碳纤维 ENGLISH.pptVIP

The preperation and applications of PAN-based carbon fiber New words and expressions PAN-based carbon fiber 聚丙烯腈基碳纤维 mesophase [mes?ufeiz] 中间相 epoxy [ipɑksi] adj. 环氧的 resin[r?z?n] n.树脂 polyamide[p?li?maid] n. 聚酰胺 magnesium [m?gnizirm] n.镁 polyacrylonitrile [p?li?kr?lo?naitril] 聚丙烯腈 precuresor [pri:k?:rs?(r)] n.前驱体 原丝 preoxidation [pri:?ksidei??n] n.预氧化 pendant [p?nd?nt] n.项链，侧基 nitrile [naitr?l] adj. 腈基的 Contents Part 1. Introduction Part 2. Preperation of PAN-based carbon fiber Part 3. Mechanical properties Part 4. Applications of carbon fiber Part 1. Introduction Carbon fiber is a new breed of high strength material. Although initially developed for aerospace industry and for military aircraft , they are now finding wide applications in commercial and civilian aircraft , recreational , industrial , and transportation markets. They have low density and the highest strength among all currently available engineering materials. They are used in composites with a light weight matrix, generally an epoxy resin, occasionally polyamide, and now frequently carbon, aluminum, magnesium ect al. We generally obtained carbon fibers from polyacrylonitrile(PAN) fiber, pitch fiber and cellulosic fiber. PAN-based carbon fiber is recognised as most important and promising precuresor for the present manufacture of carbon fibers. AN,IA,MA Carbon fiber PAN polymer Precusor Stabilized fiber spinning oxidation 230~300℃ carbonization 300~1600℃ Part 2. Preperation of PAN-based carbon fiber Flow diagram of fabrication of PAN-based carbon fiber polymerization PAN fibers are made by free-radical polymerization, either in solution or in a solvent-water suspension. The polymer is then dried and redissolved in another solvent for spinning. The first critical step making carbon fiber named preoxidation is caus