摘要
用元素分析、IR、X射线衍射及ESR等分析方法详细讨论了对甲基酚醛树脂在不同温度下热解产物的结构特性。
The structural characteristic of products obtained from the pyrolysis of para-cresol-formaldehyde resin in the temperature range of 500 to 1000'C is discussed in detail on the basis of elemental analysis, IR, X-ray diffraction and ESR spectra. The results of the analyses show that all the samples appear as black powder, which are insoluble and infusible, and have a wide range of electrical conductivity, X-ray diffraction measurements show all of the peaks are broadened, indicating that these samples are amorphous. The interlayer distances (dc) almost do not vary with an increase in Tp. The crystallite sizes (Lc) are larger than phenol-formaldehyde resins. These results show that all of the samples have slightly aligned crystallites or local molecular orientations which contain four to five fragmental layers stacked on average along the c-axis of each crystallite. Electron spins with a π-nature exist in all the pyrolyzed samples. The ESR linewidth and the spin concentration of the samples vary with TP. The spin concentration becomes maximum and the linewidth is minimum at Tp=600℃.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1991年第11期1551-1554,共4页
Chemical Journal of Chinese Universities
关键词
对甲基
酚醛树脂
热裂解
聚并苯
Para-cresol-formaldehyde resin, Pyrolysis, Polyacene
