The improvement of flame retardants in controlling polymer combustion behavior is mainly based on their effect on the polymer thermal degradation behavior. In this article, the Kissinger method and Flynn-Wall-Ozawa method were used to study the thermal degradation behavior of alginate (Alg)/graphene composite fibers. The results of activation energy calculated by the two methods were very consistent. The addition of a graphene-based flame retardant (GO-DOPO-V, where GO represents graphene oxide, DOPO represents 9,10-dihydro-9-oxy-10-phosphoxanthine-10-oxide and V represents vinyltrimethoxysilane) increased the thermal degradation activation energy of the Alg composite fiber and enhanced the thermal stability and flame retardancy of the fiber. The Flynn-Wall-Ozawa method further revealed that the addition of GO-DOPO-V induced a condensation reaction of the polymer at the early degradation stage of the Alg composite fibers, leading to a decrease in the thermal degradation activation energy. At the final stage of the thermal degradation, with the formation of a char layer, the thermal degradation and activation energy of the Alg composite fibers were improved under the action of GO-DOPO-V, and the flame retardancy of the Alg composite fibers was enhanced.
Guixiang Xie,Yaqi Lu,Xiaochun Lu,Zhusen Zhang,Shuidong Lin
Thermogravimetric analysis (TGA) has been extensively applied in polymeric characterization and quality inspection, facilitating in-depth investigations of the microstructural thermal response characteristics of polymers, including thermal stability, composition analysis, and thermal decomposition mechanisms. Here, the impacts of six factors on the TG thermal analysis curves obtained during operation are systematically examined while analyzing their causes and recommending solutions. Furthermore, the thermal degradation kinetics of an ionomer formed by neutralizing an ethylene–methacrylic acid copolymer with metal ions (SGP membrane) used in laminated tempered glass is analyzed using the Arrhenius equation, Ozawa–Flynn–Wall hypothesis and Kissinger method. Kinetic parameters at 5% degradation are fitted and used to predict the service lifetime of the SGP membrane. The results indicate that the SGP membrane sample exhibits activation energyEa= 136.90 kJ/mol, reaction ordern= 1.65 and pre-factorA= e25.93. It can be seen that the service lifetime of the SGP membrane sample is 16 years at 80 °C and 1.65 years at 100 °C.
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