This review provides a detailed overview on the latest developments in the design and control of the interface in polymer based composite dielectrics for energy storage applications. The methods employed for interface design in composite systems are described for a variety of filler types and morphologies, along with novel approaches employed to build hierarchical interfaces for multi-scale control of properties. Efforts to achieve a close control of interfacial properties and geometry are then described, which includes the creation of either flexible or rigid polymer interfaces, the use of liquid crystals and developing ceramic and carbon-based interfaces with tailored electrical properties. The impact of the variety of interface structures on composite polarization and energy storage capability are described, along with an overview of existing models to understand the polarization mechanisms and quantitatively assess the potential benefits of different structures for energy storage. The applications and properties of such interface-controlled materials are then explored, along with an overview of existing challenges and practical limitations. Finally, a summary and future perspectives are provided to highlight future directions of research in this growing and important area.

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Interface design for high energy density polymer nanocomposites

2D filler-reinforced polymer nanocomposite dielectrics for high-k dielectric and energy storage applications

Effect of carbon nanotubes on the interface evolution and dielectric properties of polylactic acid/ethylene–vinyl acetate copolymer nanocomposites

Polymer nanocomposites with enhanced performances are becoming a trend in the current research field, overcoming the limitations of bulk polymer and meeting the demands of market and society in tribological applications. Polytetrafluoroethylene, poly(ether ether ketone) and ultrahigh molecular weight polyethylene are the most popular polymers in recent research on tribology. Current work comprehensively reviews recent advancements of polymer nanocomposites in tribology. The influence of different types of nanofiller, such as carbon-based nanofiller, silicon-based nanofiller, metal oxide nanofiller and hybrid nanofiller, on the tribological performance of thermoplastic and thermoset nanocomposites is discussed. Since the tribological properties of polymer nanocomposites are not intrinsic but are dependent on sliding conditions, direct comparison between different types of nanofiller or the same nanofiller of different morphologies and structures is not feasible. Friction and wear rate are normalized to indicate relative improvement by different fillers. Emphasis is given to the effect of nanofiller content and surface modification of nanofillers on friction, wear resistance, wear mechanism and transfer film formation of its nanocomposites. Limitations from the previous works are addressed and future research on tribology of polymer nanocomposites is proposed.

Effect of Nanofillers on Tribological Properties of Polymer Nanocomposites: A Review on Recent Development.

Investigation of the electroactive phase content and dielectric behaviour of mechanically stretched PVDF-GO and PVDF-rGO composites

https://onlinelibrary.wiley.com/doi/pdf/10.1002/adv.21956

Energy storage and loss capacity of graphene-reinforced poly(vinylidene fluoride) nanocomposites from electrical and dielectric properties perspective: A review

Polymer/graphene nanocomposites (PGNs) have shown great potential as dielectric and energy storage materials. However, insolubility of graphene in most solvents, hydrophobic behaviour and poor disp...

Enhanced dielectric performance and energy storage density of polymer/graphene nanocomposites prepared by dual fabrication:

Graphene nanoplatelets (GNPs) were mechanically insulated with titanium dioxide (TD) nanopowder to address challenges of high dielectric loss and low breakdown strength associated with polymer/graphene nanocomposites. GNPs were functionalized (fGNPs) and TD was hydroxylated (TD-OH) to ensure wettability of the co-particles and well dispersion in polymer matrix. The composite samples were developed by solution blending and melting compounding processes. Successful modification of the co-particles and insulation of fGNPs were examined using Fourier transform infrared (FTIR), X-ray diffractometer (XRD), transmission electron microscope (TEM) and scanning electron microscope (SEM). Energy storage capacity, dielectric and electrical properties of the composites were investigated. Insulated fGNPs composites showed significant improvement in energy storage capacity and reduction in dielectric loss with addition of 10 wt % TD-OH compared to bared fGNPs composites. About 92.6% reduction in dielectric loss and 77% increase in energy storage density were recorded for 6.67 wt % fGNPs/10 wt % TD-OH composite compared to 6.67 wt % fGNPs composite at 100Hz. This was due to excellent insulating property of TD-OH on fGNPs. Although dielectric loss was further reduced on addition of 20 wt % TD-OH into fGNPs composites, their dielectric constant and energy storage density were slightly reduced compared to composites containing 10 wt % TD-OH. This study revealed that mechanical insulation of graphene with ceramic nanopowder can suppress energy dissipation associated with polymer/graphene nanocomposites with improve energy storage capacity.

Mechanically Insulated Graphene/Polymer Nanocomposites with Improved Dielectric Performance and Energy Storage Capacity

Polymeric materials have become useful in advancing technology due to their distinct properties. One of the useful applications of polymeric materials is in optical conditions such as fibre core, cladding and jacketing of optical fibre. However, polymers suffer from poor thermal properties, which limit their applications in high-temperature environments. Polymers show different properties at various temperatures with respect to time or duration of exposure. In most cases, they show high deterioration of properties at elevated temperature. This often limits the use of polymer in optical application at some certain elevated temperature. Notwithstanding, there has been an advancement on improving thermal stability of polymers as optical fibre materials. Therefore, discussion in this review focused on polymers as cladding and coating materials for high-temperature applications. This review summarized polymeric cladding materials, behaviours and properties of polymeric cladding materials under high temperature. It was concluded with advancements, challenges and recommendations for high-temperature polymeric cladding materials. It is believed that this review will give insight into advancement and selection of high-temperature polymeric materials for cladding, jacketing and coating applications. It will also give a platform for further research.

Polymeric cladding materials under high temperature from optical fibre perspective: a review

In most engineering applications where fluid lubrication is practically impossible such as high temperature environment, solid lubrication becomes an alternative option. Polymers such as polytetraf...

U. O. Uyor

Papers

Energy storage and loss capacity of graphene-reinforced poly(vinylidene fluoride) nanocomposites from electrical and dielectric properties perspective: A review

Enhanced dielectric performance and energy storage density of polymer/graphene nanocomposites prepared by dual fabrication:

Mechanically Insulated Graphene/Polymer Nanocomposites with Improved Dielectric Performance and Energy Storage Capacity

Polymeric cladding materials under high temperature from optical fibre perspective: a review

Effects of titania on tribological and thermal properties of polymer/graphene nanocomposites: