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Title: The spinning of hollow polyacrylonitrile fibres as a precursor for the formation of hollow carbon fibres
Author: Thewlis, Richard M.
Awarding Body: University of Strathclyde
Current Institution: University of Strathclyde
Date of Award: 1998
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Hollow polyacrylonitrile (PAN) fibres were prepared as a precursor for hollow carbon fibres. The fibres were dry-jet wet spun from a DMF solution using water or a 50/50:water/DMF mixture as the coagulant both externally and internally. The effect of the spinning conditions on the fibre wall morphology and tensile properties was investigated by scanning electron microscopy and tensile testing and the knowledge gained from the early experiments was used to develop a pilot plant scale spinning rig. The rheological properties of the spinning solutions were investigated using steady shear flow rheometry, oscillatory rheometry and extensional rheometry, and the molecular weight of the PAN was determined using dilute solution rheometry. A simple model was proposed for the prediction of fibre diameters from the spinning conditions. This model was later used to predict the spinning conditions required to generate fibres of the target dimensions which were 25µm external diameter and 15µm internal diameter. The target dimensions were almost achieved but work was performed that showed that after carbonisation the fibres would have the required dimensions.
Supervisor: Ferguson, J. ; Hudson, Nicholas Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral