Thermal Degradation of Flame Retarded Polyvinylchloride Cable Sheath in Air Atmosphere

2017 2nd Asia Conference on Power and Electrical Engineering

能源学;电工学

Zhang, Jiaqing^1 ; Wang, Liufang^1 ; Fan, Minghao^1 ; Xie, Hui^1 ; Li, Wei^1 ; Wang, Shuping^1

State Grid Anhui Electric Power Research Institute, Hefei

230601, China^1

关键词: Flame-retarded;    Flynn-Wall-Ozawa;    Model estimates;    Model fitting method;    Model-free method;    Nitrogen atmospheres;    Reaction mechanism;    Thermo-gravimetric experiments;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/199/1/012071/pdf
DOI  :  10.1088/1757-899X/199/1/012071

来源: IOP

【 摘 要 】

A series of thermogravimetric experiments from 10 K/min to 50 K/min was performed to analyse the pyrolysis behaviours and reaction kinetics of typical old flame-retarded PVC cable sheath in air atmosphere. Two model-free methods of Flynn-Wall-Ozawa (FWO) method and Kissinger-Akahira-Sunose (KAS) method were used to estimate the activation energy, as well as the model-fitting method called Coats-Redfern (CR) method. Three peaks can be observed in mass loss rate profiles and the first peak value is much larger than the other two. Due to the oxidation of carbon or others, the first and third peak values in air atmosphere are significantly larger, and the final residue mass fraction in air atmosphere is around 62% the one in Nitrogen atmosphere. FWO method predicts the activation energy of 223.1kJ/mol while KAS model estimates the one of 223.7kJ/mol in air atmosphere, and both have the deviation of 0.27%. By CR method, the most probable reaction mechanism is [1 - (1 - α)-2]/(- 2) for current fire retarded PVC cable sheath. Moreover, it estimates the activation energy of 237.6 kJ/mol, which is well agreeable with those from FWO and KAS methods.