Dainippon Ink and Chemicals, Incorporated

Other

Kawamura Institute of Chemical Research

Husheng Zhang

Takanori Anazawa

Kazunari Sakai

Hiroshi Ebato

Yasuko Watanabe

Miyuki Miyajima

A porous material is disclosed, made of a semi IPN type polymer alloy of a crosslinked polymer (A) obtained by the crosslinking polymerization of a crosslinking-polymerizable vinyl monomer and/or oligomer (a) with a non-crosslinked polymer (D) which is soluble in a solvent (B) capable of dissolving said monomer and/or oligomer (a) therein and subjecting said crosslinked polymer (A) to gelation but is insoluble in a coagulating solution (C) which is compatible with said solvent (B) but doesn't subject said crosslinked polymer (D) to gelation. A porous material excellent in mechanical strength as well as in heat resistance can be prepared. Various functional groups can be introduced into the surface of the porous material. Further, the pore diameter can be easily controlled. The porous material of the present invention is excellent in physical properties such as strength, hardness and heat resistance as well as in chemical and biological properties such as non-adsorptivity and selective adsorptivity of protein.

Process for the preparation of porous material and porous material

Disclosed is a process for producing a material having hydrophilic surface which comprises forming a hydrophobic photopolymerizable composition comprising a hydrophobic compound (a) having two or more polymerizable unsaturated double bonds per molecule and a photopolymerization initiator into a desired form and irradiating the resultant shape (b) with actinic rays while keeping the surface of the shape (b) in contact with a hydrophilic liquid (d) containing a hydrophilic compound (c) having one or more polymerizable unsaturated double bonds under such conditions that a photopolymerization reaction is prevented from occurring in the hydrophilic liquid (d) except at the interface between the liquid (d) and the shape (b), whereby the shape (b) is cured and, at the same time, the hydrophobic compound (a) is copolymerized with the hydrophilic compound (c) at the interface between the shape (b) and the hydrophilic liquid (d) to chemically bond molecules of the hydrophilic compound (c) to the surface of the hydrophobic shape (b). The process is advantageous in that the kind and density of hydrophilic groups can be easily controlled and the structure and properties inherent in the material formed from the photopolymerizable composition are not impaired.

Process for producing material with hydrophilic surface

An asymmetric polymer membrane is disclosed characterized by being formed by irradiating a monomer and/or an oligomer polymerizable with an energy ray and having a pore diameter distribution in the thickness direction of the membrane, a ratio of a permeability flux of oxygen to nitrogen of 0.9-1.1, and communicating pores.

Asymmetric polymer membrane and preparation thereof

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Ibaraki, Japan

Husheng Zhang