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NameMs. Kiana Treaster
EmailEmail hidden; Javascript is required.
OrganizationUniversity of Florida
PositionGraduate Student
InvitedNo
TypePoster
TopicPMSE/POLY
Title

Designing Thermally Conductive Two-Dimensional Polymer Films

Author(s)

Kiana Treaster1, Rupam Roy1, Yuxing Liang2, Shravan Godse2, Ayan Majumdar3, Jonathan Malen2, Pramod Sangi Reddy3, and Austin M. Evans1

Author Location(s)

1 University of Florida, 2 Carnegie Mellon University, 3 University of Michigan

Abstract

The poor thermal conductivity (0.1-0.3 W m-1 K-1) observed in polymers is typically rationalized by the limited thermal transport in amorphous materials held together by weak intermolecular interactions. Recent reports have shown that highly thermally conducting polymers (> 1 W m-1 K‑1) can be achieved by enhancing polymer crystallinity, increasing macromolecular chain alignment, and reinforcing inter-chain non-covalent interactions. However, these findings have not yet driven comprehensive synthetic efforts to expose how different macromolecular features impact thermal conductivity. Here, we synthesize four distinct imine-linked two-dimensional polymer (2DPs) thin films with varying combinations of nodes (tetraphenylamino-pyrene and -perylene) and linkers (terephthaldehyde and biphenyldicarboxyaldehyde) to probe structure-property relationships. This subset of systems allows us to perform pairwise comparisons with the aim of uncovering structure-property design rules for high thermal conductivity polymers. The 2DPs are then post-synthetically modified to transform the imine-linked frameworks to an amide and amine-linked framework to further investigate how different covalent linkages impact anisotropic thermal conductivity. The 2DPs were characterized using infrared spectroscopy, X-ray diffraction, porosimetry, and atomic force microscopy. The cross-plane thermal conductivity (k)  was determined using frequency domain thermoreflectance and the in-plane thermal conductivity (k) was determined using a suspended platform device. 2DP films were successfully synthesized and shown to have a maximum k= 0.20 W m-1 K-1 and k=1.10 W m-1 K-1. After transforming the imine-linked framework to an amide-linked framework, the kincreased to 0.29 W m-1 K-1. These results showcase how structure features reliably impact thermal conductivity in soft matter systems.

 

 

 

 

 

 

Date06/01/2024