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Syntheses and Thermal Properties of Phosphorus Containing Epoxy Polymers
|關鍵字:||phosphorylated curing agent;含磷硬化劑;epoxy polymer;activation energy;LOI;環氧樹脂;活化能;極限氧指數值||出版社:||材料工程學研究所||摘要:||
Two series of novel phosphoric amide containing amine curing agents (P%=3~15) were developed in this study. These curing agents were characterized by FTIR, amine titration, elemental analysis and NMR. The curing reactions of these phosphorylated curing agents were studied by differential scanning calormeter (DSC) using dynamic methods. Activation energies of the epoxy monomer BE188 cured with aliphatic or aromatic curing agents were also determined, and the value calculated from aromatic curing agents were larger than those of aliphatic curing agents. These phosphorylated epoxy polymers possessed lower degradation temperatures and higher char yields as compared to the pristine epoxy polymers. The first stage of degradation, which results from the decomposition of phosphorus containing functional groups, exhibited lower activation energy than the other stages. Larger limited oxygen index (LOI) values as well as higher char yields of these polymeric epoxy resins confirmed the effectiveness of phosphorylated epoxy polymers as flame retardants. From TGA data, different degradation stages were found in nitrogen and air, respectively. The kinetic of thermal degradation of phosphorylated epoxy polymers based on BE188 and the above-mentioned curing agents were also studied by Ozawa method. It was found that the epoxy polymer containing aromatic components exhibited larger degradation activation energies. Based on the above, facile introduction of the phosphorus containing functional groups into commercial curing agents has been achieved in this study. As a result of that, the phosphorylated epoxy polymers exhibit enhanced flame retardation properties.
|Appears in Collections:||材料科學與工程學系|
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