Highly Enhancing Electrical, Thermal, and Mechanical Properties of Polypropylene/Graphite Intercalation Compound Composites by In Situ Expansion during Melt Mixing

Polymers

Hui He¹  Haichen Zhang²  Manfeng Hu³  Haichu Chen³  Wei Li³  Zhifeng Wang³  Jun Tong³ 

[1] School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China;School of Materials Science and Hydrogen Energy, Foshan University, Foshan 528000, China;School of Mechatronic Engineering and Automation, Foshan University, Foshan 528000, China;

关键词: polymer matrix composites (PMCs);    electrical properties;    thermal properties;    mechanical properties;   

DOI  :  10.3390/polym13183095

来源: DOAJ

【 摘 要 】

Polypropylene/graphite intercalation compound (PP/GIC) composites are prepared via melt mixing at three different temperatures (180, 200, and 220 °C). The dispersion of GICs in the composites is clearly improved due to the increased interlamellar spacing caused by in situ expansion of GICs at higher temperatures, which facilitates the intercalation of PP molecular chains into the GIC galleries. As a result, the PP/GIC composite with 10 wt% GICs prepared at 220 °C (PG220) presents a dielectric constant of about 1.3 × 10⁸ at 10³ Hz, which is about six orders higher than that of the composite prepared at 180 °C (PG180). Moreover, the thermal conductivity of the PG220 sample (0.63 Wm⁻¹K⁻¹) is 61.5% higher than that of the PG180 sample. The well-dispersed GICs accelerates the crystallization of PP by increasing the nucleation point and enhances the thermal stability of the composites. The PG220 sample shows a Young’s modulus that is about 21.2% higher than that of the PG180 samples. The results provide an efficient approach for fabricating polymer/GIC composites without complex exfoliation and dispersion processes.

【 授权许可】

Unknown