中间相沥青基泡沫炭发泡过程及其动力学研究  

Foaming Process of Mesophase Pitch-derived Carbon Foam and Its Kinetic Research

作　　者：陈石林[1] 卢梦哲 郭建光[1] 段桂英 陈林[1] CHEN Shilin;LU Mengzhe;GUO Jianguang;DUAN Guiying;CHEN Lin(College of Materials Science and Engineering,Hunan University,Changsha410082,China)

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2018年第12期73-79,共7页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51472082)~~

摘　　要：以AR中间相沥青为原料,结合TG、黏度分析、MS及IR等表征方法研究了中间相沥青基泡沫炭的发泡过程及其动力学特征.结果表明:中间相沥青在发泡过程中主要发生脂肪碳链的热解反应并释放出H2、CH4、H2O和CO等气体,导致熔融沥青中的分子组成产生变化,进而引起其黏度变化.在此基础上采用TG分析模拟不同升温速率及发泡温度下中间相沥青的失重过程,并通过拟合中间相沥青恒温阶段的TG曲线,发现中间相沥青的恒温失重率Δw与发泡时间tb成较好的线性关系,结合Arrhenius方程计算得到不同升温速率下恒温发泡过程的动力学参数.此研究工作对于中间相沥青基泡沫炭的可控制备具有较好的理论指导作用.Using AR mesophase pitch as precursor,the foaming process and its kinetic characteristic of mesophase pitch-derived carbon foam were studied by thermogravimetry,viscosity analysis,mass spectroscopy,and Fourier transform infrared spectroscopy.The results suggest that the aliphatic chains of pitch decomposed during foaming process,thus gases such as H2、CH4、H2O and CO were released,and the chemical structures of the pitch were changed,which led to the change of viscosity.In addition,the effect of heating rate and foaming temperature on foaming process of mesophase pitch was investigated based on thermogravimetric analysis,and it was found that mass loss(Δw)at a constant foaming temperature was proportional to a simple fractional exponent of foaming time(tb).A simple mathematical model was proposed to describe the kinetics of isothermal foaming process for mesophase pitch with respect to heating rate effect by the Arrhenius equation,this research has a theoretical guidance for the controllable preparation of mesophase pitch-derived carbon foams.

关 键 词：中间相沥青 发泡过程 动力学 数学模型 

分 类 号：TB322[一般工业技术—材料科学与工程]