摘要
用傅里叶变换红外光谱法研究了聚酰亚胺薄膜试样在氮气气氛中自室温至８００℃热解过程中固体残留物的内部结构的转变。根据谱带的变化规律，提出了试样在热解炭化时首先发生亚酰胺环沿Ｃ－Ｎ键断裂，形成具有共轭腈基及异氰基的苯环化合物。异氰基化合物进一步二聚成二苯基碳化二亚胺，后者又聚合生成含氮杂环的多环芳烃。继续热解炭化会导致芳杂环的合并和脱除ＨＣＮ等气态小分子，生成连续巨大的含氮杂芳环多环化合物。再经稠环芳构化最终得到了具有芳环层面结构的大分子固态残留物。
In this paper the changes of the internal structure of polyimide film sample during pyrolytic carbonization from room temperature up to 800C were described under given nitrogen atmosphere by Fourier transform infrared spectroscopy (FTIR). From the variations of the spectral bands it was suggested that the scission of the imide ring along the C-N bond has occured when the sample was carbonized, the compounds of the phenylcycle with the conjugated nitrile group and the isocyanic group were formed As the isocyanic group polymerization progresses, the diphenyl carbodimide may be formed; whereas the latter continuousyl polymerizes, the polycyclic compound of the aromatic heterocycle may be formed Futher continuous carbonization should lead not only to a combining of the heteroaromatic rings,but also to the evolution of the gaseous small molecule of hydrogen cyanide and the formation of the large polycyclic compound of the nitrogen-containing heteroaromatic ring.Again through aromatization of the condenced ring, finally the macromolecular solid residue of the polyaromatic ring plane structure was obtained.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
1996年第6期26-30,共5页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金
关键词
聚酰亚胺薄膜
热解
化学结构
傅里叶变换
Polyimide film, Thermal decomposition, Chemical constitution, FTIR
