Abstract: A cationic bis-urea compound is disclosed of formula (1): wherein: each m is independently an integer of 0 to 4, each k is independently 0 or 1, each Z? is a monovalent radical independently selected from the group consisting of hydroxyl (*—OH), carboxyl (*—COOH), cyano (*—CN), nitro (*—NO2), sulfonate (*—SO3?), trifluoromethyl (*—CF3), halides, amine groups, ketone groups, alkyl groups comprising 1 to 6 carbons, alkoxy groups comprising 1 to 6 carbons, thioether groups comprising 1 to 6 carbons, and combinations thereof, each L? is independently a divalent alkylene group comprising 1 to 6 carbons, wherein a *-[-L?-]k- is a single bond when k is 0, each Y? is independently a monovalent non-polymeric radical comprising a positive charged amine, and each X? is independently a negative charged counterion.

Abstract: A cationic star polymer is disclosed of the general formula (1): I?P?]w???(1), wherein w? is a positive number greater than or equal to 3, I? is a dendritic polyester core covalently linked to w? independent peripheral linear cationic polymer chains P?. Each of the chains P? comprises a cationic repeat unit comprising i) a backbone functional group selected from the group consisting of aliphatic carbonates, aliphatic esters, aliphatic carbamates, aliphatic ureas, aliphatic thiocarbamates, aliphatic dithiocarbonates, and combinations thereof, and ii) a side chain comprising a quaternary amine group. The quaternary amine group comprises a divalent methylene group directly covalently linked to i) a positive charged nitrogen and ii) an aromatic ring.

Abstract: A composition of matter comprises a cationic polymer comprising a polycarbonate chain fragment, the polycarbonate chain fragment comprising a repeat unit comprising a side chain moiety containing a quaternary amine group; and a non-charged polymer comprising a polyester chain segment and a poly(alkylene oxide) chain segment; wherein i) the cationic polymer and the non-charged polymer are amphiphilic and biocompatible, ii) the cationic polymer and the non-charged polymer form a mixed complex by non-covalent interactions in water, and iii) the mixed complex is a more effective antimicrobial agent against at least a Gram-negative microbe compared to the cationic polymer and the non-charged polymer alone when tested using otherwise identical conditions.

Abstract: A cationic bis-urea compound is disclosed of formula (1): wherein: each m is independently an integer of 0 to 4, each k is independently 0 or 1, each Z? is a monovalent radical independently selected from the group consisting of hydroxyl (*—OH), carboxyl (*—COOH), cyano (*—CN), nitro (*—NO2), sulfonate (*—SO3?), trifluoromethyl (*—CF3), halides, amine groups, ketone groups, alkyl groups comprising 1 to 6 carbons, alkoxy groups comprising 1 to 6 carbons, thioether groups comprising 1 to 6 carbons, and combinations thereof, each L? is independently a divalent alkylene group comprising 1 to 6 carbons, wherein a *-[-L?-]k- is a single bond when k is 0, each Y? is independently a monovalent non-polymeric radical comprising a positive charged amine, and each X? is independently a negative charged counterion.

Abstract: A method comprises forming a reaction mixture comprising a terephthalate polyester, a glycol comprising 2 to 5 carbons, and an amidine organocatalyst; and heating the reaction mixture at a temperature of about 120° C. or more to depolymerize the terephthalate polyester, thereby forming a terephthalate reaction product comprising a monomeric dihydroxy terephthalate diester; wherein the terephthalate reaction product contains terephthalate oligomers in an amount less than the amount of terephthalate oligomers that would result from i) substituting the amidine organocatalyst with an equimolar amount of a guanidine catalyst and ii) depolymerizing the terephthalate polyester under otherwise identical reaction conditions.

