Abstract
Abstract The rheological properties of PAN/DMSO solution and the size and distribution of PAN coils were studied by rheology and dynamic light scattering (DLS) measurements. It was found that water could be used as a gel accelerator and increase the gel transition temperature T gel and the storage modulus G′ as well as decrease the damping factor tan δ through rheological measurements. DLS test shows that the average size of PAN coils increases significantly with the increase in gel accelerator content. In addition, the gel accelerator can change the mobility of PAN chains during the cooling process. The results show that the gel accelerator can enhance the entanglement of PAN macromolecular chains and improve the formation of three-dimensional network gel structure, so that PAN solution is more prone to gel transition during the cooling process.
Highlights
IntroductionGel spinning was developed with the production of high quality PAN precursor for the manufacturing
In recent years, gel spinning was developed with the production of high quality PAN precursor for the manufacturingIn this study, the mechanism of gel accelerator on the gelation of PAN solution was studied by rheology and dynamic light scattering (DLS) methods
The strain amplitude should be set in the range of linear viscoelastic (LVE) region to ensure the maintenance of sample structure, which was set at 1% in this study
Summary
Gel spinning was developed with the production of high quality PAN precursor for the manufacturing. The mechanism of gel accelerator on the gelation of PAN solution was studied by rheology and dynamic light scattering (DLS) methods. The effect of gel accelerator was investigated from the perspectives of both the rheological properties and the size of PAN random coils in the spinning solution. The relationship between the formation of three-dimension gel structure and the morphology of PAN chains would be confirmed
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