Degradation and accelerated ageing of poly(ether block amide) thermoplastic elastomers

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Unstabilized poly(ether block amide) (PEBA, PEBAX) of the type used in angioplasty balloons was aged at temperatures of 18–85°C for periods of up to 313 days. Since PEBA is used in safety critical applications, understanding the effects and underlying mechanisms of ageing and the validity of accelerated ageing protocols is vital. Mechanical testing indicated an increase in modulus during ageing consistent with embrittlement. An activation energy (Ea) of 47.3 kJ mol−1 was calculated over the temperature range 18–45°C and increased deviation from linear Arrhenius behavior observed above 45°C. This value of Ea would result in the commonly applied 10°C rule over estimating shelf life. Fourier Transform Infrared Spectroscopy, Gel Permeation Chromatography, and thermal analysis provided evidence that the observed property changes were largely the result of oxidative damage and crystallinity effects. The data presented provides a rational basis for the use of accelerated testing protocols at temperatures of up to 45°C to generate room temperature shelf life estimates.
LanguageEnglish
Pages2203-2209
JournalPolymer Engineering and Science
Volume51
Issue number11
DOIs
Publication statusPublished - 13 May 2011

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ether
degradation
temperature
crystallinity
FTIR spectroscopy
activation energy
chromatography
gel
safety
damage
effect
protocol

Cite this

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title = "Degradation and accelerated ageing of poly(ether block amide) thermoplastic elastomers",
abstract = "Unstabilized poly(ether block amide) (PEBA, PEBAX) of the type used in angioplasty balloons was aged at temperatures of 18–85°C for periods of up to 313 days. Since PEBA is used in safety critical applications, understanding the effects and underlying mechanisms of ageing and the validity of accelerated ageing protocols is vital. Mechanical testing indicated an increase in modulus during ageing consistent with embrittlement. An activation energy (Ea) of 47.3 kJ mol−1 was calculated over the temperature range 18–45°C and increased deviation from linear Arrhenius behavior observed above 45°C. This value of Ea would result in the commonly applied 10°C rule over estimating shelf life. Fourier Transform Infrared Spectroscopy, Gel Permeation Chromatography, and thermal analysis provided evidence that the observed property changes were largely the result of oxidative damage and crystallinity effects. The data presented provides a rational basis for the use of accelerated testing protocols at temperatures of up to 45°C to generate room temperature shelf life estimates.",
author = "D Dixon and A Boyd",
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Degradation and accelerated ageing of poly(ether block amide) thermoplastic elastomers. / Dixon, D; Boyd, A.

In: Polymer Engineering and Science, Vol. 51, No. 11, 13.05.2011, p. 2203-2209.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Degradation and accelerated ageing of poly(ether block amide) thermoplastic elastomers

AU - Dixon, D

AU - Boyd, A

PY - 2011/5/13

Y1 - 2011/5/13

N2 - Unstabilized poly(ether block amide) (PEBA, PEBAX) of the type used in angioplasty balloons was aged at temperatures of 18–85°C for periods of up to 313 days. Since PEBA is used in safety critical applications, understanding the effects and underlying mechanisms of ageing and the validity of accelerated ageing protocols is vital. Mechanical testing indicated an increase in modulus during ageing consistent with embrittlement. An activation energy (Ea) of 47.3 kJ mol−1 was calculated over the temperature range 18–45°C and increased deviation from linear Arrhenius behavior observed above 45°C. This value of Ea would result in the commonly applied 10°C rule over estimating shelf life. Fourier Transform Infrared Spectroscopy, Gel Permeation Chromatography, and thermal analysis provided evidence that the observed property changes were largely the result of oxidative damage and crystallinity effects. The data presented provides a rational basis for the use of accelerated testing protocols at temperatures of up to 45°C to generate room temperature shelf life estimates.

AB - Unstabilized poly(ether block amide) (PEBA, PEBAX) of the type used in angioplasty balloons was aged at temperatures of 18–85°C for periods of up to 313 days. Since PEBA is used in safety critical applications, understanding the effects and underlying mechanisms of ageing and the validity of accelerated ageing protocols is vital. Mechanical testing indicated an increase in modulus during ageing consistent with embrittlement. An activation energy (Ea) of 47.3 kJ mol−1 was calculated over the temperature range 18–45°C and increased deviation from linear Arrhenius behavior observed above 45°C. This value of Ea would result in the commonly applied 10°C rule over estimating shelf life. Fourier Transform Infrared Spectroscopy, Gel Permeation Chromatography, and thermal analysis provided evidence that the observed property changes were largely the result of oxidative damage and crystallinity effects. The data presented provides a rational basis for the use of accelerated testing protocols at temperatures of up to 45°C to generate room temperature shelf life estimates.

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