journal article·2023-06-07

Observation of Highly Anisotropic Thermal Expansion of Polymer Films

Settasit Chaikasetsin, Jun Young Jung, Hongdeok Kim, Brian S. Y. Kim, Jungju Seo, Joonmyung Choi, Kiho Bae, Woosung Park

ACS Applied Materials & Interfaces· Volume 15· Issue 22
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Abstract

While dimensional change under thermal loading dictates various device failure mechanisms in soft materials, the interplay between microstructures and thermal expansion remains underexplored. Here, we develop a novel method to directly probe the thermal expansion for nanoscale polymer films using an atomic force microscope as well as confining active thermal volume. In a model system, spin-coated poly(methyl methacrylate), we find that the in-plane thermal expansion is enhanced by 20-fold compared to that along the out-of-plane directions in confined dimensions. Our molecular dynamics simulations show that the collective motion of side groups along backbone chains uniquely drives the enhancement of thermal expansion anisotropy of polymers in the nanoscale limit. This work unveils the intimate role of the microstructure of polymer films on its thermal-mechanical interaction, paving a route to judiciously enhance the reliability in a broad range of thin-film devices.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Thermal properties of materials · Carbon Nanotubes in Composites · Polymer Nanocomposites and Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Mechanical Engineering, Stanford University, Stanford, California 94305, United States

Science Instrumentation Assessment and Application Team, Korea Basic Science Institute, Daejeon 34133, South Korea

Department of Mechanical Design Engineering, Hanyang University, Seoul 04763, Korea

Department of Mechanical Engineering, BK21 FOUR ERICA-ACE Center, Hanyang University, Ansan 15588, Korea

Department of Mechanical Engineering, Columbia University, New York, New York 10027, United States

Department of Energy Engineering, Korea Institute of Energy Technology, Jeonnam, Naju 58217, Korea

Department of Mechanical Engineering, Sogang University, Seoul 04107, Korea

Funding

National Research Foundation of Korea · National Science Foundation

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