Polydopamine-Modified Al2O3/Polyurethane Composites with Largely Improved Thermal and Mechanical Properties

Materials

Li He¹  Guizhe Zhao¹  Peng Li¹  Ruikui Du¹ 

[1] North University of China, Taiyuan 030051, China;

关键词: polyurethane;    alumina;    thermal conductivity;    mechanical properties;    in situ polymerization;   

DOI  :  10.3390/ma13071772

来源: DOAJ

【 摘 要 】

Alumina/polyurethane composites were prepared via in situ polymerization and used as thermal interface materials (TIMs). The surface of alumina particles was modified using polydopamine (PDA) and then evaluated via Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG), and Raman spectroscopy (Raman). Scanning electron microscope (SEM) images showed that PDA-Al₂O₃ has better dispersion in a polyurethane (PU) matrix than Al₂O₃. Compared with pure PU, the 30 wt% PDA-Al₂O₃/PU had 95% more Young’s modulus, 128% more tensile strength, and 76% more elongation at break than the pure PU. Dynamic mechanical analysis (DMA) results showed that the storage modulus of the 30 wt% PDA-Al₂O₃/PU composite improved, and the glass transition temperature (Tg) shifted to higher temperatures. The thermal conductivity of the 30 wt% PDA-Al₂O₃/PU composite increased by 138%. Therefore, the results showed that the prepared PDA-coated alumina can simultaneously improve both the mechanical properties and thermal conductivity of PU.

【 授权许可】

Unknown