A process for preparing a composition from graphite material by contacting the graphite material with a main solvent comprising at least 10% by weight, with respect to a total weight of the main solvent, of a vinyl aromatic monomer alone or in a mixture up to 50% by weight with additional copolymerizable monomers, thereby forming a starting composition; subjecting to an ultrasound treatment with a frequency spectrum ranging between 18 kHz and 1000 kHz, at a pressure equal to or higher than 2 bar absolute and in a container or sonication chamber wherein no separated phase of fluid at the gaseous phase contacts said composition; and polymerizing at least 1% of the vinyl aromatic monomer present in the main solvent, wherein the composition is at least partially polymerized and contains graphene and graphene nanoplatelets durably dispersed in the solvent, and the composition is without any evident formations of deposits or separated phases for at least 30 days.

The present invention relates to a composition containing graphene and graphene nanoplatelets durably dispersed in a solvent. Said composition is characterized in that it contains at least 1% by weight, with respect to the total weight of the solvent, of a vinyl aromatic polymer and comprises a mass concentration of graphene and graphene nanoplatelets (GRS) ranging from 0.001% to 10% by weight with respect to the total weight of the solvent. The vinyl aromatic polymer present in the composition is obtained by partial or total polymerization of the relative vinyl aromatic monomer alone or mixed with up to 50% by weight of further copolymerizable monomers. The composition must satisfy the condition that the sum of the possible content of non-reacted monomers and the content of vinyl aromatic polymer formed is equal to at least 10% by weight with respect to the total weight of the solvent.

An electronic article comprises an electronic component bonded to a composite composition. The composite composition comprises a crosslinked silicone foam having polydimethylsiloxane segments, and electromagnetically responsive particles retained in the crosslinked silicone foam. Composite compositions comprising carbon nanotubes and electromagnetic wave shielding articles including them are also disclosed.

A foam formulation for preparing polymer-grafted nanoparticles stabilized foam, including nanoparticles, monomers of a polymer to be grafted on the nanoparticle surface, polymerization initiator, surfactant and water. The polymer-grafted nanoparticles may act together with the surfactant to form single-layer assembling at the boundary of bubbles, which in turn stabilizes the foam. The generated foam shows much better stability in long-term storage, high-temperature drying process and alkaline environments than conventional wet foams. A method of preparing solid porous materials with the foam is also provided.

Foam compositions are provided including a polylactic acid polymer; second (e.g., polyvinyl acetate) polymer having a glass transition temperature (T.sub.g) of at least 25 C.; and plasticizer. Also described are articles comprising the foam compositions, such as a sheet or hearing protection article. Methods of making and using the foam compositions are further described herein.

A foam material includes the reaction product of a polyol mixture and an isocyanate mixture, and a MXene filler in an amount up to about 0.5 wt. %. A method of forming the foam material includes adding a MXene filler in an amount up to about 0.5 wt. % into one of a polyol mixture and an isocyanate mixture, the MXene filler being in the form of layered flakes, combining the MXene filler, one of the polyol mixture and the isocyanate mixture, and a bonding enhancer to form a first liquid component into a high shear exfoliation mixer. During mixing, the MXene filler is delaminated into single layers, each of the single layers being arranged in random orientations, which is then combined with the other of the polyol mixture or the isocyanate mixture to form the foam material.

A method for preparing an asymmetric wettable polyimide fiber-based photothermal aerogel is provided. The method includes the steps: uniformly mixing polyimide powder and a solvent, then, performing electrostatic spinning, and cutting an obtained fiber felt into pieces for later use; mixing the broken fibers, polyamic acid and tert-butyl alcohol, then, performing shearing to form a stable dispersion liquid for low-temperature directional freezing, and performing freeze-drying and high-temperature thermal imidization to obtain a polyimide fiber-based aerogel material; and soaking the above aerogel material in a hydrophilic monomer solution for a polymerization reaction, and then performing low-temperature directional freezing and freeze-drying to obtain a hydrophilic polyimide fiber-based aerogel. The aerogel is placed under light source irradiation, and dropwise coating is performed on an upper surface of the aerogel with a hydrophobic filler resin mixed solution to obtain the asymmetric wettable fiber-based photothermal aerogel.

A precursor composition comprising, before cure, an acrylic ethylene monomer (AEM), a foaming agent, and one or more of a strengthening additive, a thermal ablation additive, or a reflectivity additive. The precursor composition is cured to form a protective article comprising a foamed protective material. A method of forming a protective article is also disclosed, as is an aerospace structure comprising the foamed protective material.

Implantable devices for orthopedic, including spine and other uses are formed of porous reinforced polymer scaffolds. Scaffolds include a thermoplastic polymer forming a porous matrix that has continuously interconnected pores. The porosity and the size of the pores within the scaffold are selectively formed during synthesis of the composite material, and the composite material includes a plurality of reinforcement particles integrally formed within and embedded in the matrix and exposed on the pore surfaces. The reinforcement particles provide one or more of reinforcement, bioactivity, or bioresorption.

A composition and method for making extruded polystyrene (XPS) foam is provided. The composition includes carbon dioxide as a major blowing agent to achieve an XPS foam having an improved thermal insulation performance.