Colloidal properties and gelation of aqueous dispersions of conductive poly(benzimidazobenzophenanthroline) derivatives

Sami-Pekka Hirvonen, Mikko Karesoja, Erno Karjalainen, Sami Hietala, Pasi Laurinmäki, Eevakaisa Vesanen, Sarah J. Butcher, Heikki Tenhu (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

Poly(benzimidazobenzophenanthroline), BBL, is a practically insol. conductive polymer. It can be gradually dispersed in water, however by dialysis and sonication, i.e. during the purifn. and diln. right after synthesis. Dispersions with higher solids content and colloidal stability were prepd. by first turning the polymer amphiphilic adding poly(ethylene oxide), PEO, into BBL chain ends (BBL-PEO). Dynamic light scattering and zeta potential measurements showed that the dispersions consist of neg.-charged particles with a broad size distribution. These dispersions were found to be sensitive to ionic strength. Salting out occurred within a NaCl concn. range of 0.5-4 mM and some samples showed re-entrant behavior with redispersion upon further salt addn. Addn. of a non-ionic surfactant was found to enhance the stability of BBL-PEO dispersions against salting-out. Upon increasing the polymer concn. the dispersions form gels upon resting. The strength of the gels depends on the total polymer concn. as well as the proportions of BBL and PEO in the BBL-PEOs. The gel formation was attributed to a formation of a network of nano-wire-type aggregates, which was verified with electron cryo-microscopy. [on SciFinder(R)]
Original languageEnglish
Pages (from-to)694-701
JournalPolymer
Volume54
Issue number2
DOIs
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed

Keywords

  • Polyoxyalkylenes Role: PRP (Properties)
  • SPN (Synthetic preparation)
  • PREP (Preparation) (block
  • polypyrrones
  • colloidal properties and gelation of aq. dispersions of conductive poly(benzimidazobenzophenanthroline) derivs.)
  • Aggregation
  • Colloids
  • Conducting polymers
  • Gelation
  • Ionic strength
  • Nanowires
  • Shear
  • Viscosity (colloidal properties and gelation of aq. dispersions of conductive poly(benzimidazobenzophenanthroline) derivs.)
  • Ladder polymers Role: PRP (Properties)
  • RCT (Reactant)
  • PREP (Preparation)
  • RACT (Reactant or reagent) (colloidal properties and gelation of aq. dispersions of conductive poly(benzimidazobenzophenanthroline) derivs.)
  • Polypyrrones Role: PRP (Properties)
  • PREP (Preparation) (colloidal properties and gelation of aq. dispersions of conductive poly(benzimidazobenzophenanthroline) derivs.)
  • Stability (colloidal
  • Surfactants (nonionic
  • colloidal
  • aq
  • dispersion
  • conductive
  • polybenzimidazobenzophenanthroline
  • deriv
  • polypyrrone
  • polyoxyalkylene
  • block
  • prepn

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