Abstract
The thermoreversible gelation of semi-diluted atactic polyacrylnitrile (PAN)/dimethylformamide (DMF)-solutions has been studied. The structural features of PAN/DMF-gels, formed by supercooling have been investigated by DSC-, x-ray- and swelling measurements. A new structural model has been introduced to describe the morphology of the junction zones of PAN/DMF-gels and to also explain the gelation behavior of PAN/DMF-solutions as the structural features of PAN/DMF-gels. The junction zones of a PAN/DMF-gel have been defined as “ordered junction zones”.
A gelation enthalpy of about 〈ΔH〉=−6 kJ/mol supports the idea that an ordered junction zone is formed by intermolecularly neighboring stereoregular parts of atactic PAN chains due to a nucleation process in the solution. It can be defined as a strongly distributed fringed micelle.
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Beckmann, J., Zenke, D. Thermoreversible gelation of polyacrylonitrile/dimethylformamide-solution. Colloid Polym Sci 271, 436–445 (1993). https://doi.org/10.1007/BF00657387
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DOI: https://doi.org/10.1007/BF00657387