Phase behavior of a weakly interacting block copolymer by temperature-dependent FTIR spectroscopy

Hye Jeong Kim, Seung Bin Kim, Jin Kon Kim, Young Mee Jung, Du Yeol Ryu, Kristopher A. Lavery, Thomas P. Russell

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


The phase transitions of polystyrene-block-poly(n-pentyl methacrylate) (PS-PnPMA) have been investigated by temperature-dependent infrared spectroscopy with two-dimensional correlation spectroscopy. PS-PnPMA was shown to exhibit a closed-loop type of phase behavior, where, upon heating, a disorder-to-order transition (LDOT) was found at lower temperature and an upper order-to-disorder transition (UODT) was observed at higher temperature. Sudden changes in the absorbance (A) and maxima in the slope dA/dT were observed at the transition temperatures. In the disordered state below the LDOT, the intensity of the conformational band at 1255 cm -1 was greater than that at 1274 cm -1, whereas the reverse was found in the disordered state above the UODT. This suggests that the conformation of the C-C-O group in the PnPMA chain (and thus the directional enthalpic gain) is different in the two disordered states and, therefore, that the driving force to induce the disordered state at lower temperatures is different from that at higher temperatures.

Original languageEnglish
Pages (from-to)408-412
Number of pages5
Issue number1
Publication statusPublished - 2006 Jan 10

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry


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