Abstract: Disclosed is a blood-compatible polymer represented by Formula 1. A polymer obtained by grafting a fluorinated methacrylate onto a polyvinylidene fluoride copolymer and provided in one aspect of the present invention is a polymer with blood compatibility, and may provide a blood-compatible material with hydrophobicity. In addition, it is possible to provide a material with controlled contact angle and surface energy properties by controlling the hydrogen fluoride length of the fluorinated methacrylate monomer for modification. Furthermore, it is possible to provide coating with controlled surface properties and blood compatibility through a simple process. Furthermore, it is possible to provide a freestanding polymer film with blood compatibility.

Abstract: An electrostatic hydrodynamic jet writing method for writing a desired imaged using an electro-rheological fluid is disclosed wherein a writing potential for forming an electric field is applied to a nozzle of an injection head according to a writing signal to vary the viscosity of the ink flowing through the nozzle and to control the flow of the ink. Simultaneously, an accelerating potential is applied between the nozzle and an accelerating electrode on which paper is guided so as to transfer ink of lowered viscosity from the nozzle to the accelerating electrode to perform writing.

Abstract: A writing method is disclosed for an ink jet printer using an electro-rheological fluid wherein an electro-rheological fluid reservoir is provided in between static pressure tubes circuitously communicating with a larger-diameter portion and a smaller-diameter portion of a venturi tube. The pressure difference created in the venturi tube forces the injection of the electro-rheological fluid, and a writing potential is applied to the exit of the static pressure tubes from which the electro-rheological fluid is ejected so as to control the ejected amount.