Temperatures of secondary relaxation transitions of binary polymer blends processed by supercritical carbon dioxide

 L.R. Abdrazakova*, D.I. Kamalova**

Kazan Federal University, Kazan, 420008 Russia

E-mail: *Dina.Kamalova@kpfu.ru, **leysan342@gmail.com

Received November 27, 2017

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Abstract

We have used FTIR spectroscopy of conformationally inhomogeneous probes to study the influence of supercritical carbon dioxide on the local molecular dynamics in the blends of polyvinyl butyral and polyethylene glycol with the following compositions: 80:20, 60:40, 40:60, and 20:80. The temperatures of secondary relaxation transitions in these blends after the processing by supercritical carbon dioxide have been determined.

Keywords: supercritical carbon dioxide, secondary relaxation transitions, polymer blend

Acknowledgments. We are grateful to Professor F.M. Gumerov (Kazan National Research Technological University) for processing of polymer blends by supercritical carbon dioxide.

Figure Captions

Fig. 1. FTIR spectra of the polymer PVB and PEG blends before sc-CO₂ processing for the following compositions: 80:20 (a), 60:40 (b), 40:60 (c), and 20:80 (d) at room temperature.

Fig. 2. FTIR spectra of the polymer PVB and PEG blends after sc-CO₂ processing for the following compositions: 80:20 (a), 60:40 (b), 40:60 (c), and 20:80 (d) at room temperature.

Fig. 3. FTIR spectrum fragments of the TBE probe in PVB + PEG mixture (80:20) after sc-CO₂ processing at the following temperatures: 298 K (a), 201 K (b), and 103 K (c).

 Fig. 4. ln (D_trans / D_gauche) dependence on 1/T for the EDC probe in PVB + PEG mixtures after sc-CO₂ processing for the following compositions: 80:20 (a), 60:40 (b), 40:60 (c), and 20:80 (d).

 Fig. 5. ln (D_trans / D_gauche) dependence on 1/T for the TCE probe in PVB + PEG mixtures after sc-CO₂ processing for the following compositions: 80:20 (a), 60:40 (b), 40:60 (c), and 20:80 (d).

  Fig. 6. ln (D_trans / D_gauche) dependence on 1/T for the TBE probe in PVB + PEG mixtures after sc-CO₂ processing for the following compositions: 80:20 (a), 60:40 (b), 40:60 (c), and 20:80 (d).

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For  citation: Abdrazakova L.R., Kamalova D.I. Temperatures of secondary relaxation transitions of binary polymer blends processed by supercritical carbon dioxide. Uchenye Zapiski Kazanskogo Universiteta. Seriya Fiziko-Matematicheskie Nauki, 2018, vol. 160, no. 1, pp. 42–50. (In Russian)

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