CAJ | 학술논문

用热失重分析方法(TGA),研究了氟醚橡胶在氮气中的热分解规律,并探讨了不同升温条件和不同失重阶段氟醚橡胶的热分解动力学.研究结果表明：在氮气中,氟醚橡胶的热分解过程可分为两个阶段；不同升温速率下其热分解反应机理相同；升温速率越大,氟醚橡胶的分解温度越高.应用等转化率法(Friedman 微分法),在不假设反应机理函数的情况下,分析了氟醚橡胶热分解在不同转化率时的活化能,其平均值为241.4 kJ/mol；同时用Coats-Redfern法分析得出氟醚橡胶在不同升温速率时的热分解动力学参数基本相同.结合两种分析方法提出：氟醚橡胶在氮气中的热分解活化能E为244.3 kJ/mol,最理想的热分解反应机理函数为幂函数法则,其积分形式为g(α)=α3/2.
용열실중분석방법(TGA),연구료불미상효재담기중적열분해규률,병탐토료불동승온조건화불동실중계단불미상효적열분해동역학.연구결과표명：재담기중,불미상효적열분해과정가분위량개계단；불동승온속솔하기열분해반응궤리상동；승온속솔월대,불미상효적분해온도월고.응용등전화솔법(Friedman 미분법),재불가설반응궤리함수적정황하,분석료불미상효열분해재불동전화솔시적활화능,기평균치위241.4 kJ/mol；동시용Coats-Redfern법분석득출불미상효재불동승온속솔시적열분해동역학삼수기본상동.결합량충분석방법제출：불미상효재담기중적열분해활화능E위244.3 kJ/mol,최이상적열분해반응궤리함수위멱함수법칙,기적분형식위g(α)=α3/2.
The thermal decomposition characteristics and kinetics of fluoroether rubber were studied by thermogravimetric technique under pure nitrogen atmosphere.The results suggest that all samples with heating rate from 5K/min to 20K/min show a similar characteristic in their TGA curves,two steps take place in their decomposition processes.And as the heating rate increasing,the degradation temperature of the sample moves to be higher.The method of equal conversion rate (Friedman method)was used to determinate the apparent activity energy at different conversion rates,it is found that the average value of the activity energy is 241.4 kJ/mol.Coats-Redfern method was used to discuss the probable degrada-tion mechanism at different heating rate,it indicates that the thermal degradation mechanism of flu-oroether rubber at different heating rates is the same.Combining the two methods,it can be concluded that the most reasonable thermal degradation mechanism of fluoroether rubber is Mampel power law:g (α)=α3/2 ,and the apparent activity energy is 244.3 kJ/mol.