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Flexible high dielectric polystyrene/ethylene-α-octene copolymer/graphene nanocomposites: Tuning the morphology and dielectric properties by graphene's surface polarity

Goodarzi, M ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1002/pat.5569
  3. Publisher: John Wiley and Sons Ltd , 2022
  4. Abstract:
  5. The current research focuses on suggesting a new potential application of polymeric materials for capacitor applications by focusing on polystyrene (PS)/ethylene-α-octene copolymer (EOC) blends. Polymeric materials have high dielectric strength (≈ 200 for PS), good processability, and flexibility. However, their low dielectric constants make them not suitable for capacitor applications. Therefore, suggesting a method for enhancing their dielectric constant accompanied by low tan δ proposes an excellent substitute for commonly used ceramic dielectrics. The current article investigates the control of the dielectric properties of PS/EOC blends by manipulating the graphene nanoplatelets (GNPs) surface polarity. Results confirm that the localization site of the GNPs is mainly controlled by their surface polarities; this matter leads to the change of the morphology from sea/island for the pure blend to co-continuous for the blend containing the most polar GNPs resulting in the best dielectric properties. This manipulation of the morphology by low concentration of GNPs (1.5 wt%) and therefore, dielectric properties result in high dielectric constant ≈ 55.8 at 10 MHz and low tan δ = 0.007, accompanied by high flexibility, which is the main drawback of ceramic capacitors, makes it a fantastic option for capacitor applications. © 2022 John Wiley & Sons Ltd
  6. Keywords:
  7. Dielectric materials ; Dielectric properties ; Graphene ; Morphology ; Polymeric materials ; 'current ; Copolymer blends ; Dielectric strengths ; Dielectrics property ; Graphene nanocomposites ; Graphene nanoplatelets ; High dielectrics ; Research focus ; Surface polarities ; Tan δ ; Polystyrenes
  8. Source: Polymers for Advanced Technologies ; Volume 33, Issue 3 , 2022 , Pages 937-951 ; 10427147 (ISSN)
  9. URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/pat.5569