A composition for forming a fiber includes at least one polyamide and caprolactam. The at least one polyamide has a number average molecular weight between 38,000 Da and 100,000 Da. The polyamide is at least partially dissolved in the caprolactam. The caprolactam comprises between 20 wt. % and 90 wt. % of the composition.

The present invention relates to a method for producing an ionic liquid-containing structure, including: an inorganic network structure forming step of forming a network structure of an inorganic compound in the presence of an ionic liquid; and a polymer network structure forming step of forming a polymer network structure of a prepolymer and a crosslinking agent in the presence of the ionic liquid.

A process for dissolving modified cellulose is disclosed. The process includes contacting modified cellulose with a solvent in a mixture to form swelled modified cellulose and then contacting the mixture with a salt to dissolve the swelled modified cellulose.

Provided herein are methods of fabricating membranes using polymers with functionalized groups such as sulfone (e.g., PSf and PES), ether (e.g., PES), acrylonitrile (e.g., PAN), fluoride (e.g., pvdf and other fluoropolymers), and imide (e.g., extem) and ionic liquids. Also provided are membranes made by the provided methods.

The present disclosure relates to a polysulfide copolymer particle and a method of preparing the polysulfide copolymer particle.

The present invention includes a method for dissolving cellulose comprising dissolving cellulose in an ionic liquid and a co-solvent, wherein the ionic liquid is an imidazolium-based ionic liquid with, e.g., a halide or acetate as the anion.

A composition for preparing polyamide powders, includes polyamide granules, a nucleating agent and an organic solvent having a boiling point ranging from 190 C. to 209 C. The weight ratio of the polyamide granules to the organic solvent ranges from 0.11 to saturation solubility of the polyamide granules is the organic solvent, and the weight ratio of the polyamide granules to the nucleating agent is 100:1.

Solvents that are suitable for use with polyurethane-polyurea based rheology modifying agents of the type which, in the past, have generally been formulated as solids or viscous liquids. The present solvents enable the rheology modifying agents to be prepared and formulated in a liquid or solution form more suited to prepare coating formulations that include polyurethane-polyurea based rheology modifying agents. The present solvents are N-alkyl substituted caprolactams, including N-methyl caprolactam, N-ethyl caprolactam, N-butyl caprolactam, and mixtures thereof, which are aprotic, non-toxic, have good solvency for polar groups such as those found in polyurethanes and polyureas, are thermally stable, and have high boiling points and low vapor pressure.

A method of preparing polyamide (PA) powders includes the steps of: heating a composition including PA granules, a nucleating agent and an organic solvent under normal pressure to T.sub.1 not lower than melting point (T.sub.m) of PA granules and maintaining at T.sub.1 to dissolve PA granules; cooling the heated composition to T.sub.2 to nucleate the dissolved PA granules and maintaining at T.sub.2 to crystallize, where 15 C.T.sub.mT.sub.233 C.; cooling the crystallization product to precipitate PA; and washing the precipitated product to remove the organic solvent. The weight ratio of PA granules to the nucleating agent is 100:1, and the weight ratio of PA granules to the organic solvent ranges from 0.11 to saturation solubility of PA granules in the organic solvent.

A solution contains at least one sulfone polymer and N-tert.-butyl-2-pyrrolidone. The solution can be used in a process of making a membrane, which is useful for water treatment.