Physics and chemistry-based constitutive modeling of photo-oxidative aging in semi-crystalline polymers
نویسندگان
چکیده
This paper proposes a physio-chemically-based constitutive framework to simulate and predict the response of semi-crystalline low-density polyethylene (LDPE) severe photo-oxidation. Photo-oxidation induced by exposure Ultra-Violet (UV) light oxygen is dominant degradation mechanism affecting lifespan LDPE. In this work, we propose evolution functions for material properties in equations \cite{boyce2000constitutive} incorporate effects photo-oxidation on mechanical The are based chemically verified processes that responsible degradation, namely change crystallinity mass loss relative initial pristine films over time. Changes characterized Differential Scanning Calorimetry (DSC) Quartz Crystal Microbalance with Dissipation Monitoring (QCM-D) experiments, respectively. Connecting physio-chemical polymer network LDPE bypasses need defining fitting parameters carry no physical meaning. developed validated respect series in-house uniaxial tensile tests performed aged different UV times. Comparison versus experimental also confirms accuracy DSC QCM-D as rigorous techniques monitor characterize films. outcome shed macromolecular under extreme associated properties.
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ژورنال
عنوان ژورنال: International Journal of Solids and Structures
سال: 2022
ISSN: ['1879-2146', '0020-7683']
DOI: https://doi.org/10.1016/j.ijsolstr.2022.111427