Stress cracking is a failure mode that must be considered when evaluating the lifetime of polymer components. In modeling this failure mode, mechanical properties as a function of the extent of degradation must be evaluated. This paper describes an apparatus and method for degrading thin polymer sheets in an oxidative environment. A model system of PE in hot chlorinated water with an oxidation reduction potential of approximately 825 mV is considered. The oxidative environment is achieved by a water bath with temperature, pH and free chlorine controlled to 60-65°C, 5.2 +/- 0.5 ppm free chlorine, and 6.3 +0.5/-0.0 pH. Under these conditions, the molecular weight of 50-60 micron thick PE sheets was reduced by 60% and the strain at break for the sheets was reduced by 90% after 1000 hours exposure.
|Original language||English (US)|
|Title of host publication||75th Annual Technical Conference and Exhibition of the Society of Plastics Engineers, SPE ANTEC Anaheim 2017|
|Publisher||Society of Plastics Engineers|
|Number of pages||6|
|State||Published - 2017|
|Event||75th Annual Technical Conference and Exhibition of the Society of Plastics Engineers, SPE ANTEC Anaheim 2017 - Anaheim, United States|
Duration: May 8 2017 → May 10 2017
|Name||Annual Technical Conference - ANTEC, Conference Proceedings|
|Other||75th Annual Technical Conference and Exhibition of the Society of Plastics Engineers, SPE ANTEC Anaheim 2017|
|Period||5/8/17 → 5/10/17|
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