A polymer composition containing a polymer (B) obtained by polymerizing a monomer composition containing: a methacrylic acid ester macromonomer (b1) represented by the following formula (1); and another monomer (b2). Also, a porous membrane formed from a membrane forming polymer (A) and the aforementioned polymer composition. ##STR00001##

A method of manufacturing a porous fluorine-containing polymer membrane is provided, which includes mixing a fluorine-containing polymer, a pore creating agent, and a solvent to form a mixture; forming a membrane of the mixture, and removing the pore creating agent and the solvent in the membrane to form the porous fluorine-containing polymer film. The pore creating agent has a chemical formula of

##STR00001##

wherein R.sup.1 is a C.sub.1-8 alkyl group, a C.sub.2-8 alkenyl group, a C.sub.2-8 alkynyl group, or a C.sub.6-12 aromatic group, and A.sup. is hydrogen sulfite ion, dihydrogen phosphate ion, nitrate ion, halogen ion, or a combination thereof. The solvent has a chemical formula of

##STR00002##

A method of making a polyurethane polymerized high internal phase emulsion (polyHIPE) is disclosed. The method involves preparing a polyurethane prepolymer and crosslinking the polyurethane prepolymer using a thiol-alkene Michael addition, producing a polyurethane polymerized high internal phase emulsion. In one embodiment, the polyurethane prepolymer is prepared by reacting diisocyanate and trimethylolpropaneallylether (TMPAE).

A method for producing a porous resin particle including a mesoporous structure portion and an outer shell portion integrally formed on a surface of the mesoporous structure portion includes, in a state that an oil-phase liquid, in which a polymerizable monomer and an oil-soluble polymerization initiator having a polymerization initiating ability to the polymerizable monomer are dissolved or dispersed in a hydrophobic solvent, is dispersed as oil droplets in an aqueous medium containing a water-soluble polymerization initiator having a polymerization initiating ability to the polymerizable monomer, generating a plurality of mesopores inside the porous resin particle by forming a solid medium, by polymerizing the polymerizable monomer by acting the oil-soluble polymerization initiator and the water-soluble polymerization initiator at the same time on the polymerizable monomer.

A polymer composition containing a polymer (B) obtained by polymerizing a monomer composition containing: a methacrylic acid ester macromonomer (b1) represented by the following formula (1); and another monomer (b2). Also, a porous membrane formed from a membrane forming polymer (A) and the aforementioned polymer composition.

##STR00001##

A method for preparing core/shell particles includes forming a suspension of ethylenically unsaturated monomer droplets containing one or more monomers and a porogen in an aqueous medium containing a first stabilizer and a polymerization initiator, wherein at least one of the monomers is a cross-linking monomer, and wherein the first stabilizer is an inorganic colloid. The method further includes polymerizing the one or more monomers to form core/shell particles having a core of a porous polymer and a polymeric shell having a shell thickness of at least 5 nm, wherein any pores in the polymeric shell have a diameter of less than 2 nm.

Build materials and methods of 3D printing are described herein. In one aspect, a build material comprises an acrylate component, a photoinitiator component, and a porogen component, wherein the porogen component is water soluble. In some embodiments, the porogen component is present in the build material in an amount of 55-75 wt. %, based on the total weight of the build material.

A polyarylethersulfone (PAES) copolymer, a process for preparing the PAES copolymer, an article such as a film, fiber, membrane or a part thereof comprising the PAES copolymer, the use of the PAES copolymer in the preparation of an article, a polymer solution comprising the PAES copolymer, and a method for using such article for aqueous medium treatment. The PAES copolymer is a random polymer which comprises at least two types of recurring units, one of which being derived from condensation of a diol and a dihalogenated alkylene oxide, while the other type of recurring units is derived from condensation of the same diol and a dihalodiphenylsulfone. The diol may be aromatic or alicyclic. The dihalogenated alkylene oxide preferably has at most 9 carbon atoms and/or at most 4 oxygen atoms.