An ophthalmic device is disclosed which is a polymerization product of a monomeric mixture comprising: (a) a major amount of one or more first non-silicone-containing hydrophilic monomers; (b) one or more hydrophobic monomers; and (c) a crosslinking agent mixture comprising (i) one or more di-, tri- or tetra(meth)acrylate-containing crosslinking agents and (ii) one or more di-, tri- or tetracarbamate-containing crosslinking agents, wherein the ophthalmic device has an equilibrium water content of at least about 65 weight percent.

A carbon material-polymer strain sensitive film and its preparation method are disclosed. The carbon material-polymer strain sensitive film includes multiple layers of carbon sensitive films and multiple layers of polymer films, wherein the multiple layers of carbon sensitive films and the multiple layers of polymer films form a multi-layer composite film in sequence through a layer-by-layer assembly process. The preparation method includes steps of: cleaning, processing a hydrophilic treatment and processing a hydrophobic treatment on a rigid substrate in sequence; preparing a carbon material in dispersion solution and a polymer dispersion solution; through a layer-by-layer self-assembly process, growing the polymer and the carbon material in a form of layer-by-layer on the rigid substrate; transferring the composite film from the rigid substrate to a flexible substrate; and pasting two electrodes at two ends of the composite film and encapsulating with a flexible film.

A carbon material-polymer strain sensitive film and its preparation method are disclosed. The carbon material-polymer strain sensitive film includes multiple layers of carbon sensitive films and multiple layers of polymer films, wherein the multiple layers of carbon sensitive films and the multiple layers of polymer films form a multi-layer composite film in sequence through a layer-by-layer assembly process. The preparation method includes steps of: cleaning, processing a hydrophilic treatment and processing a hydrophobic treatment on a rigid substrate in sequence; preparing a carbon material in dispersion solution and a polymer dispersion solution; through a layer-by-layer self-assembly process, growing the polymer and the carbon material in a form of layer-by-layer on the rigid substrate; transferring the composite film from the rigid substrate to a flexible substrate; and pasting two electrodes at two ends of the composite film and encapsulating with a flexible film.

The disclosure belongs to the technical field of synthetic adhesives, and discloses a bionic wet surface adhesion promoter and the preparation thereof, and a room temperature curable silicone sealant composition and the preparation thereof. A method for preparing a bionic wet surface adhesion promoter includes: reacting polyvinylpyrrolidone with 2-chloro-3,4-dihydroxyacetophenon; purifying the product obtained in the reaction step using n-hexane; drying the product obtained in the purification step using a vacuum drying process; and grinding the product obtained in the drying step into powder using a ball milling process; wherein the mass ratio of polyvinylpyrrolidone to 2-chloro-3,4-dihydroxyacetophenon is (0.81.2):1. The room temperature curable silicone sealant composition according to the disclosure includes the bionic wet surface adhesion promoter prepared by the above method, has good adhesion performance on both dry and wet surfaces and is well-suited for use in the construction field, especially for use in humid environments.

The disclosure belongs to the technical field of synthetic adhesives, and discloses a bionic wet surface adhesion promoter and the preparation thereof, and a room temperature curable silicone sealant composition and the preparation thereof. A method for preparing a bionic wet surface adhesion promoter includes: reacting polyvinylpyrrolidone with 2-chloro-3,4-dihydroxyacetophenon; purifying the product obtained in the reaction step using n-hexane; drying the product obtained in the purification step using a vacuum drying process; and grinding the product obtained in the drying step into powder using a ball milling process; wherein the mass ratio of polyvinylpyrrolidone to 2-chloro-3,4-dihydroxyacetophenon is (0.81.2):1. The room temperature curable silicone sealant composition according to the disclosure includes the bionic wet surface adhesion promoter prepared by the above method, has good adhesion performance on both dry and wet surfaces and is well-suited for use in the construction field, especially for use in humid environments.

A conductive composition including a conductive polymer (A), a water-soluble polymer (B) other than the conductive polymer (A), and a solvent (C), wherein a peak area ratio is 0.44 or less, which is determined based on results of analysis performed using a high performance liquid chromatograph mass spectrometer with respect to a test solution obtained by extracting the water-soluble polymer (B) from the conductive composition with n-butanol, and calculated by formula (I):

Area ratio=Y/(X+Y)

wherein X is a total peak area of an extracted ion chromatogram prepared with respect to ions derived from compounds having a molecular weight (M) of 600 or more from a total ion current chromatogram, Y is a total peak area of an extracted ion chromatogram prepared with respect to ions derived from compounds having a molecular weight (M) of less than 600 from the total ion current chromatogram.

Compositions herein may include an aqueous fluid, a crosslinked polyvinylpyrrolidone (PVP), and a betaine based polymer. Methods herein may include pumping a selected amount of a fluid loss pill into a formation, the fluid loss pill including a crosslinked PVP and a betaine based polymer.

Compositions herein may include an aqueous fluid, a crosslinked polyvinylpyrrolidone (PVP), and a betaine based polymer. Methods herein may include pumping a selected amount of a fluid loss pill into a formation, the fluid loss pill including a crosslinked PVP and a betaine based polymer.

The invention provides a polymerizable polydimethylsiloxane-polyoxyalkylene block copolymer which comprises (1) a linear polymer chain comprising at least two polydimethylsiloxane segments, one hydrophilic polyoxyalkylene segment between each pair of polydimethylsiloxane segments, and one amide-rich linker between each pair of one polydimethylsiloxane segment and one hydrophilic polyoxyalkylene segment, and (2) two terminal (meth)acryloyl groups. The hydrophilized polydiorganosiloxane vinylic crosslinker has a weight average molecular weight of at least 3000 Daltons. The invention is also related to a silicone hydrogel contact lens produced from a polymerizable polydimethylsiloxane-polyoxyalkylene block copolymer of the invention.

The invention provides a polymerizable polydimethylsiloxane-polyoxyalkylene block copolymer which comprises (1) a linear polymer chain comprising at least two polydimethylsiloxane segments, one hydrophilic polyoxyalkylene segment between each pair of polydimethylsiloxane segments, and one amide-rich linker between each pair of one polydimethylsiloxane segment and one hydrophilic polyoxyalkylene segment, and (2) two terminal (meth)acryloyl groups. The hydrophilized polydiorganosiloxane vinylic crosslinker has a weight average molecular weight of at least 3000 Daltons. The invention is also related to a silicone hydrogel contact lens produced from a polymerizable polydimethylsiloxane-polyoxyalkylene block copolymer of the invention.