升温速度对丙烯腈共聚物热解初期形态变化的影响  

THE EFFECT OF RISING TEMPERATURE RATE ON THE MORPHOLOGY CHANGE OF ACRYLONITRILE COPOLYMER DURING THE INITIAL STAGES OF PYROLYSIS

作　　者：赵根祥[1] 陈邦杰[1] 

机构地区：[1]中国科学院山西煤炭化学研究所,太原03000

出　　处：《高分子材料科学与工程》1993年第2期118-121,共4页Polymer Materials Science & Engineering

摘　　要：本文用原位傅里叶变换红外光谱法考察了升温速度对丙烯腈共聚物热解初期的固态产物动态变化过程的影响。实验结果表明,随着加热速度的提高,原有的许多光谱带和新出现的谱带在吸收强度方面均随其结构状态而改变。同时,还获得和对比了一些微弱而有价值的规律光谱信息。并根据I_(804cm^(-1))/I_(2941cm^(-1))和I_(1587cm^(-1))/I_(2243cm^(-1))(吸收强度比)参数的变化,观察到该试样在空气中以慢速升温的脱氢反应主要发生在热解过程的前期,在260℃以后的芳构化反应比快速升温更为剧烈。从而证实了上到大分子链上的氧对芳环分子脱氢缩合反应起到了促进作用。此外,在本实验条件下还发现在同一温度下,R环化度真的最高值大大高于(?)芳香度的最高值。In this paper the effect of rising temperature rate on the dynamic change of solid products of acrylonitrile polymer had been studied by in-situ FTIR spectroscopy during its early stage pyrolysis in air atmosphere. From the variations of the spectrogram and the experimental data of intensity of characteristic peaks it has been observed that with rising heating rate the intensities of some original absorption bands and new absorption bands varies as the structure changes. Simultaneously,some weak and valuable regular spectrum was also observed and compared. Taking the ratio of the absorption intensties of I804cm-1/I294icm-1 and I1587cm-1/ I2243cm-1 for example was calculated approximately. The results showed that the dehydrogenation proceeded mainly before 260℃ with slower rate rising temperature in, air after 260℃the aromatization of the structure of the sample underwent seriously as compared with quicker rate rising temperature. This proves oxygen promoting dehydrogenation and condensation reaction of macromolecules. Also,it is found that the extent of cyclization was more higher than aromatization.

关 键 词：丙烯腈 共聚物 热解 形态 升温速度 

分 类 号：O632.62[理学—高分子化学]