摘要
采用热重分析法研究了高流动性聚酰胺6(PA6)在氮气(N_(2))和氧气(O_(2))氛围中的热降解动力学,确定了其热降解机理类型。结果表明:不同升温速率下,PA6在N_(2)中的热降解过程为一步反应,在O_(2)中为二步反应。高温环境中聚合物在O_(2)中的初始降解温度、最大失重速率温度和终止降解温度均低于无氧环境,并且这些特征降解温度在N_(2)和O_(2)氛围中均随升温速率的提高而升高。通过Flynn-Wall-Ozawa(FWO)、Kissinger-Akahira-Sunose(KAS)和Tang 3种拟合方法确定了PA6在N_(2)和O_(2)中的平均热降解活化能分别为258.22 kJ/mol和224.36 kJ/mol,并通过与Coats-Redfern法计算得到不同机理函数时的活化能对比,确定了PA6在N_(2)和O_(2)中的热降解机理函数类型为随机成核后生长的三级减速型(F3型)。
The thermal degradation kinetics of high flow polyamide 6(PA6)in nitrogen(N_(2))and oxygen(O_(2))atmospheres were studied using thermogravimetric analysis,and the type of thermal degradation mechanism was determined.The results show that the thermal degradation process of PA6 in N_(2)at different heating rates is a one-step reaction,while it is a two-step reaction in O_(2).In the high-temperature environment,the polymer exhibits lower initial degradation temperature,maximum weight loss rate temperature,and termination degradation temperature in O_(2)atmospheres compared to an O_(2)free environment.In the meanwhile,these characteristic degradation temperatures increase with the increase of the heating rates in N_(2)and O_(2)atmospheres.The average thermal degradation activation energies of PA6 in N_(2)and O_(2)are determined to be 258.22 kJ/mol and 224.36 kJ/mol respectively,by using three fitting methods:Flynn-Wall-Ozawa(FWO),Kissinger-Akahira-Sunose(KAS),and Tang method.By comparing the activation energies calculated with the Coats-Redfern method for different mechanism functions,it is determined that the thermal degradation mechanism function type of PA6 in N_(2)and O_(2)is the third-order deceleration type after random nucleation growth(F3 type).
作者
黄逸伦
赵嘉玮
王兴国
初立秋
高达利
吴长江
Huang Yilun;Zhao Jiawei;Wang Xingguo;Chu Liqiu;Gao Dali;Wu Changjiang(SINOPEC(Beijing)Research Institute of Chemical Industry Co.,Ltd.,Beijing,100013)
出处
《现代塑料加工应用》
CAS
北大核心
2024年第2期1-4,共4页
Modern Plastics Processing and Applications
关键词
聚酰胺6
热降解
活化能
动力学
polyamide 6
thermal degradation
activation energy
kinetics
作者简介
黄逸伦,博士,副研究员,主要从事高分子复合材料开发及其资源化利用技术研究。;通信联系人:高达利,博士研究生,正高级工程师。E-mail:gaodl.bjhy@sinopec.com。;吴长江,正高级工程师,博导,中国石化首席科学家。
