Thermally responsive particles of poly(benzimidazobenzophenanthroline) modified with poly(N-isopropylacrylamide)

Sami-Pekka Hirvonen, Teemu Rossi, Mikko Karesoja, Erno Karjalainen, Heikki Tenhu (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)

Abstract

Poly(benzimidazobenzophenanthroline) (BBL) chain ends were substituted with a well-known thermally responsive polymer poly(N-isopropylacrylamide). The resulting polymers showed superior colloidal stability in aq. dispersions compared to previously reported poly(ethylene oxide) substituted BBL, and in one case, particles were found to be colloidally stable up to 900 mM NaCl concn. The typical lower crit. soln. temp. (LCST) behavior of poly(N-isopropylacrylamide) (PNIPAm) in water was partially lost due to the harsh conditions of the chain end substitution reaction but adjusting the pH or ionic strength facilitated thermally induced phase sepn. of the dispersed polymer particles. After cooling to ambient temp., the particles could be re-dispersed and their colloidal stability was regained.
Original languageEnglish
Pages (from-to)2957-2965
Number of pages9
JournalColloid and Polymer Science
Volume293
Issue number10
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

Keywords

  • Critical solution temperature (lower
  • thermally responsive particles of poly(benzimidazobenzophenanthroline) modified with poly(N-isopropylacrylamide))
  • Polybenzimidazoles Role: PRP (Properties)
  • SPN (Synthetic preparation)
  • PREP (Preparation) (polyamide-
  • Polyamides Role: PRP (Properties)
  • PREP (Preparation) (polybenzimidazole-
  • Colloids (stability
  • Dispersion of materials
  • Molecular weight
  • Phase separation
  • Semiconductor materials
  • Size distributions
  • Thermal stability (thermally responsive particles of poly(benzimidazobenzophenanthroline) modified with poly(N-isopropylacrylamide))
  • polybenzimidazobenzophenanthroline
  • aq
  • dispersion
  • polyisopropylacrylamide
  • modification
  • thermal
  • responsiveness

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