A Fast and Room-temperature Self-healing Thermal Conductive Polymer Composite

• Published in: Chinese journal of polymer science Vol. 39; no. 10; pp. 1328 - 1336
• Main Authors: Yue, De-Wei, Wang, Hong-Qin, Tao, Han-Qing, Zheng, Peng, Li, Cheng-Hui, Zuo, Jing-Lin
• Format: Journal Article
• Language: English
• Published: Beijing Chinese Chemical Society and Institute of Chemistry, CAS 01.10.2021; Springer Nature B.V
• Subjects: Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Conducting polymers; Damage; Graphene; Industrial Chemistry/Chemical Engineering; Infrared imaging; Polydimethylsiloxane; Polymer matrix composites; Polymer Sciences; Polymers; Room temperature; Self healing materials; Tensile strength; Thermal conductivity; Thermal imaging; Thermal resistance; Self-healing; Thermal conductive; Infrared thermal imaging
• ISSN: 0256-7679; 1439-6203
• DOI: 10.1007/s10118-021-2620-1

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-CG 10 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-CG 10 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.