Abstract: A salt catalyst comprises an ionic complex of i) a nitrogen base comprising one or more guanidine and/or amidine functional groups, and ii) an oxoacid comprising one or more active acid groups, the active acid groups independently comprising a carbonyl group (C?O), sulfoxide group (S?O), and/or a phosphonyl group (P?O) bonded to one or more active hydroxy groups; wherein a ratio of moles of the active hydroxy groups to moles of the guanidine and/or amidine functional groups is greater than 0 and less than 2.0. The salt catalysts are capable of catalyzing ring opening polymerization of cyclic carbonyl compounds.

Abstract: A covalently crosslinked hydrogel comprises a) three or more divalent poly(alkylene oxide) chains P? covalently linked at respective first end units to a branched first core group C?, b) three or more divalent poly(alkylene oxide) chains P? covalently linked at respective first end units to a branched second core group C?, the chains P? comprising respective second end units which are covalently linked to between 0% and 100% of respective second end units of chains P? by divalent linking groups L?, and c) at least one pendant cationic block copolymer chain A?-B?. A?-B? comprises i) a divalent block A? comprising a poly(alkylene oxide) backbone chain having an end unit covalently linked to a second end unit of one of the chains P? by a divalent linking group L?, and ii) a monovalent block B? comprising a first repeat unit, the first repeat unit comprising a backbone carbonate group and a cationic side chain group.

Abstract: A cationic star polymer is disclosed of the general formula (1): I??P?]w???(1), wherein w? is a positive number greater than or equal to 3, I? is a dendritic polyester core covalently linked to w? independent peripheral linear cationic polymer chains P?. Each of the chains P? comprises a cationic repeat unit comprising i) a backbone functional group selected from the group consisting of aliphatic carbonates, aliphatic esters, aliphatic carbamates, aliphatic ureas, aliphatic thiocarbamates, aliphatic dithiocarbonates, and combinations thereof, and ii) a side chain comprising a quaternary amine group. The quaternary amine group comprises a divalent methylene group directly covalently linked to i) a positive charged nitrogen and ii) an aromatic ring.

Abstract: A covalently crosslinked hydrogel comprises a) three or more divalent poly(alkylene oxide) chains P? covalently linked at respective first end units to a branched first core group C?, b) three or more divalent poly(alkylene oxide) chains P? covalently linked at respective first end units to a branched second core group C?, the chains P? comprising respective second end units which are covalently linked to between 0% and 100% of respective second end units of chains P? by divalent linking groups L?, and c) at least one pendant cationic block copolymer chain A?-B?. A?-B? comprises i) a divalent block A? comprising a poly(alkylene oxide) backbone chain having an end unit covalently linked to a second end unit of one of the chains P? by a divalent linking group L?, and ii) a monovalent block B? comprising a first repeat unit, the first repeat unit comprising a backbone carbonate group and a cationic side chain group.

Abstract: A method comprises forming a reaction mixture comprising a terephthalate polyester, a glycol comprising 2 to 5 carbons, and an amidine organocatalyst; and heating the reaction mixture at a temperature of about 120° C. or more to depolymerize the terephthalate polyester, thereby forming a terephthalate reaction product comprising a monomeric dihydroxy terephthalate diester; wherein the terephthalate reaction product contains terephthalate oligomers in an amount less than the amount of terephthalate oligomers that would result from i) substituting the amidine organocatalyst with an equimolar amount of a guanidine catalyst and ii) depolymerizing the terephthalate polyester under otherwise identical reaction conditions.

Abstract: A salt catalyst comprises an ionic complex of i) a nitrogen base comprising one or more guanidine and/or amidine functional groups, and ii) an oxoacid comprising one or more active acid groups, the active acid groups independently comprising a carbonyl group (C?O), sulfoxide group (S?O), and/or a phosphonyl group (P?O) bonded to one or more active hydroxy groups; wherein a ratio of moles of the active hydroxy groups to moles of the guanidine and/or amidine functional groups is greater than 0 and less than 2.0. The salt catalysts are capable of catalyzing ring opening polymerization of cyclic carbonyl compounds.