Melt-spinning Of Hollow Fibers From Mesophase Pitch

Carbon fibers have many properties-high intensity, high stiffness, low density, high temperature resistant and so on. Carbon fiber composites have been widely used in aerospace, military affairs, modern industry and so on. It has important meaning.1. The composition and structure of AR mesophase pitch were studied by the means of elemental analysis, FT-IR, polarized light microscope with hot-stage and so on. Based analysis on the reports, AR mesophase pitch was thought as the best material for producing the pitch-based carbon fibers. Mesophase pitch was melt-spun into hollow mesophase pitch-based fibers from C spinneretter. The main affecting factors such as temperature, pressure and drawing velocity on properties of fibers in melt-spun were systemic investigated. As a result, AR mesophase pitch have good spinnability, and low temperature、low pressure and high rotate speed gave fiber good comfiguration. After optimized choosing, we got pitch fibers which have50%degree of profile under356℃,0.04MPa,750r/min. The cross section of carbon fiber was onionskin by scanning microscope.2. Mesophase pitch was melt-spun into hollow mesophase pitch-based fibers from Y spinneretter under high temperature and high pressure. We speculated the possibility of forming process and explain the phenomena. We think that it will be a great useful technique in the process of hollow fibers.3. Pitch fibers were treated in different the stabilization temperature and tensility. We found that the stabilization temperature and tensility are critica factor to the mechanical properties of mesophase pitch-based carbon fibers. After being treated in270℃,20g tension, Carbon fiber got maximal intensity which was2.07Gpa. Compared with solid carbon fiber which has similar diameters, it increased by11.9%.