富勒烯诱导体型中间相沥青形成中间相炭微球
Formation of mesophase microbeads from bulk mesophase pitch induced by fullerene
陈文胜 1刘澜涛 1王政 1段淳枫 1张型伟 1马兆昆 1陈晓红 1宋怀河1
作者信息
- 1. 北京化工大学化工资源有效利用国家重点实验室、材料电化学过程与技术北京市重点实验室,北京 100029
- 折叠
摘要
中间相沥青(Mesophase pitch,MP)形态的可控转变对于研究MP的形成机理和应用具有重要的现实意义.本研究将富勒烯(fullerene,C60)添加于萘基中间相沥青(Naphthalene-based mesophase pitch,NMP)中,并进行热处理,实现了中间相显微形态从融并体型到球状的转变.通过偏光显微镜和扫描电子显微镜研究了 C60添加量和热处理温度对中间相形态转变的影响.热重分析、傅立叶变换红外光谱、X射线衍射和拉曼光谱对C60诱导NMP成球这一物理过程进行了印证.结果表明,在300～320 ℃的热处理温度下,添加5％的C60可以使融并体型中间相转化为球形液晶态MP,中间相小球的尺寸随温度升高而增大.此外,建立了一个模型来解释C60在转变过程中的独特π电子诱导效应.本工作揭示了 C60诱导下的中间相的形态转变行为,为后续中间相形态的调控及应用研究提供了新思路.
Abstract
A transformation of naphthalene-based coalescenced mesophase pitch(NMP)to mesophase microbeads was achieved by heating a mixture of NMP and fullerene(C60).This is different from the conventional process of the liquid-phase carbonization of isotropic pitch to the emergence of carbon microbeads in the matrix and finally their growth to form a 100％anisotropic bulk meso-phase,but rather a reverse transformation.The effects of C60 loading and reaction temperature on the morphological transformation of mesophase were investigated by polarizing optical and scanning electron microscopies.The physical changes in the NMP induced by C60 were characterized by thermogravimetric analysis,Fourier transform infrared spectroscopy,X-ray diffractometry and Raman spectroscopy.The results show that the coalesced NMP can be converted to a spherical type at 300-320 ℃ with the addition of 5％C60,and the size of the mesophase microbeads increases with increasing temperature.Furthermore,a model is established to ex-plain the unique induction effect of C60 in the transformation process.This work makes the morphological transformation of MP con-trollable,and provides a new idea for the understanding and research of mesophase pitch.
关键词
逆向转化/富勒烯诱导机理/中间相织构/π电子诱导效应/中间相微球Key words
Reversible transformation/Fullerene induction mechanism/Mesophase texture/π-electron-induced effect/Mesophase microbeads引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据