钱和生
QIAN He-sheng (Research Center for Analysis and Measurement

• 1:东华大学分析测试中心 上海200051

摘要(Abstract)：

采用裂解气相色谱-质谱技术研究聚醚酰亚胺(PEI)纤维在500℃到750℃温度范围的热分解行为。随温度上升,裂解产物明显增加。在700℃时聚合物分子链断裂完全,鉴别到42种碎片组分。聚醚酰亚胺热分解的碎片中,苯酚、苯胺、氰苯、4-丙烯基二苯醚、4-乙烯基二苯醚、4-甲基二苯醚、二苯醚以及N-苯胺基-异吲哚-1,3(2H)-二酮等8种裂解产物最重要,可以依据这几种化合物定性鉴别聚醚酰亚胺。依据热分解产物的数量以及结构推断降解机理为:聚醚酰亚胺裂解过程中,剪切聚合物分子链,经过剥皮反应连续除去单体单元,再发生消去反应、成环作用、次级反应等形成了一系列裂解碎片。
Pyrolysis of polyether-imide (PEI) fiber has been investigated by pyrolysis gas chromatography-mass spectroscopy in the temperature range from 500 ℃ to 750 ℃. The influence of temperature on its composition of pyrolysates has been observed. As the temperature increases, the compositions of pyrolysate are sharply increased. At 700 ℃, 42 compounds of pyrolysis can be identified. The most important pyrolysis fragment which can be quantitatively identified for polyether-imide are phenol, aniline, benzonitrile, 4-propenyl-diphenyl ether, 4-ethylene-diphenyl ether, 4-methyl-diphenyl ether, diphenyl ether and N-benzo-isoindole-1,3(2H)-dione. The thermal degradation mechanisms which are determined by structure and amount of the thermal decomposition products are described. During pyrolysis of polyether-imide, polymeric chain scissions take place a peeling reaction as a successive removal of the monomer units from the polymeric chain. The chain scissions are followed by the elimination reaction, cyclic action, linkage action and secondary reactions, which lead to a variety of compounds.

关键词(KeyWords)： 聚醚酰亚胺纤维;热分解;气相色谱;质谱
polyether-imide fiber, pyrolysis, gas chromatography, mass spectroscopy

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 钱和生
QIAN He-sheng (Research Center for Analysis and Measurement

参考文献(References)：

• [1]Okamura M.聚醚酰亚胺(PEI)[J].Kogyo Zairyo,1997,45(4):76-80.
• [2]张露,张雯,张凯.热塑性聚醚酰亚胺[J].绝缘材料,2001,38(3):25-28.
• [3]陈桂娥,许振良.聚醚酰亚胺中空纤维气体分离膜及结构[J].膜科学与技术2003,23(5):1-4.
• [4]C Y Feng,K C Khulbe,et al.Structural and performance study of microporous polyetherimide hollow fiber membranes made by solvent-spinning method[J].Journal of Membrane Science,2001,189(2):193-203.
• [5]Elisa Barbosa-Coutinho,Vera M M Salim,et al.Preparation of carbon hollow fiber membranes by pyrolysis of polyetherimide[J].Carbon,2003,41(9):1707-1714.
• [6]Sabrina Carroccio,Concetto Puglisi,Giorgio Montaudo.Photo-oxidation products of polyetherimide ULTEM determined by MALDI-TOF-MS.Kinetics and mechanisms[J].Polymer Degradation and Stability,2003,80(3):459-476.
• [7]Huang Farong,Wang Xueqiu,Li Shijin.The thermal stability of polyetherimide[J].Polymer Degradation and Stability,1987,18(3):247-259.