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Study on the Inter Relationship of Polyacrylonitrile Precursor to Improvement of Technology on the Steam Drafting

Author: ZuoYouZhi
Tutor: PanDing
School: Donghua University
Course: Polymer Chemistry and Physics
Keywords: precursor PAN drawing manufacturabilityShe Youzhi (Major: Polymer Chemistry and Physics) Supervised by Professor Pan Ding
CLC: TQ342.31
Type: Master's thesis
Year: 2010
Downloads: 115
Quote: 1
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Abstract


PAN fiber is the key precursor of the high-performance carbon fiber preparation,which has a significant impact on carbon fiber.The PAN precursor’s low quality is the bottleneck that hinders the development of carbon fiber in China.Therefore,research on the relationship between PAN filament spinning process and the fiber properties has great significance for improving and enhancing the performance of the carbon fibers.Because the macromolecular structure of the primary fiber is lack of directional orientation, then its strength is very low.For improving the fiber strength,we need increase its orientation by drawing.The effect of single drafting is limited which could not achieve the mechanical requirement.Therefore,we must use two or multi-level drawing.Drafting the fiber by saturated steam is one of the key technologies to improve the performance of the precursor.However,the technology of this field in our country has many defects,which resulted in the occurrence of broken fiber.In this paper,X-ray diffraction,scanning electron microscopy,sound velocity method,and single-tow stretch were employed to test experimental precursors’ strength,breaking elongation, density,boiling water shrinkage,the degree of crystallinity and orientation,and grain size,etc. Intensive research was carried out on the drafting under the saturated steam’s effect on the structure and performance of the PAN.The results showed that the mechanical properties of precursor are best when the vapor pressure is 5 kg/cm~2 and the pressure difference between two different domains in the of drawing tube is 2kg/cm~2.The crystallinity degree of the precursor was obtained from X-ray diffraction.With the increasing of draw ratio,the crystal space is not changed.The sound velocity method and X-ray diffraction measurement showed that the degree of orientation increased with the growth of tensility.The research on the change rate of fiber boiling water shrinkage indicated that fiber stress was related to the drawing of the multiple and temperature.The proper control of the drawing tension and humidity can increase the fiber mechanical properties.The comparative picture of scanning electron microscope showed that two-one-type saturated steam drawing device can obtain the precursor with uniform diameter,smooth surface and clear groove,as well as a more optimized micro-architecture.The results of the comparison with three stretching modes showed that two-one-type precursor had more superior structure performances.It improved the existing process of PAN precursor production and created proper experiment conditions for the high-performance carbon fiber precursor preparation.

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CLC: > Industrial Technology > Chemical Industry > The chemical fiber industry > Synthetic fiber > Polyacrylonitrile Department of fibers > Polyacrylonitrile fibers ( acrylic )
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