Molecular dynamics simulations of ultrathin PMMA films
نویسندگان
چکیده
The mechanical properties of an ultrathin film made from a thermoplastic differ the bulk due to presence free surface. Here, molecular dynamics simulations are used explore thickness dependence uniaxial and equi-biaxial tensile responses polymethyl methacrylate (PMMA) films. sensitivity deformation response temperature, weight degree side-branching is determined. We find that failure strain decreases with decreasing thickness, weight. plays secondary role in dictating response. Failure by initiation voids at surface, followed expansion direction. Recent solid−state nanofoaming experiments models suggest attainable porosity nanofoams less than macro−scale foams reduced ductility cell walls nanofoam. Our results provide physical explanation for this observation.
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ژورنال
عنوان ژورنال: Polymer
سال: 2021
ISSN: ['1873-2291', '0032-3861']
DOI: https://doi.org/10.1016/j.polymer.2021.123748