广东纺织职业技术学院：《纺织材料学》课程教学资源（PPT课件，英文版）6 High Performance Fibers and Fibrous Materials（NXPowerLite）

广东费飘职业故本学院 Guangdong Inatitute of Textile Technology High Performance Fibers and Fibrous materials

High Performance Fibers and Fibrous materials

广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Outline 口 Carbon fibers 口 Glass fibers 口 Aramid fibers a Ultra High Modulus polyethylene fibers 口 Carbon nanotubes 口 Ceramic fibers O Mechanical properties of fibers

Outline  Carbon fibers  Glass fibers  Aramid fibers  Ultra High Modulus Polyethylene fibers  Carbon nanotubes  Ceramic fibers  Mechanical properties of fibers

广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Carbon fibers 口 Reading assignment a Hull and clyne chapter 2 Fibres and Matrices an introduction to Composite Materials, 2nd ed. Cambridge University press. Pages 9 -30

Carbon fibers  Reading assignment  Hull and Clyne, Chapter 2 Fibres and Matrices, An Introduction to Composite Materials, 2nd ed. Cambridge University Press. Pages 9 –30

广东费飘职业故本学院 Guangdong Inatitute of Textile Technology carbon fibers a Manufacturing processes a Structure and properties

Carbon fibers  Manufacturing processes  Structure and properties

广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Carbon fibers Manufacturing processes a Thermal decomposition of fibrous organIc precursors 日 Extrusion of pitch

Carbon fibers ◼ Manufacturing processes  Thermal decomposition of fibrous organic precursors  Extrusion of pitch

广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Carbon fiber manufacturing processes Rayon based carbon fibers Stabilization at 400 c in o depolymerization aromatization Carbonization at 400-700 c in an inert atmosphere Stretch and graphitization at 700- 2800C(improve orientation and increase crystallinity by 30-50%)

Carbon fiber manufacturing processes ◼ Rayon based carbon fibers Stabilization at 400°C in O2 , depolymerization & aromatization Carbonization at 400-700°C in an inert atmosphere Stretch and graphitization at 700- 2800°C (improve orientation and increase crystallinity by 30-50%)

广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Carbon fiber manufacturing processes PaiN (pOlyaryiontrile)based carbon fibers 口 Pan fibers Stabilization at 200-300C in O2u depolymerization aromatization converting thermoplastic Pan to a nonplastic cyclic or ladder compound Carbonization at 1000-1500 c in an inert atmosphere to get rid of noncarbon elements Stretch and graphitization at >1800 C formation of turbostratic structure

Carbon fiber manufacturing processes ◼ PAN (polyarylonitrile) based carbon fibers  PAN fibers Stabilization at 200-300°C in O2 , depolymerization & aromatization, converting thermoplastic PAN to a nonplastic cyclic or ladder compound Carbonization at 1000-1500°C in an inert atmosphere to get rid of noncarbon elements Stretch and graphitization at >1800°C, formation of turbostratic structure

广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Stabilization of pan fibers Figure 2 Intermolecular interaction of nitrile groups. 人

Stabilization of PAN fibers

广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Pitch based carbon fibers. a pitch- high molecular weight byproduct of distillation of petroleum heated >350 c condensation reaction formation of mesophase(liquid crystal: Structure of mesophase pitch melt spinning into pitch fibers Oxidation at a temperature below softening temperature conversion into graphite fibers at 2000 C without tension

Pitch based carbon fibers  pitch - high molecular weight byproduct of distillation of petroleum ◼ heated >350°C, condensation reaction, formation of mesophase (Liquid crystal): Structure of mesophase pitch melt spinning into pitch fibers Oxidation at a temperature below softening temperature conversion into graphite fibers at ~2000°C without tension

广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Pitch based carbon fibers ■ Advantages a Much higher degree of graphitization than polymer based carbon fibers a High strength and modulus O High thermal conductivity: even much better than copper

Pitch based carbon fibers ◼ Advantages  Much higher degree of graphitization than polymer based carbon fibers  High strength and modulus  High thermal conductivity: even much better than copper