Polymer Dynamics: Bulk and Nanoconfined Polymers

Sasaki, Takashi

doi:10.3390/polym14071271

Polymers

2022

DOI: 10.3390/polym14071271

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Polymer Dynamics: Bulk and Nanoconfined Polymers

Takashi Sasaki

Abstract: The dynamics in polymeric systems affect various important properties including mechanical and thermal behaviors, and extensive studies in this field have been executed not only academically but also practically [...]

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Crystallization of Flexible Chains of Tangent Hard Spheres under Full Confinement

et al. 2022

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We present results from extensive Monte Carlo simulations on the crystallization of athermal polymers under full confinement. Polymers are represented as freely jointed chains of tangent hard spheres of uniform size. Confinement is applied through the presence of flat, parallel, and impenetrable walls in all dimensions. We analyze crystallization as the summation of two contributions: one that occurs in the bulk volume of the system (bulk crystallization), and one on the wall surfaces (surface crystallization). Depending on volume fraction initially amorphous (disordered) hard-sphere chain packings transit to the stable crystal phase. The established ordered morphologies consist primarily of hexagonal close-packed (HCP) crystals in the bulk volume and of triangular (TRI) crystals on the surface. As in the case of athermal packings in the bulk (without confinement), a structural competition is observed between the 5-fold local symmetry and the formation of close-packed crystallites. Effectively, the full confinement inside a cube favors the growth of the HCP crystal, as the FCC one is quite incompatible with the imposed spatial constraints. Consequently, we observe the formation of noncompact ordered motifs which grow from the surface to the inner volume of the simulation cell. We further compare the 2D and 3D crystals formed by monomeric hard spheres under the same simulation conditions. Significant differences are observed at low densities that tend to diminish as concentration increases.

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Crystallization of Flexible Chains of Tangent Hard Spheres under Full Confinement

et al. 2022

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Polymer Dynamics: Bulk and Nanoconfined Polymers

Abstract: The dynamics in polymeric systems affect various important properties including mechanical and thermal behaviors, and extensive studies in this field have been executed not only academically but also practically [...]

Cited by 1 publication

References 16 publications

Crystallization of Flexible Chains of Tangent Hard Spheres under Full Confinement

Crystallization of Flexible Chains of Tangent Hard Spheres under Full Confinement

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