中间相
热解
动力学
热的
碳纤维
化学工程
材料科学
化学
复合材料
热力学
有机化学
物理
量子力学
复合数
工程类
相(物质)
作者
Le Ding,Zhao Jiang,Yafang Zhang,Yu Qin,Ting Ouyang
标识
DOI:10.1016/j.jaap.2024.106612
摘要
Mesophase pitch (MP) is an attractive precursor for tailoring high-performance carbon fibers due to its aromatic hydrocarbons mesogenic components that self-assemble into highly ordered microstructures. Relating processing conditions to the evolution of MP microstructure and its inheritance in carbon materials remains a challenge. This work quantitatively determined the kinetics of mesogenic aggregation in MP at spinning temperatures for the first time. Polarized optical microscopy tracked domain size changes in MP during 1 to 24 h thermal soaking. Analysis using an exponential growth model revealed nonlinear growth kinetics with an activation energy of just 39.3 kJ·mol-1, suggesting mesogenic aggregation is facile at processing temperatures compared to mesophase formation. Prolonged thermal soaking promoted microcrystalline development in derived carbon fibers, evident from increased crystallite stacking and reduced interlayer spacing. Relating microstructural evolution in the MP to the resulting carbon fiber structure provides new insights to tailor carbon materials for applications. This work revealed the kinetics of MP at its processing temperature, provides a valuable insight into the future optimization of processing conditions for MP based carbon materials.
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