Polímeros

Controle de Qualidade de Polímeros por meio de DSC - Estabilidade Oxidativa

Testes Oxidative-Induction Time (OIT) and Oxidative-Onset Temperature (OOT)Oxidative Induction Time (isothermal OIT) is a relative measure of the resistance of a (stabilized) material to oxidative decomposition. Oxidative-Induction Temperature (dynamic OIT) or Oxidative-Onset Temperature (OOT) is a relative measure of the resistance of a (stabilized) material to oxidative decomposition.OIT (Tempo de Indução Oxidativa) são bem conhecidos para avaliar a resistência oxidativa de polímeros, em particular, poliolefinas.

Neste exemplo, duas amostras PP foram aquecidas a 200°C em atmosfera dinâmica de nitrogênio. O pico EndotérmicoA sample transition or a reaction is endothermic if heat is needed for the conversion.endotérmico detectado durante o aquecimento ilustra a fusão do polipropileno. Após 3 minutos a 200°C, o gás foi trocado para ar. O resultado do efeito ExotérmicoA sample transition or a reaction is exothermic if heat is generated.exotérmico indica a degradação polimérica.

No caso presente, a oxidação ocorre antes para a Amostra A do que para a Amostra B (Oxidative-Induction Time (OIT) and Oxidative-Onset Temperature (OOT)Oxidative Induction Time (isothermal OIT) is a relative measure of the resistance of a (stabilized) material to oxidative decomposition. Oxidative-Induction Temperature (dynamic OIT) or Oxidative-Onset Temperature (OOT) is a relative measure of the resistance of a (stabilized) material to oxidative decomposition.OIT 6.6 min vs. 11.6 min).

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Teste Oxidative-Induction Time (OIT) and Oxidative-Onset Temperature (OOT)Oxidative Induction Time (isothermal OIT) is a relative measure of the resistance of a (stabilized) material to oxidative decomposition. Oxidative-Induction Temperature (dynamic OIT) or Oxidative-Onset Temperature (OOT) is a relative measure of the resistance of a (stabilized) material to oxidative decomposition.OIT em PP. Massas das Amostras: 9.48 mg (Amostra A) e 9.55 mg (Amostra B); Aquecimento a 200°C a 20 K/min em N₂ (50 ml/min), IsotermaTests at controlled and constant temperature are called isothermal.isoterma de 3 min em N₂, isoterma em ar (50 ml/min) até degradação.