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Order-disorder transitions in self-assembled polymers: A positron annihilation study

Ramani, R., Valkama, S., Kilpeläinen, S., Tumisto, F., Brinke, G. T., Ruokolainen, J., Alam, S. & Ikkala, O., 2009, In : Physica Status Solidi C. 6, 11, p. 2414-2416 3 p.

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  • Ramasubbu Ramani
  • Sami Valkama
  • Simo Kilpeläinen
  • Filip Tumisto
  • Gerrit ten Brinke
  • Janne Ruokolainen
  • Sarfaraz Alam
  • Olli Ikkala
We report here the first results of order-disorder transition (ODT) in a self-assembled comb-like polymer-amphiphile supramolecular system as identified from the change in positron lifetime parameters. We have used poly(4-vinyl pyridine) hydrogen bonded with 3-pentadecyl phenol, which upon heating showed a stepwise reduction in o-Ps intensity at the ODT from lamellar self-assembled state to the disordered state. The ODT temperature was confirmed by differential scanning calorimetry and small angle X-ray scattering. The free volume “holes” in this polymer-amphiphile system are proposed to be near the chain ends of the polymer backbones. We suggest that positron lifetime spectroscopy can serve as a technique to identify ODTs in self-assembled lamellar structured supramolecular systems.
Original languageEnglish
Pages (from-to)2414-2416
Number of pages3
JournalPhysica Status Solidi C
Volume6
Issue number11
Publication statusPublished - 2009

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