On Thermal Acceleration of Medical Device Polymer Aging

An empirical rule, the 10 °C rule, states that chemical reaction rates are doubled for every 10 °C temperature increase. This is often used in thermally accelerated medical device polymer aging studies. Here, theoretical evidence and limitations for the rule are analyzed. Thus, a new and more accura...

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Bibliographic Details
Published in:IEEE transactions on device and materials reliability 2019-06, Vol.19 (2), p.313-321
Main Authors: Janting, Jakob, Theander, Julie Grundtvig, Egesborg, Henrik
Format: Magazinearticle
Language:English
Subjects:
10 °C rule analysis
Accelerated aging tests
Accelerated tests
Acceleration
activation energies
Activation energy
Aging
Chemical reactions
Chemicals
Empirical analysis
Materials reliability
Medical devices
Medical electronics
Medical equipment
Organic chemistry
polymer degradation
Polymers
Temperature
Temperature dependence
thermal acceleration
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Summary:An empirical rule, the 10 °C rule, states that chemical reaction rates are doubled for every 10 °C temperature increase. This is often used in thermally accelerated medical device polymer aging studies. Here, theoretical evidence and limitations for the rule are analyzed. Thus, a new and more accurate rule based on averaging Arrhenius chemical reaction rate ratios over typical activation energies 0.1 eV-0.9 eV in the normal medical device accelerated test temperature interval 25 °C-70 °C is proposed. A comparison of the 10 °C rule shows that the 10 °C rule provides similar estimates, but only at the reference temperature 25 °C. Fitting the reaction rate ratio based on the Arrhenius equation using the reference temperature 25 °C to the 10 °C rule data reveals that the best agreement is achieved with thermal aging activation energy of 0.67 eV.
ISSN:1530-4388
1558-2574
DOI:10.1109/TDMR.2019.2907080