved, APP is moisture sensitive, andit easily exudes from matrix at a drippy circumstance duringservice life, which would result in a decrease in the flameretardantproperties of the polymer composites. Meanwhile,due to its poor compatibility in polymer matrix, APP maycompromise the mechanical properties of PU
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