The present invention relates to a method which allows quick and effective hydration of associative polymers, in particular those intended for use in the field of oil drilling. This method uses a specific solid formulation, which can be easily hydrated, including, in a pre-mixture, said associative polymers and surfactants capable of improving the hydration of these polymers.

An ion exchange membrane obtained by using an ionic monomer having at least two or more polymerizable functional groups, in which a hydrophobicity index H obtained by an expression below from a monomer for forming an ion exchange resin and a material fixed to the resin in the ion exchange membrane is 1.6 or greater, and a manufacturing method therefor. Hydrophobicity index H=Σ{(log P of each component)×(molar ratio of each material in resin)}.

A polymer gel may comprise a polymer gel base material and superparamagnetic nanoparticles. At least 25 wt. % of the superparamagnetic nanoparticles may have diameters in a first size range between a first diameter and a second diameter. At least 25 wt. % of the superparamagnetic nanoparticles may have diameters in a second size range between a third diameter and a fourth diameter. The Brownian relaxation time of the portion of the superparamagnetic nanoparticles in the first size range may be at least 5 times the Neel relaxation time of the portion of the superparamagnetic nanoparticles in the first size range. The Neel relaxation time of the portion of the superparamagnetic nanoparticles in the second size range may be at least 5 times the Brownian relaxation time of the portion of the superparamagnetic nanoparticles in the second size range. Methods for monitoring gel integrity in a wellbore are further included.

A method for the super-activation of emulsion polymers is provided. The method includes carrying out a one to three-step polymer activation process to form an activated polymer-diluent mixture, the steps selected from (a)-(d): (a) premixing the first polymer-diluent mixture at a predetermined pressure to form a second polymer-diluent mixture; (b) blending the first polymer-diluent mixture or the second polymer-diluent mixture with a blending device to form a blended polymer-diluent mixture; (c) (i) recycling the blended polymer-diluent mixture to be blended as in step (b) or premixed as in step (a) at a predetermined pressure; or (ii) recycling the second polymer-diluent mixture to be premixed as in step (a) at a predetermined pressure; and (d) reducing the pressure in a portion of the blended polymer-diluent mixture or the second polymer-diluent mixture to relax the polymer and form a relaxed polymer-diluent mixture.

The invention relates to powdery, water-soluble, cationic polymer composition comprising at least two different cationic polymers, namely a first cationic polymer and a second cationic polymer, which differ in chemical nature and molecular weight, as well to a method for producing such powdery, water-soluble, cationic polymer composition, and to its use for promoting flocculation in solid-liquid separation, for example as a retention aid in paper manufacture, and in sludge dewatering/wastewater purification.

The present disclosure provides a preparation method of a porous hydrogel adsorbent based on Radix Astragali residues, including the following steps: subjecting residues of Chinese herbal medicine Radix Astragali as a precursor to bleaching with NaClO.sub.2, alkaline washing with KOH, and high power ultrasonic treatment, thereby obtaining a precursor solution of uniformly dispersed cellulose nanofibers (CNFs); adding the precursor solution of CNFs to a mixed solution of N,N′-methylene bisacrylamide (MBA), acrylic acid (AA) and ammonium persulfate (APS), shaking evenly, and initiating a polymerization reaction at a predetermined temperature to form a monolithic gel; and cleaning the monolithic gel, putting the cleaned monolithic gel into a dimethyl sulfoxide (DMSO) solution containing epichlorohydrin to allow reaction, and transferring the product of the reaction to an aqueous sodium hydroxide solution containing triethylene tetramine to allow reaction, thereby finally obtaining an amino-functionalized porous hydrogel adsorbent.

Provided are a pickering emulsion including: 0.01-20 wt % of particles having an average particle diameter of 10 nm-100 μm, and 0.01-20 wt % of a non-ionic water-soluble polymer, wherein the particles are positioned on an oil droplet surface, and a method of preparing the same.

An inverse emulsion copolymer composition comprises (A) an aqueous phase comprising a cross-linked hydrophilic polyelectrolyte copolymer (A′) obtained by the free radical copolymerisation of: (i) at least one anionic ethylenically unsaturated monomer bearing a negatively charged group and one polymerisable C═C double bond, or at least one cationic ethylenically unsaturated monomer bearing a positively charged group and one polymerisable C═C double bond, and (ii) at least one non-ionic ethylenically unsaturated cross-linking monomer bearing at least two polymerisable C═C double bonds, and (iii) optionally, one or more hydrophilic non-ionic ethylenically unsaturated monomers bearing one polymerisable C═C double bond, (B) an oil phase comprising a carrier oil (C), (D) (i) at least one water-in-oil emulsifying surfactant, and (D) (ii) at least one oil-in-water emulsifying surfactant; characterised in that the carrier oil component (C) of the oil phase comprises from 75% to 100%, by weight of the said carrier oil component (C), of farnesane (2, 6, 10-trimethyldodecane). The compositions are effective for use as thickeners for thickening aqueous solutions, including solutions which contain dissolved salts. The compositions also show excellent thickening in acidic solutions than counterpart compositions containing paraffinic oils.

A compound made by copolymerizing a poly(N-isopropylacrylamide) chain transfer agent, an acrylate salt, and a polyethylene glycol diacrylate. A compound made by copolymerizing a polyethylene glycol, a glycerol ethoxylate, and an aliphatic diisocyanate.

Membranes having an average pore size of 5 nm to 5,000 nm and a porosity of 15% or more, said membrane being obtainable by a process comprising curing a composition comprising: 5 to 64 wt % of (i) a cross-linking agent comprising at least one cationic group; and 36 to 95 wt % of (ii) inert solvent(s).

The membranes are useful for detecting, filtering and/or purifying biomolecules.