The present disclosure relates to reversibly wrinkled silk-based compositions. The provided compositions are tunable and the reversible wrinkles are sensitive to water vapor, methanol vapor, and UV irradiation. The present disclosure also provides methods for making and using the same.

Provided is a thermally conductive silicone gel composition having high thermal conductivity, excellent extrudability and mixing stability, resistance to separation of each liquid even in a two-component package, stable storage, and superior gap fill properties for heat dissipating components, and the like. A multi-component thermally conductive silicone gel composition comprises: (A-1) an alkenyl group-containing organopolysiloxane having a degree of polymerization of 5 to 100; (A-2) an alkenyl group-containing organopolysiloxane having a degree of polymerization of 400 or more; (B) an organohydrogenpolysiloxane; (C) a catalyst for hydrosilylation reaction; (D) a thermally conductive filler; (E) a silane coupling agent, and the like; and (F) an organopolysiloxane having a hydrolyzable silyl group at the end of the molecular chain. A mixture viscosity of component (A-1) and component (A-2) is within a range of 1.15 to 5.50 times the viscosity of the component (A-1) at 25° C.

The present disclosure provides a pellet. In an embodiment, the pellet includes a body having a first end and an opposing second end. The body is composed of a polymeric material. The body has a length, a diameter (body diameter) and a channel. The channel has a diameter (channel diameter), the channel extends through the body from the first end to the second end. An additive in is the channel.

The present disclosure relates to a multilayer construction comprising a polymeric foam layer; and at least one spacer layer comprising a plurality of spacer elements, wherein each spacer element comprises a protruding portion and two opposite terminal portions, and wherein at least one terminal portion of each spacer element is fully embedded into the polymeric foam layer.

Herein is disclosed an elastomeric silicone composition comprising at least a first and a second glycerol phase which are distinct from each other and a method of making the same. The elastomeric compositions are special therein that zero-order active substance release can reversibly be obtained by modifying the glycerol content of the silicone composition.

A structured material is provided that includes a substrate and a porous structured polymer layer disposed thereon. The porous structured polymer layer includes a plurality of voids, and has a high hemispherical reflectance a high a hemispherical thermal emittance. The structured material is thus particularly advantageous for cool-roof coatings, enabling surfaces coated by the material to stay cool, even under strong sunlight. The material can be produced via structuring of polymers in a mixture including a solvent and a non-solvent. Sequential evaporation of the solvent and the non-solvent provide a polymer layer with the plurality of voids.

Systems and methods for producing aerogel materials are generally described. In certain cases, the methods do not require supercritical drying as part of the manufacturing process. In some cases, certain combinations of materials, solvents, and/or processing steps may be synergistically employed so as to enable manufacture of large (e.g., meter-scale), substantially crack free, and/or mechanically strong aerogel materials.

Disclosed are cellulose-based flexible gels containing cellulose nanorods, ribbons, fibers, and the like, and cellulose-enabled inorganic or polymeric composites, wherein the gels have tunable optical, heat transfer, and stiffness properties. The disclosed gels are in the form of hydrogels, organogels, liquid-crystal (LC) gels, and aerogels, depending on the solvents in the gels.

A preparation method for a spherical or angular powder filler, comprising: providing spherical or angular siloxane comprising a T unit, wherein the T unit is R.sub.1SiO.sub.3−, and R.sub.1 is a hydrogen atom or an organic group which can be independently selected from carbon atoms 1-18; and performing heat treatment on the spherical or angular siloxane under an inert gas atmosphere or atmospheric atmosphere, the heat treatment temperature being between 250 degrees and 650 degrees, so that silicon hydroxyl groups in the spherical or angular siloxane are condensed to obtain the spherical or angular powder filler. In the unit T of the spherical or angular powder filler, the content of the unit without containing a hydroxyl group in the total unit is greater than or equal to 95%, and the content of the unit containing one hydroxyl group in the total unit is less than or equal to 5%. Also disclosed are the spherical or angular powder filler obtained by the preparation method, and application thereof. The spherical or angular powder filler has low permittivity, low water absorption and low radioactivity.

A method for synthesizing a thermally conductive and stretchable elastomer composite comprises mixing liquid metal and soft material (e.g., elastomer) in a centrifugal or industrial shear mixer under conditions such that the liquid metal forms microscale liquid metal droplets that are dispersed in the soft elastomer. Liquid metal-embedded elastomers, or “LMEEs,” formed in this manner dramatically increase the fracture energy of soft materials up to 50 times over an unfilled polymer. This extreme toughening is achieved by means of (i) increasing energy dissipation, (ii) adaptive crack movement, and (iii) effective elimination of the crack tip. Such properties arise from the deformability and dynamic rearrangement of the LM inclusions during loading, providing a new mechanism to not only prevent crack initiation, but also resist the propagation of existing tears for ultra-tough, highly functional soft materials.