高等规度聚丙烯腈预氧化环化FT-IR的研究  

Studies on reaction degree of polyacrylonitrile heat-treated under air atmosphere via XRD

作　　者：许志献[1] 徐樑华[1] 代永强[1] 金日光[1] 

机构地区：[1]北京化工大学资源综合利用国家重点实验室

出　　处：《化工新型材料》2008年第8期47-50,共4页New Chemical Materials

基　　金：国家自然科学基金重点项目(50333060)

摘　　要：制备了不同三单元等规含量的聚丙烯腈(PAN),在空气气氛下模拟了预氧化过程,考察了温度、时间等条件对PAN环化反应的影响。用傅立叶红外光谱仪测定了预氧化物FT-IR谱图,并进行了分峰计算,求得了2240cm-1峰的面积和腈基的环化度。结果表明,随着预氧化环化温度或时间的增加,PAN中CN基团反应度逐渐增加,如在预氧化10min和反应温度从250℃升至300℃的条件下,三单元等规度分别为0.64和0.27的PAN中CN的反应度分别从0.55增加到0.89和从0.03增加到0.86。在相同的预氧化温度或时间的条件下,高等规度PAN分子中CN的反应度总是比低等规PAN的高,在270℃预氧化15min时,最大差值达0.39,这种差别随温度的增加逐渐减小。Polyacrylonitrile （PAN） with different tacticity were synthesized. The pre-oxidation samples were produced through the process simulated at different temperatures from 250 to 300 ℃ under air atmosphere for various time, and the effect of temperature and time on cyclization reaction of PAN was investigated by FT-IR. Peak fit and calculation were carried for FT-IR spectra at 2240cm^-1 to calculate peak area and cyclization degree of CN . The results showed that cyclization degree increased gradually with rising temperature/time, e.g. cyclization degree of nitrile groups in PAN with triiad tacticity fraction 0. 64 changed from 0. 55 to 0.89 when heat treated from 250 to 300℃ for 10 min while from 0. 03 to 0.86 in PAN with triad tacticity fraction 0. 27. At same temperature/time, cyclization degree of nitrile groups in i PAN molecule was always bigger than that in a PAN molecule, the largest difference of reaction degree between i-PAN and a- PAN was 0. 39 when heat treated at 270℃ for 15min.

关 键 词：高等规度PAN 预氧化环化 FT-IR 

分 类 号：TQ340.1[化学工程—化纤工业]