Self-Healing High Strength and Thermal Conductivity
of 3D Graphene/PDMS Composites by the Optimization of Multiple Molecular
Interactions
Posted on 2020-07-21 - 14:06
Thermally
conductive, robust, but self-healable polymer/carbon
nanocomposites are the research focus in functional materials. However,
the trade-off between molecular interaction and cross-linking makes
it difficult to simultaneously achieve excellent self-healing, high
strength, and thermal conduction. Herein, we fabricated boroxine poly(dimethylsiloxane)
2-ureido-4[1H]-pyrimidinone selectively cross-linked
by molecular boron ester bonds and hydrogen bonds. By optimizing the
reversible interaction, a maximum strength of 7.33 MPa and a high
self-healing efficiency of 97.69 ± 0.33% were achieved at a boroxine-to-2-ureido-4[1H]-pyrimidinone molar ratio of 1:3 (BE-PDMS1:3-UPy). Highly robust composites of BE-PDMS1:3-UPy were
obtained using a UPy-modified graphene aerogel. A transected sample
recovered its mechanical properties (78.83 ± 2.40%) and thermal
conductivity (98.27 ± 0.13%) after self-healing at 40 °C
for 6 h. The outstanding reversible association/disassociation of
hydrogen bonds at the polymer–graphene interface makes the
composites to be used as structure–function integrated materials
in interfacial thermal conductors.
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Yu, Huitao; Feng, Yiyu; Gao, Long; Chen, Can; Zhang, Zhixing; Feng, Wei (2020). Self-Healing High Strength and Thermal Conductivity
of 3D Graphene/PDMS Composites by the Optimization of Multiple Molecular
Interactions. ACS Publications. Collection. https://doi.org/10.1021/acs.macromol.9b02544
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