摘要
聚丙烯腈（ＰＡＮ）基碳纤维是一种高性能的结构材料、其工艺过程包括三个阶段：预氧化，碳化和石墨化，其中预氧化是关键。本文应用裂解气相色谱（ＰＧＣ）法对Ａ，Ｂ两种ＰＡＮ基碳纤维预氧化过程中组成和结构的演变进行了研究，找出了最佳裂解色谱条件，并对预氧化阶段纤维组成和结构的演变规律进行了探讨。预氧化可分为初期、中期和后期。预氧化初期和中期，首先由氧引发环化，生成含氧杂环；接着发生氰基环化，同时伴随着脱氢的氧化。预氧化后期，随着氰基的消失，形成一种稳定的框架结构。这种框架结构在碳化过程中无大变化。预氧化初期和中期反应剧烈，需要在工艺过程中加强控制。
Polyacrylonitrile (PAN)carbon fiber is a kind of high performance stuctural mateterial .The PAN-base fibers inversion fibers involves the follwing pro-cessing steps:stabilization,carbonization and graphitization.And stabiliaztion is a critizal step .In this paper the evolution of composition and structure os two types of PAN-base carbon fibers A and B during stabilization was studied by pyrolysis -gas chromatography (PGC),The optimum, PGC conditons were obtained and the laws of evolu-tion of composition and strure were discussed.The stabilization can be divided into initial stage,middle stage and latter stage.During the initial stage and middle stage,cycization is induced by oxygen to form oxy-hetercoycles.Then nitrille groups cyclized.meanwhile,dehydrogenation adn oxidation take place.During the latter stage,a stable skeleton structure forms with nitrile groups disappearing.Thw skeleton structuredoesn't change very much during carbonization .The chemical reaction are very vio-lent during initial stagend middle stage:therfore,careful control is needed during preparation.
出处
《钢铁研究学报》
CAS
CSCD
北大核心
1994年第S1期81-91,共11页
Journal of Iron and Steel Research
