5 results about "Polymer dielectrics" patented technology

This utility model relates to the field of electronic paper display technology, specifically to a plasma display module with a polymer dielectric coating, comprising: a first substrate and a second substrate, the second substrate being disposed opposite to the first substrate, forming a plasma display cavity between the first and second substrates, the plasma display cavity being filled with plasma particles; a pixel electrode layer is disposed on the surface of the second substrate facing the first substrate, a filter layer is disposed on the surface of the first substrate facing the second substrate, and a conductive dielectric layer is disposed on the surface of the filter layer facing the second substrate; a polymer dielectric coating is disposed on the surface of the conductive dielectric layer facing the second substrate or the surface of the pixel electrode layer facing the first substrate. The polymer dielectric coating in this utility model possesses the characteristics of strong vertical conductivity and weak horizontal conductivity, which can effectively reduce the oblique electric field and help particles move orderly between the upper and lower substrates, thereby eliminating image retention.

This invention relates to the field of polymer dielectric materials and discloses a cyclic olefin copolymer / anthracene composite dielectric film for high-temperature energy storage, comprising 100 parts by weight of a cyclic olefin copolymer and 0.2 to 1.0 parts by weight of anthracene. The anthracene is uniformly dispersed in the amorphous network interstices of the cyclic olefin copolymer, utilizing the energy difference between their lowest unoccupied molecular orbitals to construct deep trap sites. By capturing free carriers injected at the electrode interface under high temperature and strong electric field conditions, electron migration is restricted, thereby blocking leakage conduction paths within the bulk phase of the material. This invention effectively reduces Joule heat accumulation during charge transport, improves the high-temperature withstand voltage and insulation reliability of the film, while maintaining relatively low dielectric loss. This all-organic blend system avoids local electric field distortion caused by inorganic filler agglomeration, and the preparation process is simple and mild, facilitating large-scale engineering applications.

This invention discloses a low-frequency flexible microwave absorbing composite material based on the localized field enhancement effect and its preparation method, relating to the field of electromagnetic protection technology. It aims to solve the problems of large thickness and difficult conformal design of complex curved surfaces in traditional microwave absorbing structures at low frequencies. The composite material comprises, from top to bottom: a flexible metasurface patterned layer with specific sheet resistance and topological array, a flexible polymer dielectric layer dispersed with modified magnetic filler, and a bottom total reflection layer. This invention utilizes the strong localized electromagnetic field excited by the metasurface to focus and penetrate into the dielectric layer, amplifying the dissipation potential of the magnetic filler; simultaneously, the bulk loss of the dielectric layer generates reverse damping on the metasurface resonance, thus broadening the bandwidth. This synergistic mechanism breaks the quarter-wavelength limitation. The preparation method includes pattern layer molding, dielectric layer mixing and curing, and overall composite molding. This invention achieves high-efficiency low-frequency broadband absorption at a single-layer subwavelength thickness, while also possessing excellent flexibility, making it highly suitable for stealth on complex curved surfaces with total reflection boundaries.

The preparation method of sodium yttrium fluoride modified polyetherimide-based composite dielectric film includes the following steps: Step 1, preparing a sodium yttrium fluoride solution and a diamine dispersion, and adding the sodium yttrium fluoride solution to the diamine dispersion; Step 2, adding bisphenol A type diether dianhydride in batches to the diamine dispersion to obtain a polyamic acid colloid; Step 3, vacuum-bubbling the polyamic acid colloid, then uniformly coating it onto a glass plate to form a composite film, removing the solvent from the film in a high-temperature oven, maintaining the temperature, and cooling to obtain the sodium yttrium fluoride modified polyetherimide-based composite dielectric film; Sodium yttrium fluoride comprehensively improves the dielectric and energy storage performance of PEI through multi-mechanism coupling of interfacial bonding, trap regulation, structural optimization, thermomechanical enhancement, and dielectric synergy, providing an effective path for the design of high-performance polymer dielectric materials.

A device includes a die with a protective overcoat and a substrate, the substrate comprising a first region and a second region that are spaced apart. The device also includes an isolation dielectric between the protective overcoat and the die. A pre-metal dielectric (PMD) barrier is between the isolation dielectric and the substrate, the PMD barrier having a first region that contacts the first region of the substrate and a second region that contacts the second region of the substrate, the first region and the second region of the PMD barrier being spaced apart. A through trench filled with a polymer dielectric extends between the first region and the second region of the substrate, and between the first region and the second region of the PMD barrier to contact the isolation dielectric.