Mechanical Robust and Conductive Polyurea Nanocomposites Using Graphene Platelets

Abstract

Graphene, renowned for its exceptional surface area, electrical and thermal conductivity, and gas permeation resistance, serves as an excellent filler for enhancing the properties of polyurea (PUA). In this study, graphene platelets (GNPs) were mass-produced via thermal expansion of graphite intercalation compound followed by ultrasonic exfoliation. These GNPs were then incorporated into PUA using a straightforward mixing method to create PUA/GNPs composites. Characterization using SEM and a high resistivity meter revealed strong interfacial bonding between GNPs and the PUA matrix, facilitated by isophorone diisocyanate (IPDI) and Jeffamine D2000 (D2000). This robust interaction significantly improved the composites' performance. Notable enhancements in mechanical properties were observed: tensile strength increased by approximately 79% at 0.5 vol%, impact strength by 15.7% at 0.2 vol%, and tear strength by 30.6% at 0.5 vol%,. These improvements underscore the effectiveness of GNPs as reinforcing fillers, significantly boosting the durability and robustness of the PUA composites. Additionally, the study examined the effect of varying graphene content on the electrical properties of the composites, revealing substantial improvements in electrical conductivity. This research presents a practical strategy for developing high-performance PUA/GNPs composites, leveraging GNP's unique properties to enhance both mechanical and electrical characteristics. The study contributes valuable insights into the synthesis and property enhancement of GNPs nanocomposites, paving the way for further advancements in the field of multifunctional materials.