Journal
POLYMER BULLETIN
Volume 67, Issue 6, Pages 1073-1089Publisher
SPRINGER
DOI: 10.1007/s00289-011-0525-9
Keywords
Phase diagrams; Fibers; Morphology; Non-solvent; Polyacrylonitrile (PAN)
Categories
Funding
- Science and Technology Commission of Shanghai Municipality [07QA14001]
- National 973 Project [2006CB605302, 2006CB605303]
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In order to investigate the effects of the non-solvent species on the formation mechanism of polyacrylonitrile (PAN) fiber in wet spinning, theoretical ternary phase diagrams of water/DMSO/PAN and ethanol/DMSO/PAN systems were constructed based on the extended Flory-Huggins theory. The cloud-points of dilute PAN solutions of the two systems were determined by titration method and those of concentrated PAN solutions from Boom's linearized cloud-point correlation. Binary interaction parameters were calculated and optimized to construct the theoretical phase diagram. The obtained diagrams were used to investigate the effects of the non-solvent species on the formation of PAN fibers. If the non-solvent water is replaced with ethanol, the meta-stable two-phase region in the ternary phase diagram increases. This favors the de-mixing of the filament via nucleation and growth mechanism during the coagulation process, resulting in homogenous dense PAN fibers with low porosity.
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