A method of recycling a water dispersible sulfonated polymer material used as a support structure in an additive manufacturing process includes providing a tap water bath and placing a printed part having an adhered support structure into the tap water bath, the support structure comprising a water-soluble sulfonated polymer material. The method includes dissolving the sulfonated polymer material in the water bath to thereby create a dispersion, and modifying the ionic strength of the dispersion by adding a multivalent metal salt to the dispersion at a concentration of between 1 gram/L and 30 grams/L, to precipitate the dissolved sulfonated polymer material from the water. The method includes recovering the precipitated sulfonated polymer material from the water, drying the recovered sulfonated polymer material and reforming the dried sulfonated polymer material into a form suitable for subsequent use as a consumable feedstock in an additive manufacturing process.

One embodiment relates to a charge transport polymer containing a molecular chain and terminal groups bonded to the molecular chain, wherein the terminal groups include a terminal group P containing a polymerizable functional group and a terminal group B containing an aromatic hydrocarbon group substituted with a branched or cyclic substituent, and among the carbon atoms contained in the ring of the aromatic hydrocarbon group, if the carbon atom that is bonded to the molecular chain is numbered 1, and numbers are assigned in order to the adjoining carbon atoms, then the branched or cyclic substituent is bonded to a carbon atom numbered 1+2n (wherein n is an integer of 1 or greater).

The present invention provides a foamed urethane sheet which is formed from an aqueous urethane resin composition containing a urethane resin (A), an aqueous medium (B), and a surfactant (C) having 10 or more carbon atoms, and has a density of 200 to 1,000 kg/m.sup.3. Further, the present invention provides a synthetic leather having at least a substrate (i) and a polyurethane layer (ii), wherein the polyurethane layer (ii) is formed from the foamed urethane sheet according to any one of claims 1 to 4. The polyurethane layer (ii) may be embossed. The surfactant (C) is preferably a stearic acid salt, and the urethane resin (A) which has an anionic group, and has a flow starting temperature of 80° C. or higher is preferably used.

An object of the present invention is to provide a gel material including a solvophilic polymer having a μm-scale porous structure.

A polymer gel in which solvophilic polymer units are cross-linked with each other, wherein the polymer gel contains a solvent and has a three-dimensional network structure having two regions: a first region in which the polymer units are densely present and a second region in which the polymer units are sparsely present, and a mesh size composed of the first region is from 1 to 500 μm.

A biocompatible, covalently cross-linked, polymer that is obtained by reacting an electrophilically activated polyoxazoline (EL-POX) with a nucleophilic cross-linking agent is disclosed. The EL-POX comprises m electrophilic groups; and the nucleophilic cross-linking agent comprises n nucleophilic groups, wherein the m electrophilic groups are capable of reacting with the n nucleophilic groups to form covalent bonds; wherein m2, n2 and m+n5; wherein at least one of the m electrophilic groups is a pendant electrophilic group and/or wherein m3; and wherein the EL-POX comprises an excess amount of electrophilic groups relative to the amount of nucleophilic groups contained in the nucleophilic cross-linking agent. Biocompatible medical products and kits comprising the cross-linked POX-polymers are also disclosed.

A perovskite film, method of preparing thereof, and an optoelectronic device are provided. They are prepared by steps including preparing a mixture containing a first monomer and a second monomer which can be crosslinked in situ; performing an annealing process, and the first monomer and the second monomer are reacted in situ to form a first polymer which combines with the perovskite crystal grains formed by the perovskite precursor and is concentrated at a crystal grain boundary of the perovskite crystal grains to passivate the perovskite crystal grain defects, and then a perovskite film is formed by curing.

A crosslinked embolic hydrogel is disclosed, the crosslinked embolic hydrogel comprising a hydrophilic polymer functionalized with first reactive groups and a crosslinking agent functionalized with second reactive groups; wherein the first and second reacting groups comprise a biorthogonally reactive pair that react to form the crosslinked embolic hydrogel. Methods and systems are also disclosed.

Isoporous block copolymers of cross-linked structures, and methods of preparing, which are resistant to harsh solvent conditions from organic, acidic or basic materials are disclosed.

A method of producing an ion-conducting membrane containing a polymer having an ionic group, involves multiple liquid treatment steps in which a precursor membrane is brought into contact with an acid treatment solution or an alkali treatment solution, the precursor membrane containing a polymer in a state in which the aforementioned ionic group forms a salt with an impurity ion, wherein the liquid treatment time in the second and subsequent liquid treatment steps of the multiple liquid treatment steps is shorter than the liquid treatment time in the initial liquid treatment step.

A compositions-of-matter in the form of HIPE-templated hydrogels, comprising a crosslinked polymer of zwitterionic monomers, which exhibit unusual antipolyelectrolyte characteristics, dual pH-, and temperature-responsiveness, as well as processes of obtaining the same and using the same.