Thermal Transport in Polyethylene: The Effect of Force Fields and Crystallinity

• Published in: Macromolecules Vol. 54; no. 13; pp. 6563 - 6574
• Main Authors: Sæther, Sandra, Falck, Merete, Zhang, Zhiliang, Lervik, Anders, He, Jianying
• Format: Journal Article
• Language: English
• Published: American Chemical Society 13.07.2021
• Subjects: crystal structure; heat transfer; molecular dynamics; polyethylene; thermal conductivity
• ISSN: 0024-9297; 1520-5835; 1520-5835
• DOI: 10.1021/acs.macromol.1c00633

In this article, we study the local structure and heat transfer properties (thermal conductivity and interfacial conductance) in model semi-crystalline polyethylene (PE) by non-equilibrium molecular dynamics. We compare three different force fields with different levels of detail (all-atom, all-atom with constraints, and united-atom) and find that the structure of the model PE is significantly influenced by the choice of force field. The united-atom force field results in a reduced overall crystallinity and an over-idealized organization of the polymer chains, compared to the all-atom force fields. We find that thermal transport properties are not greatly influenced when structural effects are taken into consideration, and our results suggest that united-atom models can be used to study heat transfer properties of model PE, with decreased computational cost.