Effect of low-temperature physical aging on the dynamic transitions of atactic polystyrene in the glassy state

Kalouda Grigoriadi; Tristan Putzeys; Michael Wübbenhorst; Lambert van Breemen; Patrick Anderson; Markus Hütter

doi:10.1002/polb.24883

Effect of low-temperature physical aging on the dynamic transitions of atactic polystyrene in the glassy state

Kalouda Grigoriadi, Tristan Putzeys, Michael Wübbenhorst, Lambert van Breemen, Patrick Anderson, Markus Hütter (Corresponding author)

Polymer Technology

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Abstract

The local and cooperative dynamics of atactic PS (a-PS) were studied by broadband dielectric relaxation spectroscopy (BDRS) and attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR). The a-PS has been subjected to thermal rejuvenation and subsequent quenching, short-term aging (6 weeks), and long-term aging (1 year) at ambient conditions. Where for the rejuvenated sample only an α- and a γ-relaxation is observed, short-term aging results in an additional β*-relaxation that merges with the α-relaxation at longer aging times. The γ-relaxation is increasing in intensity and activation energy during aging. The α-process shows no spectral changes and shift in the relaxation time upon aging. This may be attributed to a possible erasure of history of the material during the temperature-sweep mode measurement. Fourier transform infrared spectroscopy (FTIR) results suggest that the energetically favorable trans-trans (tt) conformers are increased in population with aging.

Original language	English
Pages (from-to)	1394-1401
Number of pages	8
Journal	Journal of Polymer Science, Part B: Polymer Physics
Volume	57
Issue number	20
DOIs	https://doi.org/10.1002/polb.24883
Publication status	Published - 15 Oct 2019

Keywords

physical ageing
glassy polymers
atactic polystyrene
ageing
amorphous
polystyrene
dielectric properties
FT-IR
annealing
molecular dynamics
atactic

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Grigoriadi, K., Putzeys, T., Wübbenhorst, M., van Breemen, L., Anderson, P., & Hütter, M. (2019). Effect of low-temperature physical aging on the dynamic transitions of atactic polystyrene in the glassy state. Journal of Polymer Science, Part B: Polymer Physics, 57(20), 1394-1401. https://doi.org/10.1002/polb.24883

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abstract = "The local and cooperative dynamics of atactic PS (a-PS) were studied by broadband dielectric relaxation spectroscopy (BDRS) and attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR). The a-PS has been subjected to thermal rejuvenation and subsequent quenching, short-term aging (6 weeks), and long-term aging (1 year) at ambient conditions. Where for the rejuvenated sample only an α- and a γ-relaxation is observed, short-term aging results in an additional β*-relaxation that merges with the α-relaxation at longer aging times. The γ-relaxation is increasing in intensity and activation energy during aging. The α-process shows no spectral changes and shift in the relaxation time upon aging. This may be attributed to a possible erasure of history of the material during the temperature-sweep mode measurement. Fourier transform infrared spectroscopy (FTIR) results suggest that the energetically favorable trans-trans (tt) conformers are increased in population with aging.",

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Effect of low-temperature physical aging on the dynamic transitions of atactic polystyrene in the glassy state. / Grigoriadi, Kalouda; Putzeys, Tristan; Wübbenhorst, Michael; van Breemen, Lambert ; Anderson, Patrick ; Hütter, Markus (Corresponding author).

In: Journal of Polymer Science, Part B: Polymer Physics, Vol. 57, No. 20, 15.10.2019, p. 1394-1401.

Research output: Contribution to journal › Article › Academic › peer-review

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