Journal
MACROMOLECULES
Volume 53, Issue 16, Pages 7161-7170Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.9b02544
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Funding
- National Outstanding Youth Talent Program (2019)
- State Key Program of National Natural Science Foundation of China [51633007]
- Natural Science Foundation of Tianjin [18JCYBJC95500]
- Natural Science Foundation for Distinguished Young Scholars in Tianjin [19JCJQJC61700]
- National Natural Science Foundation of China [51773147, 51803151, 51973152]
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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]-pyrimidi-none 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 degrees 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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