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Solvent effect on the conformation in solution of two polyimides

✍ Scribed by Joly, C.; Le Cerf, D.; Chappey, C.; Langevin, D.; Muller, G.

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
352 KB
Volume
44
Category
Article
ISSN
0959-8103

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✦ Synopsis

The dilute solution properties of two polyimides have been studied using size exclusion chromatography, light scattering and viscometry in various solvents. Molecular parameters (conformation and aggregation) are found to be solvent dependent. Addition of a non-solvent to 6FDA-mPDA, a Γ‘uorine-(H 2 O) containing polyimide, or Ultem a polyetherimide, in the good solvent N-methyl-2-pyrrolidone is responsible for an increase in molecular weight. This is attributed to aggregation of polyimides in these conditions.

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