Physical ageing of polystyrene: does tacticity play a role?

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Abstract

The ageing kinetics of amorphous atactic (a-PS), isotactic (i-PS), and syndiotactic (s-PS) polystyrene were studied by means of flash-differential scanning calorimetry. The specimens were aged for up to 2 h at six different ageing temperatures: the optimum ageing temperature, that is, the temperature at which the enthalpy overshoot at the glass transition is maximal for the given elapsed time, and five ageing temperatures ranging from 20 to 80 K below the optimum ageing temperature. A logarithmic increase of the enthalpy overshoot with ageing time is observed for specimens at their optimum ageing temperatures. For temperatures significantly lower than the optimum, there is a range where the enthalpy overshoot is constant, but for higher temperatures (still below the optimum), a logarithmic increase is also observed. Moreover, the ageing kinetics appear to depend on tacticity, with s-PS and i-PS exhibiting the slowest and fastest ageing kinetics, respectively, and a-PS exhibiting ageing kinetics between these two extremes.
Original languageEnglish
Pages (from-to)5948-5954
Number of pages7
JournalMacromolecules
Volume52
Issue number15
DOIs
Publication statusPublished - 13 Aug 2019

Fingerprint

Polystyrenes
Aging of materials
Enthalpy
Temperature
Kinetics
Glass transition
Differential scanning calorimetry

Keywords

  • Physical ageing
  • Polystyrene
  • Tacticity
  • Flash-DSC

Cite this

@article{ee364bd5aae84e1db3be123311537562,
title = "Physical ageing of polystyrene: does tacticity play a role?",
abstract = "The ageing kinetics of amorphous atactic (a-PS), isotactic (i-PS), and syndiotactic (s-PS) polystyrene were studied by means of flash-differential scanning calorimetry. The specimens were aged for up to 2 h at six different ageing temperatures: the optimum ageing temperature, that is, the temperature at which the enthalpy overshoot at the glass transition is maximal for the given elapsed time, and five ageing temperatures ranging from 20 to 80 K below the optimum ageing temperature. A logarithmic increase of the enthalpy overshoot with ageing time is observed for specimens at their optimum ageing temperatures. For temperatures significantly lower than the optimum, there is a range where the enthalpy overshoot is constant, but for higher temperatures (still below the optimum), a logarithmic increase is also observed. Moreover, the ageing kinetics appear to depend on tacticity, with s-PS and i-PS exhibiting the slowest and fastest ageing kinetics, respectively, and a-PS exhibiting ageing kinetics between these two extremes.",
keywords = "Physical ageing, Polystyrene, Tacticity, Flash-DSC",
author = "Kalouda Grigoriadi and J.B.H.M. Westrik and Georgios Vogiatzis and {van Breemen}, Lambert and Patrick Anderson and Markus H{\"u}tter",
year = "2019",
month = "8",
day = "13",
doi = "10.1021/acs.macromol.9b01042",
language = "English",
volume = "52",
pages = "5948--5954",
journal = "Macromolecules",
issn = "0024-9297",
publisher = "American Chemical Society",
number = "15",

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Physical ageing of polystyrene: does tacticity play a role? / Grigoriadi, Kalouda; Westrik, J.B.H.M.; Vogiatzis, Georgios; van Breemen, Lambert; Anderson, Patrick; Hütter, Markus (Corresponding author).

In: Macromolecules, Vol. 52, No. 15, 13.08.2019, p. 5948-5954.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Grigoriadi, Kalouda

AU - Westrik, J.B.H.M.

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AU - Anderson, Patrick

AU - Hütter, Markus

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N2 - The ageing kinetics of amorphous atactic (a-PS), isotactic (i-PS), and syndiotactic (s-PS) polystyrene were studied by means of flash-differential scanning calorimetry. The specimens were aged for up to 2 h at six different ageing temperatures: the optimum ageing temperature, that is, the temperature at which the enthalpy overshoot at the glass transition is maximal for the given elapsed time, and five ageing temperatures ranging from 20 to 80 K below the optimum ageing temperature. A logarithmic increase of the enthalpy overshoot with ageing time is observed for specimens at their optimum ageing temperatures. For temperatures significantly lower than the optimum, there is a range where the enthalpy overshoot is constant, but for higher temperatures (still below the optimum), a logarithmic increase is also observed. Moreover, the ageing kinetics appear to depend on tacticity, with s-PS and i-PS exhibiting the slowest and fastest ageing kinetics, respectively, and a-PS exhibiting ageing kinetics between these two extremes.

AB - The ageing kinetics of amorphous atactic (a-PS), isotactic (i-PS), and syndiotactic (s-PS) polystyrene were studied by means of flash-differential scanning calorimetry. The specimens were aged for up to 2 h at six different ageing temperatures: the optimum ageing temperature, that is, the temperature at which the enthalpy overshoot at the glass transition is maximal for the given elapsed time, and five ageing temperatures ranging from 20 to 80 K below the optimum ageing temperature. A logarithmic increase of the enthalpy overshoot with ageing time is observed for specimens at their optimum ageing temperatures. For temperatures significantly lower than the optimum, there is a range where the enthalpy overshoot is constant, but for higher temperatures (still below the optimum), a logarithmic increase is also observed. Moreover, the ageing kinetics appear to depend on tacticity, with s-PS and i-PS exhibiting the slowest and fastest ageing kinetics, respectively, and a-PS exhibiting ageing kinetics between these two extremes.

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