Related Experiment Video
Updated: Sep 23, 2025

Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
Published on: September 19, 2020
Designable core-shell graphite particles for thermally conductive and electrically insulating polymer composites
1DuPont Kabushiki Kaisha, Transportation & Advanced Polymers 19-2 Kiyohara Kogyodanchi Utsunomiya-shi Tochigi 321-3231 Japan takashi.hirahara@dupont.com.
Abstract:
Electrically insulating graphite particles were prepared by coating graphite with electrically insulating materials via a two-step mechanical mixing process. Graphite particles were treated with a binder in the 1st mixing process and coated with an electrically insulating particle in the 2nd mixing process under high shear forces within a short processing time (below 1 min). Micron-sized graphite particles were successfully coated with various inorganic particles of appropriate particle diameter. Talc and boron nitride exhibited good affinities with graphite and formed effective coating layers to render reliable electrical insulation. Graphite coated with talc and boron nitride exhibited a high volume resistivity, greater than 109 Ω cm. The insulating property was retained even after compounding and moulding the coated graphite particles with a polymer. The two-step coating process under high shear forces is a promising method for production of coated graphite particles.
Related Concept Videos
Polymers
Network Covalent Solids
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
Polymer Classification: Crystallinity
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Schottky Barrier Diode
Polymer Classification: Architecture
Electrostatic Boundary Conditions in Dielectrics
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's...

