STRUCTURAL TRANSFORMATIONS IN HIGH-TEMPERATURE TREATMENT OF OXIDIZED POLYACRYLONITRILE FIBERS

被引：0
|
作者：
NAZAROVA, VA
BONDARENKO, VM
AZAROVA, MT
机构：
[1] All-Russian Scientific-Research Institute of Polymers Fibres, Mytishchi
来源：
FIBRE CHEMISTRY | 1995年 / 27卷 / 01期
关键词：
D O I：
10.1007/BF00551521
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
A mechanism of gradual ordering of the structure in heat treatment of oxidized polyacrylonitrile fibres is proposed and consists of condensation of low-molecular-weight chain fragments of the unordered phase obtained during degradation in macromolecules which preserve the orientation as in the matrix. It was hypothesized that the temperature of 700 degrees C is the beginning of formation of ribbon structures. The formation of graphite-like parquet structures begins in the 800-1000 degrees C range. It was shown that elimination of nitrogen at 1000-1100 degrees C loosens the parquet structures and decreases the density of the fibre.
引用
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页码：10 / 14
页数：5
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