CARBONIZATION AND GRAPHITIZATION OF POLYIMIDE FILM NOVAX
CARBONIZATION AND GRAPHITIZATION OF POLYIMIDE FILM NOVAX
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DOI：
10.1016/0008-6223(91)90042-h
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发表时间：
1991-01-01
期刊：
影响因子：
10.9
通讯作者：
HISHIYAMA, Y
中科院分区：
文献类型：
--
作者：
INAGAKI, M;MENG, LJ;HISHIYAMA, Y
聚酰亚胺薄膜“Novax”由酰亚胺部分和两种不同结构的随机混合物的桥接部分组成，在高达1100摄氏度的不同温度下碳化，并在3000摄氏度下石墨化。与其他聚酰亚胺薄膜一样，重量变化分两步进行：在450摄氏度到600摄氏度的狭窄温度范围内，重量大幅下降，在800摄氏度以上进一步下降。前者的减重主要是由于CO和CO_2气体的大量析出，而后者则是由于氮气的析出和电导率的迅速增加，电导率最高可达200 S/cm。最薄的薄膜得到了石墨化程度高、磁电阻值高、各向异性比很低的石墨膜。
Polyimide films "Novax" consisting of the imide part with the bridging part of a random mixture of two different structures, were carbonized at various temperatures up to 1100-degrees-C and graphitized at 3000-degrees-C. The weight change occurred in two steps, as other polyimide films; large weight decrease in a narrow temperature range between 450-degrees and 600-degrees-C, and a further decrease above 800-degrees-C. The former weight decrease could be explained by the evolution of large amount of CO and CO2 gases, and the latter corresponded to the evolution of N2 gas and rapid increase in electrical conductivity up to 200 S/cm. The thinnest film gave a graphite film with a high degree of graphitization, high value of magnetoresistance, and very low anisotropy ratios.