Abstract
Thermal conducting materials may be damaged during long-term use, resulting in the increase of thermal resistance and therefore inefficient heat dissipation. The introduction of self-healing ability may solve this problem, but the realization of fast and room-temperature self-healing in thermal conducting composites is quite challenging. Herein, we choose a flexible poly(dimethylsiloxane) polymer material (PDMS-COOH) as the matrix and graphene nanosheets as the thermal conductive filler to prepare a new kind of thermal conductive polymer composite (PDMS-COOH-CG) that can quickly self-heal at room temperature. The thermal conductivity of PDMS-COOH-CG10 with 10% of graphene content is 0.48 W·m−1·K−1, which is 16 times that of PDMS-COOH (0.03 W·m−1·K−1). At room temperature, self-healing efficiency of PDMS-COOH-CG10 based on tensile strength can be 53.8% for 30 s and 84.6% for 24 h. Dynamic infrared thermal imaging dipicted that after 2 min of self-healing at room temperature, the thermal conduction temperature near the damage was basically restored to the level of the pristine sample.
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This work was financially supported by the National Natural Science Foundation of China (Nos. 21631006 and 21771100) and the Fundamental Research Funds for the Central Universities (No. 020514380212).
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Yue, DW., Wang, HQ., Tao, HQ. et al. A Fast and Room-temperature Self-healing Thermal Conductive Polymer Composite. Chin J Polym Sci 39, 1328–1336 (2021). https://doi.org/10.1007/s10118-021-2620-1
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DOI: https://doi.org/10.1007/s10118-021-2620-1