113 results about "Conjugate acid" patented technology

A lubricant including an ionic liquid, which includes a conjugate acid (B+) and a conjugate base (X−), and is protic, wherein the conjugate acid includes a straight-chain hydrocarbon group having 10 or more carbon atoms, and wherein the conjugate base is represented by the following general formula (1):where n is an integer of from 0 to 6 in the general formula (1).

The invention relates to a preparation method of carboxyl nitrile rubber through emulsion polymerization. According to the preparation method, acrylonitrile, an emulsifier, an adjusting agent, and an initiator are added into a polymerization kettle, then butadiene is added, emulsion polymerization is carried out under stirring, and in the late phase of emulsion polymerization, unsaturated carboxylic acid and / or anhydride thereof is added into the polymerization kettle. The obtained carboxyl nitrile rubber has a low content of gel and a two-layer molecular structure, the index of conjugated acid is controllable; during the processing process, a three-dimensional network structure can be easily formed, thus the mechanical and physical properties of rubber products made of the carboxyl nitrile rubber are good; after processing, the Mooney viscosity is increased, the crosslinking degree of finished products is good, and especially, the elongation at break is prominently improved.

Protic ionic liquids having a composition of formula (A−)(BH+) wherein A− is a conjugate base of an acid HA, and BH+ is a conjugate acid of a superbase B. In particular embodiments, BH+ is selected from phosphazenium species and guanidinium species encompassed, respectively, by the general formulas:The invention is also directed to films and membranes containing these protic ionic liquids, with particular application as proton exchange membranes for fuel cells.

The invention discloses an arsenic-trioxide-carrying pH-responsive mesoporous silica nanoparticle and a preparation method thereof. The preparation method of the arsenic-trioxide-carrying pH-responsive mesoporous silica nanoparticle mainly comprises the following steps: preparing amino modified mesoporous silica by adopting a coprecipitation method, and loading conjugate acid and base ATO and PAA through electrostatic adsorption for preparing PAA-ATO-MSNs. The prepared PAA-ATO-MSNs are circular or quasi-circular in appearance under a transmission electron microscope, average particle size is (158.6+ / -1.32)nm, Zeta potential is (-28.40+ / -0.34)mV, and encapsulation efficiency and drug loading rate are (40.95+ / -3.21)% and (11.42+ / -1.75)% respectively; in vitro drug release is pH-responsive, and accumulated release amount is increased along with reduction of pH value; pharmacokinetic study shows that compared with ATO-Sol and ATO-MSNs, t1 / 2beta of PAA-ATO-MSNs is obviously prolonged and AUC is obviously increased (P is less than 0.01); and PAA-ATO-MSNs in vitro drug release has obvious pH responsiveness and sustained release property, in vivo pharmacokinetic behaviours of a rat can be obviously improved, and the arsenic-trioxide-carrying pH-responsive mesoporous silica nanoparticle carrier can serve as an ATO tumour-targeted drug delivery system and has a good application prospect.

The present invention discloses a process for producing a core-shell polymer that comprises: (1) preparing a monomer solution which is comprised of (a) at least one monomer, optional one crosslinking monomer (b) a conjugate acid of a surfactant with a pKa of less than 14, and (c) a controlled free radical polymerization agent; (2) preparing an aqueous medium which is comprised of (a) water, and (b) a conjugate base of a weak acid wherein the pKb of the base is less than 14; and (3) mixing the monomer solution with the aqueous medium under conditions that result in the in-situ formation of an emulsifier to produce a polymerization medium, and (4) initiating free radical polymerization within the polymerization medium to produce a core polymer, wherein the core contains a free radical control agents, (5) adding a second monomer to the polymerization medium containing the core polymer, and (6) allowing polymerization to proceed in the presence of the free radical control agent to produce the core-shell polymer.

A composition for forming an electroactive coating is described, including an acid as a polymerization catalyst, at least one functional component, and at least one compound of formula (1) as a monomer: wherein X is selected from S, O, Se, Te, PR2 and NR2, Y is hydrogen (H) or a precursor of a good leaving group Y- whose conjugate acid (HY) has a pKa of less than 30, Z is hydrogen (H), silyl, or a good leaving group whose conjugate acid (HY) has a pKa of less than 30, b is 0, 1 or 2, each R1 is a substituent, and the at least one compound of formula (1) includes at least one compound of formula (1) with Z=H and Y<>H.

The present invention discloses an emulsion polymerization process that comprises: (1) preparing an aqueous polymerization medium which is comprised of (a) at least one monomer, (b) a polymerization control agent, and an emulsifier, wherein the emulsifier is prepared in-situ within the aqueous polymerization medium; and (2) initiating polymerization of said monomer within the aqueous polymerization medium. The subject invention more specifically reveals an emulsion polymerization process that comprises: (1) preparing a monomer solution which is comprised of (a) at least one monomer, (b) a conjugate acid of a surfactant with a pKa of less than 14, and (c) a controlled free radical polymerization agent; (2) preparing an aqueous medium which is comprised of (a) water, and (b) a conjugate base of a weak acid wherein the pKb of the base is less than 14; and (3) mixing the monomer solution with the aqueous medium under conditions that result in the in-situ formation of an emulsifier, and (4) initiating free radical polymerization.

A method of regenerating N-Methyl-D-glu-camine-functional resin that has been used for boron-removal uses a closed recirculating loop for treating the conjugate acid salt of the N-Methyl-D-glucamine functionality of the resin. The new method reduces rinse water demand and improves pH control in a water treatment system. The new method can be used to improve the performance of boron-selective resins in stand-alone systems or as a second stage in a reverse osmosis seawater desalination system. The regeneration method is useful in any application where weakly basic anion exchange resin in the conjugate acid salt form is to be regenerated (neutralized) by alkaline treatment. Possible end use applications are in drinking water processing, agricultural water treatment, sweetener production, waste water processing, mining hydrometallurgy, and condensate polishing.

A composition for forming an electroactive coating is described, including an acid as a polymerization catalyst, at least one functional component, and at least one compound of formula (1) as a monomer:wherein X is selected from S, O, Se, Te, PR2 and NR2, Y is hydrogen (H) or a precursor of a good leaving group Y− whose conjugate acid (HY) has a pKa of less than 30, Z is hydrogen (H), silyl, or a good leaving group whose conjugate acid (HY) has a pKa of less than 30, b is 0, 1 or 2, each R1 is a substituent, and the at least one compound of formula (1) includes at least one compound of formula (1) with Z=H and Y≠H.

The present invention relates to a composition comprising a hydrophobically modified alkylene oxide urethane polymer with pendant or end-capping tertiary amine groups, the conjugate acids of which have a pKa in the range of about 4.5 to about 6.5. The composition of the present invention is useful as a rheology modifier for paint formulations formulated over a wide pH range and is more stable to heat aging than higher pKa amine-modified HEURs.