Lipophilic ionomers with bulky ion-pairs and effect of counterion on miscibility of the ionomer blends

Masahiko Ohta, Toshikazu Ono, Kenta Kokado, Akira Kakugo, Kazuki Sada

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


In this study, polystyrene (PS) ionomers having tetraalkylammonium with a series of counterions are prepared with various feed ratio of the ionic units and blended with nonionic poly(n-butyl methacrylate) (PBMA) which is originally immiscible with PS. According to differential scanning calorimetry analysis, in the blends of ionomers with tetraarylborate and PBMA, the ionomers with more than 1 mol% of the ionic units are completely miscible with PBMA. Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction measurements reveal that the bulky and lipophilic ion-pair inhibits the association of ions and instead induces the attractive interaction to alkyl groups of PBMA. Tensile tests of the miscible specimen exhibit both characteristic behavior, that is, high tensile strength as PS and high elongation property of PBMA. Employment of lipophilic ion-pair as a compatibilizing component is produced for homogeneous polymer blends consisting of polystyrene (PS) and poly(n-butyl methacryrate) (PBMA). The lipophilic ion-pair is tethered on the PS chain and only 1 mol% introduction is adequate to obtain the homogeneous polymer blends. The obtained polymer blends show combined characteristics, thus high tensile strength of PS and high elongation property of PBMA.

Original languageEnglish
Pages (from-to)433-444
Number of pages12
JournalMacromolecular Chemistry and Physics
Issue number3
Publication statusPublished - Feb 1 2016

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry


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