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本文描述用傅里叶变换红外光谱法在位连续测定制备碳纤维用的三种聚丙烯腈原丝在空气中低温(350℃)热解时化学结构的变化。据光谱峰的变化规律和各特征基团吸收强度的实验数据表明,在本实验条件下,兰州丝发生先脱氢后氧化和环化反应,而英国丝和本所样品,其脱氢和氧化反应主要发生在环化反应之后。在比较三种样品成环序列长度时,发现英国原丝在较低温度(260℃)下就可使环序列长度达最大值,而本所自制产品则需要在较高温度(320℃)下才能使环序列长度达最大值,而兰州产品介于中间(300℃)。
This paper describes the sequential determination of the chemical structure of three polyacrylonitrile (PAN) precursors for carbon fiber pyrolysis at low temperature (350 ° C) in air using Fourier Transform Infrared Spectroscopy. According to the experimental results of the change of spectral peak and the absorption intensity of each characteristic group, Lanzhou filaments were oxidized and cyclized pre-dehydrogenated under the conditions of this experiment. However, the dehydrogenation and oxidation The reaction occurs mainly after the cyclization reaction. When comparing the lengths of the loops in the three samples, it was found that the length of the loop sequence can be maximized at a lower temperature (260 ° C) in the UK, while the homebrews require a higher temperature (320 ° C) In order to make the maximum length of the loop sequence, and Lanzhou products in the middle (300 ℃).