膨胀型阻燃棉织物的热降解动力学

为研究膨胀型阻燃剂对棉纤维热降解行为的影响，采用聚磷酸铵APP/三聚氰胺MEL/季戊四醇（PER）构成的复合膨胀型阻燃体系对棉织物浸轧阻燃整理。采用热失重法分析阻燃整理后棉织物在氮气氛围中不同升温速率下的热降解动力学行为。利用Kissinger、Flynn-Wall-Ozawa和Friedman 3种方法研究膨胀型阻燃棉纤维的动力学参数，并对比探讨膨胀阻燃剂加入前后棉织物的热降解行为。结果表明：APP/MEL/PER膨胀型阻燃剂的加入使棉织物的初始分解温度提前，有效地促进棉织物分解成炭，起到良好的隔热隔氧作用；提高了棉织物的活化能；Kissinger法和Flynn-Wall-Ozawa法求得的活化能值相接近，可靠度较高；但用Friedman法计算的活化能比前二者偏高。

Thermal degradation behaviors and kinetics of intumescent flame-retardant cotton fabric

In order to study the thermal degradation behavior of expanion flame retardant effect on cotton fiber, an intumescent flame-retardant (IFR) coating composed of ammonium polyphosphate (APP) as acid source, pentaerythritol (PER) as carbon source and melamine (MEL) as gas source is deposited on cotton fabric by padding.The thermal degradation behaviors and kineticsof thethe flame-retardantcotton fiber were investigated bythermogravimetry under nitrogen atmosphere atdifferent heating rates.These kinetic parameters were determined by iso-conversional metods containing Kissinger, Flynn-Wall- (FWO) and Friedman methods and the thermal degradation behavior of cotton fabric join expansion flame-retardant before and after has been also evaluated. These results showed that IFR system could reduce the initial decomposition temperature and promote formation of residual char which insulates heat and oxygen into the cotton fabric. Therefore, the activation energy defined as the minimum energy required to start a chemical reaction isincreased. The activation energy values obtained from Kissinger method are similar with those from FWO method. However, it was found that activation energies of IFR cotton fabric calculated by Friedman method arehigher than those from Kissinger and FWO method.