Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 42, Pages 29080-29087Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b10451
Keywords
polymer composites; crystal network; thermal conductivity; transparent; phonon
Funding
- American Chemical Society [55570-DNI10]
- Swedish Kempe Scholarship Project [JCK-1507]
- University of Akron
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Phonon transfer is greatly scattered in traditional polymer composites due to the unpaired phonon frequency at the polymer/filler interface. A key innovation of this work is to build continuous crystal network by self-organization and utilize it as thermal highway that circumvents the long-existing interfacial thermal barrier issue in traditional composites. By tuning the molecular diffusion rate of dicarboxylic acids (oxalic acid, malonic acid, and succinic acid), different crystal structures including skeletal, dendrite, diffusion-limited aggregates, and spherulite were synthesized in PVA film. These continuous crystal structures benefit the efficient phonon transfer in the composites with minimized interfacial scattering and lead to a significant thermal conductivity enhancement of up to 180% compared to that of pure polymer. Moreover, the transparent feature of these composite films provides additional benefits in display applications. The post heat treatment effect on the thermal conductivity of the composite films shows a time-dependent behavior. These uniquely structured polymer/crystal composites are expected to generate significant impacts in thermal management applications.
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