A temperature-responsive material having a structure represented by formula (I): ##STR00001## is provided, where in formula (I), X has a structure represented by formula (i) or formula (ii): ##STR00002## x and y are in a molar ratio of 9:1 to 1:3, n is an integer of 7 to 120, and m is an integer of 10 to 1,000.

Provided herein are biodegradable polymers and nanoparticles comprising such polymers. The present nanoparticles deliver antibiotics to infected tissue with enhanced antibacterial efficacy. Thus, the present technology provides a nanoparticle comprising: a surface comprising one or more polysaccharides having specific binding affinity for bacteria; a core comprising a biodegradable polymer; and an antibacterial drug loaded within the core; wherein the biodegradable polymer comprises nitrogen-containing ionizable functional groups; the one or more polysaccharides having specific binding affinity for bacteria; and disulfide groups; the one or more polysaccharides are attached to the biodegradable polymer through phenyl boronic ester linkages; and the nanoparticle surface displays the polysaccharides such that the polysaccharide are available to bind to a bacterial cell surface.

A resin includes a unit represented by Chemical Formula 1, a method for preparing the same, a resin composition including the same, and a molded article including the resin composition

##STR00001## in Chemical Formula 1, Ar1, Ar2, R1, r1, X1 to X4, Z1, Z2, a and b are described herein.

A curing agent composition and a curing agent coating formula thereof are provided. The curing agent composition includes 5 to 25 wt % of an ester group-containing amine end group adduct, 2 to 25 wt % of a C8-C22 hydrophobic saturated or unsaturated fatty amine, 2 to 25 wt % of a polyamine compound, 2 to 20 wt % of a silane compound, and 10 to 60 wt % of an ether solvent.

A compound, comprising a segment having the formula (AA) or (BB):

##STR00001## wherein C.sub.31 and C.sub.32 are carbons (C), wherein R.sub.32 and R.sub.33 are both hydrogens or collectively forms a carbonyl with C.sub.31, wherein R.sub.34 and R.sub.35 are both hydrogens or collectively forms a carbonyl with C.sub.32, wherein X is oxygen (O) or nitrogen attached to an organic residue, wherein R.sub.31 is a hydrogen, a hydroxymethyl, a halogen-substituted methyl, or an unsubstituted methylene —CH.sub.2— group covalently and directly bonded to X, wherein dashed lines (---) represent optional covalent bonds to satisfy valence.

The present invention relates to processes for the formation of pyridinedicarboxylic acid (PDCA), in particular, 2,4-pyridinedicarboxylic acid (2,4-PDCA) and 2,5-pyridinedicarboxylic acid (2,5-PDCA), and mono- and diester derivatives thereof, from 3,4-dihydroxybenzoic acid, via a biocatalytic reaction using, for example, a protocatechuate dioxygenase such as protocatechuate 4,5-dioxygenase or protocatechuate 2,3-dioxygenase, and a nitrogen source. The invention also relates to copolymers that comprise the pyridinedicarboxylic acid monomers and derivatives thereof, processes for the formation of the copolymers and uses for the copolymers.

Embodiments of the present disclosure are directed towards solvent-based compositions that include a reaction product formed by reacting a polyol and an aminopolycarboxylic compound.

An orthodontic article is described comprising the reaction product of free-radically polymerizable resin comprising at least one dicarbonyl polymer comprising polymerized units of oxamate, oxalate, or a combination thereof and at least two free-radically polymerizable groups. Also described are dicarbonyl polymers, methods of making dicarbonyl polymers and method of use for the described polymerizable resin are also described.

The chelation crosslinked polymers include a polymer backbone having one or more chelation crosslinking group(s) at least partially bonded to one or more cation(s). The chelation crosslinking groups may be within a polymer backbone and/or pendant from the polymer backbone. The chelation crosslinked polymers may be chelation crosslinked polyesters. The chelation crosslinked polymers can be used in tissue engineering applications to form tissue grafts and scaffolds.

Provided is a compound which may be obtained by esterification condensation of components as described herein. The compound may be used as a collector for ore enrichment (flotation), as a corrosion inhibitor, as a viscosity enhancer, emulsifier or stabilizer that is useful for the oil and gas industry, as a clay modifier, as an adhesion promoter, as an antiagglomerant additive, as an additive in haircare products, as a fabric softener, as an antistatic agent in polymers, as a bitumen emulsion additive, as a detergency cationic agent, as a fertilizer additive, as an antiagglomerant for hydrates, as a lubrication or adhesion-promoting additive, for example.