A polyethylene according to the present disclosure maintains a stable crystal structure at a high temperature and ensures excellent uniformity in chlorine distribution, thereby preparing a chlorinated polyethylene having excellent chlorination productivity and thermal stability by reacting with chlorine, and may also prepare a PVC compound with improved impact strength by including the chlorinated polyethylene.

The disclosure relates to a hydrogenated styrenic block copolymer with high vinyl content, low viscosity, low order-disorder temperature and improved processability. The hydrogenated styrenic block copolymers can be extruded or molded with a minimum of additives. The hydrogenated styrenic block copolymers have high melt flows allowing for ease in processing such as injection molding, overmolding, dipping, extrusion, roto-molding, slush molding, fiber spinning, film making, 3D printing and foaming.

Provided is a secondary battery electrode additive with which an active material can be coated without heat treatment that is performed at a high temperature for a long period of time, an alkaline component can be neutralized, and the decomposition of an electrolytic solution can be suppressed. For example, provided is a secondary battery electrode additive comprising a boronic acid derivative represented by formula (5).

##STR00001##

(In the formula, R.sup.1-R.sup.5 each independently represent a hydrogen atom, an alkyl group, an ester group, a glycol chain, an alkoxy group, or a hydroxy group, and R.sup.6 represents a hydrogen atom, a methyl group, or an ethyl group.)

The disclosure relates to an article comprising a substrate and an antifog coating layer provided on at least one surface of the substrate. The antifog coating layer comprises a sulfonated styrenic block copolymer (SSBC) having a block A, a block B, and a block D. Block A is a polymer block resistant to sulfonation and derived from a para-substituted styrene monomer, block B is a polymer block susceptible to sulfonation and derived from a vinyl aromatic monomer, and block D is a polymer block resistant to sulfonation and derived from a conjugated diene monomer. The antifog coating layer provides long-term antifog as well as anti-microbial protection properties. The selection of a specific solvent system can modify the SSBC film morphology leading to enhanced antifog property. The antifog coating layer adheres well to targeted substrates and has abrasion resistance property.

Provided are a polyvinyl alcohol-based resin having an excellent plugging effect and a plugging agent for underground treatment. A polyvinyl alcohol-based resin is disclosed, in which a degree of swelling (%) when the polyvinyl alcohol-based resin is immersed in water at 40 C. for 30 minutes and a solubility (%) when the polyvinyl alcohol-based resin is immersed in water at 65 C. for 5 hours satisfy the degree of swelling/the solubility3.0.

A nanocomposite, comprising a carbonaceous perimorph, the perimorph comprising at least one cell. The cell comprises a cell wall possessing an average thickness of less than 100 nm and a morphology evolved from a template. The composite comprises an interior space having a morphology evolved from the template with a diameter between 10 nm and 1,000 nm, and one of a linear structure, a non-linear structure, and an infiltrated endomorph. The endomorph substantially fills the interior space of the perimorph.

A temperature-resistant calcium-resistant water-based drilling fluid for oil and gas reservoir protection and a use thereof is provided. The water-based drilling fluid contains a filtrate reducer and a plugging agent, wherein the filtrate reducer is a copolymer that contains structural units represented by formula (1), structural units represented by formula (2), and structural units represented by formula (3), wherein, the mass ratio of the structural units represented by formula (1) to the structural units represented by formula (2) to the structural units represented by formula (3) is (0.1-0.2):1:(0.05-0.1), and the number-average molecular weight of the copolymer is 10,000-100,000, the plugging agent is acrylamide-diallyldimethylammonium chloride copolymer modified graphene. The water-based drilling fluid described can exhibit excellent filtrate reducing, plugging, temperature-resistant, anti-collapsing, and reservoir protective performance when it is applied in well drilling in deep high-temperature wells.

Polar modifier systems based on a blend of DTHFP, ETE, TMEDA, DMTHFMA and/or functionally similar compounds with BDMAEE and SMT are used to make block copolymers having high levels of pendant vinyl double bond repeat units, which is through highly selective 1,2-bond butadiene addition, low vinylcyclopentane formation, unimodal narrow molecular weight distribution, and a low level of randomized co-monomer repeat units. The block copolymers have very high levels of 1,2-vinyl content and high 3,4-vinyl bond addition of the conjugated diene monomer and low vinylcyclopentane content. The polar modifier systems provide a fast polymerization rate, with a unimodal narrow molecular weight distribution. The polar modifier systems allow operation at a higher temperature than in prior art systems, which reduces cooling requirements.

Described herein are cationic polymers having a plurality of quaternary amino groups, methods of making such polymers, and uses of such polymers as ion exchange membranes in electrochemical devices.

The invention is related to a process for producing modified polyethylene having decreased melt flow rate (5 kg, 190 C.) (MFR). In particular, the present invention is directed to a process in a controlled manner for producing modified polyethylene recyclates having low MFR and low gel content directly by reactive extrusion processing.