Thermo-oxidative degradation of phosphorus-containing polyurethane
作者： T.C. Chang , W.S. Shen , Y.S. Chiu , S.Y. Ho
DOI: 10.1016/0141-3910(95)00116-4
关键词: Thermogravimetry 、 Activation energy 、 Phosphonate 、 Oxidizing agent 、 Degradation (geology) 、 Chemistry 、 Polyurethane 、 Thermogravimetric analysis 、 Polymer chemistry 、 Differential thermal analysis 、 Nuclear chemistry
摘要: The thermo-oxidative degradation of phosphorus-containing polyurethane (PU) incorporating phenylbis(hydroxyethyl)phosphonate was studied by using thermogravimetric analysis (TGA) and differential thermal (DTA) in oxidizing (air) atmospheres. From the resulting data apparent activation energies (Ea) were obtained following methods Flynn, Broido Ozawa. energy first 10% conversion (α) evaluated from a single heating rate (Flynn's Broido's) method is fairly constant, about 120 105 kJmol for common copolyurethanes, respectively. Ozawa method, based on multiple rates, used to evaluate at high conversion. It shown that average (129–137 kJmol) 30% air copolyurethane decreases with increase phosphorus content, Ea (α = 0.4) 0.5) copolyurethanes are greater than polyurethane. This may be rationalized basis formation thermally stable structures.
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