High-Performance Carbon Fiber Manufacturing Improve And XRD Analysis Polyacrylonitrile During Pre-Oxidation

In this paper, through the PAN precursor production process of analysis, PAN-based carbon fiber production processes and production equipment has been improved and Advanced. Designed in line with the actual use of related equipment, and draw simple Schematics. Production process in which precursor of the major improvements include: Purification of acrylonitrile copolymer components of the process of adopting a more high-power heating equipment and the volume of containers distillation, Make a deal with a significant increase in the volume of raw materials not only reduce the intensity of work, but also ensures that the quality of raw materials, improve the stability and experimental reproducibility are very good role; In order to prevent the occurrence of explosive polymerization reaction process designed for the three-tier response to different reactions in different phases in the reactor, we can guarantee the continuity of the response, Polyacrylonitrile spinning solution from a single process using high-performance defoaming rotary film evaporator to improve the efficiency and quality of spinning liquid; In the washing process, in order to reduce the friction between the roller designed micro-fiber wash resistance boxes, both to ensure that the washing effect, but also to reduce friction and reduce the emergence of wool yarn or the possibility of broken wires; Drafting high-pressure steam vapor pressure of the need to ensure that it does in the draft steam setting machine sealed at both ends of the valve, to ensure the existence of pressure.This article is also the use of statistical mechanics of sub-cluster AN of in the process of analysis of XRD data, the obtained activation energy, the use of XRD for different pre-oxidation temperature and time of PAN under the pre-oxide were studied. The results show that, with the pre-oxidation time and temperature increase, due to-CN interaction, reflecting the linear structure of 16.5o and 29o of the peak gradually weakened or disappeared, and reflect the cyclic structure of the peak is 25.5o Department gradually increased, and this is the-CN groups to reflect the role of cyclization. The use of peak area with temperature and time on-CN cyclization quantitative study showed that in the range of 250～300℃, the higher the pre-oxidation temperature, the more easily into a reaction, the higher degree of cyclization. Pre-oxidation reaction process of the activation energy is central 63.57KJ/mol, cyclization reaction is not dominant, ring structure and the coexistence of linear structure, and further high-temperature carbonization, can be substantial increase in the proportion of ring structure.