Morphological and rheological insights on polyimide chain entanglements for electrospinning produced fibers

Stefan Chisca, Andreea Irina Barzic*, Ion Sava, Niculae Olaru, Maria Bruma

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Solution rheology and electrospinning performance of an aromatic polyimide based on 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (BTDA) and 3,3′-dimethyl-4,4′-diaminodiphenylmethane (MMDA) was studied. Analyzing the dependence of specific viscosity on polymer concentration enabled the evaluation of the transition from semidilute unentangled to semidilute entangled regime at 18.3%. Modification of chain interactions in solution is also reflected in a sudden increase of flow energetic barrier and consistency index values from 3.56 to 10.28 kJ/mol and 0.19 to 1.09 Pa·sn, respectively. In the concentration domain of 15-20% the relaxation time is enhanced from 0.48 to 1.07 s, as a consequence of less chain mobility, which can be associated with the elastic character of the polyimide solution, useful for obtaining fibers. Scanning electron microscopy (SEM) and polarized light microscopy (PLM) images indicate that at 25% beaded fibers are obtained, while at 30% bead-free fibers are formed having the diameter comprised between 0.56 and 0.85 μm.

Original languageEnglish (US)
Pages (from-to)9082-9088
Number of pages7
JournalJournal of Physical Chemistry B
Volume116
Issue number30
DOIs
StatePublished - Aug 2 2012

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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