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Intumescence in poly(butylene terephthalate): the effect of 2-methyl-1,2-oxaphospholan-5-one 2-oxide and ammonium polyphosphate
Poly(butylene terephthalate) (PBT) is an important polymeric material for the electronics industry. It burns easily and is necessary to improve significantly its fire retardancy. The use of phosphorus-containing compounds as substitutes for halogenated compounds appears to be an attractive solution. The flame-retandant effect of 2-methyl-1,2-oxaphospholan-5-one-oxide (OP) and ammonium polyphosphate (APP) in PBT was studied by the limiting oxygen index and the UL94 test. The combustion and thermal decomposition behavior of APP-OP in PBT was studied. In contrast to APP alone, the mixture of APP with OP is an efficient fire-retandant additive for PBT. It strongly increases the oxygen index and provides a V-0 rating (a self-extinguishing formulation) in the UL94 test by the addition of 15 weight-% APP and 10 weight-% OP. The fire-retardant effect was attributed to the condensed-phase mechanism of intumescence. Upon pyrolysis, the micxture promotes charring, inducing an intumescent effect in PBT. Most likely, the polymer matrix also participates in forming the intumescent shield. OP-APP was shown to cause ammonolysis of PBT, formation of aromatic nitriles in the high-boiling products and phosphorus ester groups and polyphosphoric acid-phosphorus pentaoxide in the solid residue.
Intumescence in poly(butylene terephthalate): the effect of 2-methyl-1,2-oxaphospholan-5-one 2-oxide and ammonium polyphosphate
Poly(butylene terephthalate) (PBT) is an important polymeric material for the electronics industry. It burns easily and is necessary to improve significantly its fire retardancy. The use of phosphorus-containing compounds as substitutes for halogenated compounds appears to be an attractive solution. The flame-retandant effect of 2-methyl-1,2-oxaphospholan-5-one-oxide (OP) and ammonium polyphosphate (APP) in PBT was studied by the limiting oxygen index and the UL94 test. The combustion and thermal decomposition behavior of APP-OP in PBT was studied. In contrast to APP alone, the mixture of APP with OP is an efficient fire-retandant additive for PBT. It strongly increases the oxygen index and provides a V-0 rating (a self-extinguishing formulation) in the UL94 test by the addition of 15 weight-% APP and 10 weight-% OP. The fire-retardant effect was attributed to the condensed-phase mechanism of intumescence. Upon pyrolysis, the micxture promotes charring, inducing an intumescent effect in PBT. Most likely, the polymer matrix also participates in forming the intumescent shield. OP-APP was shown to cause ammonolysis of PBT, formation of aromatic nitriles in the high-boiling products and phosphorus ester groups and polyphosphoric acid-phosphorus pentaoxide in the solid residue.
Intumescence in poly(butylene terephthalate): the effect of 2-methyl-1,2-oxaphospholan-5-one 2-oxide and ammonium polyphosphate
Balabanovich, A.I. (author) / Balabanovich, A.M. (author) / Engelmann, J. (author)
Polymer International ; 52 ; 1309-1314
2003
6 Seiten, 10 Bilder, 2 Tabellen, 15 Quellen
Article (Journal)
English
Polybutylenterephthalat , Ammoniumphosphat , Schäumen , Retardation , flammhemmendes Mittel , flammfester Kunststoff , Pyrolyse , Brandschutz , Phosphorverbindung , Löschung , Polymer , feuerhemmendes Additiv , feuerhemmendes Mittel , Verbrennung (Oxidation) , thermogravimetrische Analyse , Temperaturverhalten , Infrarotspektrometrie , Infrarotspektrum , Schutzmittel , thermische Zersetzung , thermische Eigenschaft , Brandverhalten
Poly (butylene terephthalate)/silica nanocomposites prepared from cyclic butylene terephthalate
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