Raman, infra-red and d.s.c. studies of lithium coordination in a thermoplastic polyurethane

• Fourier transform (FT)-Raman and infra-red (i.r.) spectroscopy were utilized to monitor changes in the morphology of a commercial, phase-segregated thermoplastic polyurethane (TPU) as a function of LiClO4 concentration (0.1 to 2.0 mmol/g TPU). Significant changes in both the FT-Raman and the FTi.r. spectra were detected which suggest a competition between hydrogen bonding and lithium cation coordination, especially between the hard segments of the host polymer matrix. A loss in long-range ordering of the hard domain was observed by differential scanning calorimetry with an increase in salt concentration. The ionic conductivity (σ) was found to increase with increasing temperature and salt concentration. For the highest concentration used, σ ranged from a very low value of ∼ 1 x 10-9 S cm-1 at room temperature to ∼ 1 x 10-4 S cm-1 at 130 degrees C.

Ämnesord

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Nyckelord

Fourier transform Raman

FT-Raman

FT-IR

Fourier transform infra-red spectroscopy polyurethane

LiClO4

ionic conductivity

salt concentration

Publikations- och innehållstyp

ref (ämneskategori)

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