A bio-based compatibilizer for improved interfacial compatibility in thermally conductive and electrically insulating graphite/high density poly(ethylene) composites

作者：Zhou, Hua; Ye, Liangdong; Chen, Dongming; Li, Ziwei^*; Li, Shanrong; Li, Dacheng; Huang, Zhiyi^*; Wei, Zhouqiao; Lu, Shaorong^*

来源：JOURNAL OF VINYL & ADDITIVE TECHNOLOGY, 2023, 29(6): 991-1001.

DOI：10.1002/vnl.21977

• compatibilizer
• electrically insulating composites
• HDPE
• oleic acid
• thermally conductive composites
• UV aging

Graphite is a thermally conductive filler. However, when dispersed into high density poly(ethylene) (HDPE) resin, graphite particles tend to agglomerate and requires a compatibilizer to achieve desired thermal/physical properties. In this study, oleic acid (OA), a bio-based additive and polyethylene-polyamines (PEPA) were used to synthesize a new compatibilizer, PEPA-g-OA, containing numerous -NR2 groups. The experimental results showed that PEPA-g-OA can significantly improve the compatibility between graphite particles and the HDPE matrix due to uniform dispersion of graphite in the HDPE matrix. When the graphite content was 25 wt%, the thermal conductivity of the composite recorded 1.2 W m(-1) K-1 (three times that of neat HDPE) and the volume resistivity was 1.8 x 10(9) omega cm, indicating excellent electrical insulation. Compared to the composites with no graphite content, the properties of the composites with 25 wt% graphite content exhibited narrower melting and crystallization peaks, more stable mechanical properties, and higher ultraviolet aging resistance. Synthesized new bio-based compatibilizer and thermally conductive and electrically insulating composites developed in this study can be useful in different industrial fields for the preparation of the next generation composites.

• 单位
  桂林理工大学