王梦梵,李龙,高益军,孔德玉,徐樑华,曹维宇

• 1:北京化工大学有机无机复合材料国家重点实验室
• 2:北京化工大学碳纤维及功能高分子教育部重点实验室

摘要(Abstract)：

采用SAXS和HRTEM方法从倒易空间和实空间分别研究了PAN纤维碳化及石墨化过程中长周期结构及其变化。通过HRTEM测试发现碳纤维中存在由石墨微晶的有序堆砌结构,无序堆砌结构及过渡区形成的层状长周期结构,同时碳纤维的SAXS赤道方向散射曲线中出现肩峰,说明这种长周期结构沿纤维径向堆砌。通过SAXS研究发现,在PAN纤维碳化过程中长周期结构从700℃时开始出现且其尺寸随热处理温度的变化呈先增大后减小的趋势,转折温度区域约为1350℃左右。通过一维相关函数分析,计算了长周期结构中石墨微晶有序堆砌结构尺寸(Lo)、无序堆砌结构尺寸(Ld)、过渡区尺寸(Ltr)随热处理温度的变化:1350℃之前,Lo、Ld趋于增大,而Ltr趋于减小;1350℃之后3个参数均呈减小的趋势。

关键词(KeyWords)： PAN基碳纤维;小角X射线散射(SAXS);长周期结构;相关函数;温度依赖性

Abstract:

Keywords:

基金项目(Foundation): 国家重点基础研究发展计划(2011CB605603)

作者(Author): 王梦梵,李龙,高益军,孔德玉,徐樑华,曹维宇

DOI: 10.13289/j.issn.1009-6264.2015.01.001

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