Abstract:
The invention concerns a method for producing a superhydrophobic membrane or surface coating of a substrate from an aqueous phase comprising the following steps: a) Preparing an aqueous dispersion by dispersing particles of hydrophobic polymer(s) in an aqueous solution of protic polymer(s), wherein the protic polymer(s) and the hydrophobic polymer(s) are present in a weight ratio of protic polymer(s) : hydrophobic polymer(s) in a range of 5 : 95 to 22 : 78, b) electrospinning the dispersion of step a) onto a carrier for producing the membrane or onto the surface for producing the surface coating thereby producing at least one fiber and a nonwoven fabric from the fiber, c) subjecting the nonwoven fabric to a sol-gel process, wherein a precursor/precursors of the sol-gel comprise(s) an alkoxysilane, and d) curing the nonwoven fabric obtained by step c) at a temperature in a range of 50°C to 150°C.
Abstract:
A thermoplastic copolymer that includes a first divalent unit having a pendent ultraviolet absorbing group and a second divalent unit that is fluorinated. A fluoropolymer composition including the thermoplastic copolymer is also disclosed.
Abstract:
A broadly applicable method requiring no more than a single step facilitates the preparation of large area super hydrophobic or super hydrophilic surfaces on a variety of substrates such as such as glass, metal, plastic, paper, wood, concrete and masonry. The technique involves the free radical polymerization of common acrylic or styrenic monomers in the presence of porogenic solvents in a mold or on a free surface. The material can be semi- or fully- transparent and either super hydrophobic or super hydrophilic depending on the choice of the monomers. Because porosity and dual scale roughness are intrinsic bulk properties of the monolithic materials and not only a surface characteristic, the polymers can be powdered to produce a super hydrophobic powder or otherwise fragmented and attached to the surface of any object to render it super hydrophobic or super hydrophilic. The surface properties of the porous material may also be altered locally by photografting with selected monomers.
Abstract:
This invention is directed toward surface treatment of a device. The surface treatment comprises the placing of surface active segmented block copolymers to the surface of the substrate. The present invention is also directed to a surface modified medical device, examples of which include contact lenses, intraocular lenses, vascular stents, phakic intraocular lenses, aphakic intraocular lenses, corneal implants, catheters, implants, and the like, comprising a surface made by such a method.
Abstract:
This invention is directed toward surface treatment of a device. The surface treatment comprises the attachment of reactive segmented block copolymers to the surface of the substrate by means of reactive functionalities of the terminal functionalized surfactant material reacting with complementary surface reactive functionalities in monomeric units along the polymer substrate. The present invention is also directed to a surface modified medical device, examples of which include contact lenses, intraocular lenses, vascular stents, phakic intraocular lenses, aphakic intraocular lenses, corneal implants, catheters, implants, and the like, comprising a surface made by such a method.
Abstract:
A body having a lubricant reservoir is described, comprising: a porous polymeric body; and a lubricating liquid, said lubricating liquid occupying the pores to provide a lubricated porous surface having a lubricant reservoir and a lubricant overlayer over the polymer surface. Also described herein is a system for use in the formation of a low-adhesion and low-friction surface includes a flowable precursor composition comprising a prepolymer and a curing agent, said composition capable of application as a coating over a large surface area; a lubricating liquid that is capable of forming a coating with the hardened precursor composition, wherein the lubricating liquid and hardened polymer together form a coating of lubricating liquid stabilized on and in the hardened polymer; and instructions for applying the precursor composition onto a surface for the purpose of obtaining a low-adhesion and low-friction surface.
Abstract:
A body having a lubricant reservoir is described, comprising: a porous polymeric body; and a lubricating liquid, said lubricating liquid occupying the pores to provide a lubricated porous surface having a lubricant reservoir and a lubricant overlayer over the polymer surface. Also described herein is a system for use in the formation of a low-adhesion and low-friction surface includes a flowable precursor composition comprising a prepolymer and a curing agent, said composition capable of application as a coating over a large surface area; a lubricating liquid that is capable of forming a coating with the hardened precursor composition, wherein the lubricating liquid and hardened polymer together form a coating of lubricating liquid stabilized on and in the hardened polymer; and instructions for applying the precursor composition onto a surface for the purpose of obtaining a low-adhesion and low-friction surface.
Abstract:
Procédé de traitement de formations rocheuses souterraines ou non et plus particulièrement de puits producteurs à huile ou à gaz, de puits injecteurs d'eau visant à balayer les réservoirs d'hydrocarbures (huile ou gaz) ou de puits de gaz de mine ou de puits de stockage de gaz caractérisée en ce qu'il comprend une étape d"injection dans sur ladite formation rocheuse ou dans ledit puits, du microgel obtenu par dilution dans l'eau d'un latex inverse auto-inversible, ou d'un micro latex inverse auto-inversible d'un polyélectrolyte réticulé, obtenu par copolymérisation en présence d'un agent de réticulation, d'acide 2-méthyl 2-[(1-oxo 2-propènyl) amino] 1-propanesulfo nique libre, partiellement, ou totalement salifiée, d'au moins un monomère cationique choisi parmi le chlorure de 2,N,N,N-tétraméthyl 2-[(1-oxo 2-propènyl) amino] propanammonium, le chlorure de N,N,N-triméthyl 3-[(1-oxo 2-propènyl) amino] propanammonium, le chlorure de diallyl diméthylammonium, le chlorure de N,N,N-triméthyl 2-[(1-oxo 2-propènyl)] éthanammonium, le chlorure de N,N,N-triméthyl 2-[(1-oxo 2- méthyl 2-propènyl)] éthanammonium, le chlorure de N,N,N-triméthyl 3-[(1-oxo 2-méthyl 2-propènyl) amino] propanammonium et d'au moins un monomère neutre choisi parmi l'acrylamide, le N,N-diméthyl acrylamide, le N-[2-hydroxy 1,1-bis(hydroxyméthyl)éthyl] propénamide, ou l'acrylate de (2-hydroxy éthyle).