A new deterministic model for tree growth in polymers with barriers

Farr, T.; Vogelsang, R.; Fröhlich, K.

doi:10.1109/ceidp.2001.963635

Cited by 23 publications

(14 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…along the barrier rather than along the film surface normal. [13][14][15][16][17] Evidence of interfacial propagation of trees due to barrier effect was observed by Vogelsang et.al in epoxy systems with mica barriers. 17 Wolak et.al observed breakdown damage and layer delamination a few microns away from the position of the top electrode in the cross-sections of co-extruded multilayered films; effects not observed in single component films, thus suggesting interfacial phenomena.…”

Section: Morphology Of Bcp Filmsmentioning

confidence: 79%

Directed Self-Assembly of Block Copolymers for High Breakdown Strength Polymer Film Capacitors

Samant

Grabowski

Kisslinger

et al. 2016

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Emerging needs for fast charge/discharge yet high-power, lightweight, and flexible electronics requires the use of polymer-film-based solid-state capacitors with high energy densities. Fast charge/discharge rates of film capacitors on the order of microseconds are not achievable with slower charging conventional batteries, supercapacitors and related hybrid technologies. However, the current energy densities of polymer film capacitors fall short of rising demand, and could be significantly enhanced by increasing the breakdown strength (EBD) and dielectric permittivity (εr) of the polymer films. Co-extruded two-homopolymer component multilayered films have demonstrated much promise in this regard showing higher EBD over that of component polymers. Multilayered films can also help incorporate functional features besides energy storage, such as enhanced optical, mechanical, thermal and barrier properties. In this work, we report accomplishing multilayer, multicomponent block copolymer dielectric films (BCDF) with soft-shear driven highly oriented self-assembled lamellar diblock copolymers (BCP) as a novel application of this important class of self-assembling materials. Results of a model PS-b-PMMA system show ∼50% enhancement in EBD of self-assembled multilayer lamellar BCP films compared to unordered as-cast films, indicating that the breakdown is highly sensitive to the nanostructure of the BCP. The enhancement in EBD is attributed to the "barrier effect", where the multiple interfaces between the lamellae block components act as barriers to the dielectric breakdown through the film. The increase in EBD corresponds to more than doubling the energy storage capacity using a straightforward directed self-assembly strategy. This approach opens a new nanomaterial paradigm for designing high energy density dielectric materials.

show abstract

Section: Morphology Of Bcp Filmsmentioning

confidence: 79%

Directed Self-Assembly of Block Copolymers for High Breakdown Strength Polymer Film Capacitors

Samant

Grabowski

Kisslinger

et al. 2016

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…In this model, it is considered that the tree structure grows discretely and the propagation probability in a given direction depends on the magnitude of the local electric field strength raised to a power η , that allows controlling the fractal dimension of the tree structure. This model has been used for various studies such as statistical and probabilistic analyses [ 28 , 29 , 30 ], the evaluation of the effect of dielectric barriers [ 5 , 31 ] or the space charge on tree propagation [ 3 ], and tree propagation in inhomogeneous media or including space charge [ 25 ]. The main disadvantages of this model are that the power η does not have a physical relationship with the tree propagation phenomenon and the time is not included as a physical variable in the model.…”

Section: Brief Review Of Current Models For Simulating the Propagamentioning

confidence: 99%

An Improved Physical-Stochastic Model for Simulating Electrical Tree Propagation in Solid Polymeric Dielectrics

2020

View full text Add to dashboard Cite

The dielectric breakdown of solid polymeric materials is due to the inception and propagation of electrical trees inside them. The remaining useful life of the solid dielectrics could be determined using propagation simulations correlated with non-intrusive measurements such as partial discharges (PD). This paper presents a brief review of the different models for simulating electrical tree propagation in solid dielectrics. A novel improved physical-stochastic model is proposed, which allows quantitatively and qualitatively analyzing the electrical tree propagation process in polymeric dielectrics. Simulation results exhibit good agreement with measurements presented in the literature. It is concluded that the model allows adequately predicting the tree propagation behavior and additional experimental analyses are required in order to improve the model accuracy.

show abstract

“…The applied voltage in test-(b) is lower than the tree inception voltage. Therefore, it is considered that electrical treeing of the base epoxy resin is comparatively straight (14) . However, electrical treeing with many branches is observed in both Nano-composite with silane treatment 0.81 9.0 x 10 -4 (9.2%) b) 7.3 x 10 -9…”

Section: Estimate Of Treeing and Crack Propagation In Nano-mentioning

confidence: 99%

Effects of Epoxy/Filler Interface on Properties of Nano- or Micro-composites

et al. 2006

View full text Add to dashboard Cite

This paper focuses on the effects of the interface between epoxy resin and nano-or micro-scale silica filler. Experiments were carried out on epoxy resin containing nano-or micro-scale silica fillers (nano-composite or micro-composite) to investigate the effects of the epoxy/filler interface on the properties of water absorption, electrical insulation and fracture toughness. The results indicated that epoxy/silica filler interface has an impact on the properties of the nano-and micro-composites. Nano-composites were shown to have higher water absorption than micro-composites because water accumulated over a larger interface area. Moreover, the nano-composites with interfaces treated with a silane coupling agent showed insulation breakdown properties and fracture toughness superior to those of the base epoxy resin and the micro-composites. The chemical bonding by the silane coupling agent at the epoxy/nano-scale silica filler interface played a more important role in water absorption and insulation breakdown properties than for the micro-scale silica filler. The filler size reduction to nano-scale needs appropriate interface treatment because of its tremendously large interface area. In addition, belt-shaped area models demonstrated the improvement of insulation breakdown properties and fracture toughness from the viewpoint of encountering frequency between electrical treeing or initial cracking and fillers. It is assumed that an increase in encountering frequency prevents treeing or cracking from propagating efficiently and thus improves insulation breakdown properties and fracture toughness in the nano-composite.

show abstract

A new deterministic model for tree growth in polymers with barriers

Cited by 23 publications

References 5 publications

Directed Self-Assembly of Block Copolymers for High Breakdown Strength Polymer Film Capacitors

Directed Self-Assembly of Block Copolymers for High Breakdown Strength Polymer Film Capacitors

An Improved Physical-Stochastic Model for Simulating Electrical Tree Propagation in Solid Polymeric Dielectrics

Effects of Epoxy/Filler Interface on Properties of Nano- or Micro-composites

Contact Info

Product

Resources

About