Influence of Hydrophobic Anion on Solution Properties of PDMAEMA.

Erno Karjalainen, Vladimir Aseyev, Heikki Tenhu (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

62 Citations (Scopus)


The effect of bis(trifluoromethane)sulfonimide, NTf2, anion on soln. properties of the thermoresponsive poly(2-(dimethylamino)ethyl methacrylate), PDMAEMA, has been studied. Nonstoichiometric amts. of LiNTf2 were added to aq. solns. of PDMAEMA, with or without a buffer in the pH range 6-10. Since PDMAEMA is a weak polybase, the interaction between PDMAEMA and NTf2 can be manipulated by the concn. of the anion and also by varying the degree of charging of PDMAEMA with pH. PDMAEMA has a well-known LCST behavior which can be modulated by the counterion. It was obsd. that the hydrophobic NTf2 anion not only decreases the cloud point of PDMAEMA but also triggers an upper crit. soln. temp. (UCST) type behavior in acidic pH. In a higher pH regime, NTf2 makes the cloud point increase because the anion turns PDMAEMA to a stronger base, presumably by effectively shielding the charges. [on SciFinder(R)]
Original languageEnglish
Pages (from-to)2103-2111
Number of pages9
Issue number6
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed


  • Polymerization (atom transfer
  • radical
  • influence of hydrophobic anion on soln. properties of PDMAEMA)
  • Hydrophobicity
  • Optical transmission
  • Solubility (influence of hydrophobic anion on soln. properties of PDMAEMA)
  • Critical solution temperature (upper
  • hydrophobic
  • anion
  • soln


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