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Flame‐retardant action of red phosphorus/magnesium oxide and red phosphorus/iron oxide compositions in recycled PET
Author(s) -
Laoutid F.,
Ferry L.,
LopezCuesta J. M.,
Crespy A.
Publication year - 2005
Publication title -
fire and materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.482
H-Index - 58
eISSN - 1099-1018
pISSN - 0308-0501
DOI - 10.1002/fam.914
Subject(s) - char , fire retardant , magnesium , phosphorus , ternary operation , thermal decomposition , materials science , combustion , oxide , chemical engineering , decomposition , nuclear chemistry , chemistry , inorganic chemistry , metallurgy , organic chemistry , computer science , programming language , engineering
Red phosphorus was combined with metallic oxides Fe 2 O 3 and MgO to improve the fire properties of recycled PET. Both Fe 2 O 3 and MgO act as co‐synergist agents at a total loading of 5 wt%. The analysis by diffraction X of the char formed during combustion shows that transformation of Fe 2 O 3 to Fe 3 O 4 occurs. Fe 2 O 3 favours the oxidation and improves the effectiveness of red phosphorus. It is suggested that MgO interacts with acidic end groups of PET and forms a thermal stable residue. The thermal decomposition of recycled PET containing red phosphorus combined with Fe and Mg oxides was studied by thermal analysis and leads to an increase in char formation. While the incorporation of Fe 2 O 3 in this ternary blend maintains the mechanical properties of PET, the reactivity of MgO leads to a brittle material. The use of reinforcements (talc and glass fibres) to mechanically stabilize the char formed during combustion of ternary blend with Fe 2 O 3 entails a further decrease in heat release rate, nevertheless impact resistance of the material decreases dramatically. Copyright © 2005 John Wiley & Sons, Ltd.