Abstract:
The present invention provide methods for preparing nanostructured membranes. The methods include: providing a substrate with a charged silanized surface; forming a multilayered membrane containing at least two polyelectrolytes; inducing polyelectrolyte phase separation; crosslinking the multilayered membrane; and covalently linking the multilayered membrane to the silanized surface. Methods for fabricating membrane replicas are also disclosed, as well as devices such as cell- and tissue-culture substrates that contain the membranes and membrane replicas. Resulting materials exhibit topographic features and compliance of the extracellular matrix in vivo.
Abstract:
Coating composition comprising a liquid first phase comprising one or more polymer binder components having functional groups capable of cross-linking by electron pair exchange, and a second phase which is a powder material, such as sand, comprising one or more compounds capable of activating crosslinking of the binder components in the liquid phase after the second phase is exposed to the first phase. The activating compound in the second phase may include a Lewis acid or Lewis base. Method of applying a coating composition curable by cross-linking chemistry based on electron pair exchange, wherein after application of a layer of the coating composition on a substrate, a powder material comprising one or more cross-linking activating compounds is sprinkled over the wet layer. After sprinkling the powder material over the coating layer, a second coating layer is applied.
Abstract:
A process for repairing a vehicle coating, comprising the following steps: I) applying a UV radiation coating composition onto a coated vehicle or vehicle part, having a blemished area on the coated surface to be repaired, wherein the coating composition comprises A) at least one free-radically polymerizable oligomeric and/or polymeric binder containing olefinically unsaturated groups, B) optionally, at least one free-radically polymerizable monomeric reactive diluent containing one or more olefinically unsaturated groups, C) at least one photoinitiator, D) at least one metal compound of a metal salt containing the metal in the cation and/or anion of the compound, organometallic compounds, metal coordination compounds and mixtures thereof, wherein the metal is from groups 13-14 of the periodic system of elements and a transition metal, and is able to occur in at least 2 oxidation states other than zero and E) optionally, water, organic solvents, pigments, fillers and/or conventional coating additives, and II) irradiating the resultant coating with UV radiation.
Abstract:
A process for forming a cured paint film from a paint containing, as a binder, a resin containing a carbonyl group, or a resin, or a resin mixture containing a carbonyl group and a carboxyl group or a paint containing, as a binder, a resin containing a resin or a resin mixture containing a group which forms a carboxyl group in the subsequent contact step with a hydrazine compound or polyhydrazide compound. The uncured paint film, which contains a carbonyl group, or a carbonyl group and a carboxyl group or a group that forms a carboxyl group, is subjected to a step of curing the paint film by allowing the uncured paint film to contact with a hydrazine compound or a polyhydrazide compound.
Abstract:
Disclosed are modified spray guns, particularly electrostatic spray guns, for implementation of the vaporous amine catalyst spray method disclosed in U.S. Pat. No. 4,517,222. In particular, the present invention broadly is directed to a spray gun for spraying atomized liquid, e.g. vapor permeation curable paint, with the assistance of a vaporous amine flow via an amine flow path established in the spray gun wherein the improvement comprises a control apparatus actuable in the absence of the vaporous amine flow to cause a heated non-amine gas, preferably heated air, to flow through and purge the amine flow path within the gun for maintaining a desired flow path temperature adequate for suppressing amine condensation in the flow path. The spray gun can be a hand spray gun or an automated spray gun utilizing air atomization or mechanical atomization, operating under electrostatic spray conditions if desired. Specific techniques for implementing the purge air technique of the present invention adaptable for a variety of conventional spray guns are disclosed in detail.
Abstract:
A process for producing a fully cured, infusible coating which when applied to surfaces normally susceptible to the deposition of mineral scale substantially improves the resistance of such surfaces to mineral scale comprising, (1) applying to a substrate whose scale resistance is to be improved an acid or base catalyzed phenolic-aldehyde resin condensate containing a substantial number of reactive hydroxyl groups which are susceptible to oxyalkylation by a base catalyzed reaction with alkylene carbonate; and (2) contacting the resin condensate coated on the substrate with a catalytic quantity of basic catalyst and at least two moles of molten alkylene carbonate per mole of phenolic hydroxyl groups at a temperature ranging from about 350* to 380*F. until the surface of the coated substrate is converted into a surface with substantially improved scaleresistant properties; then (3) curing the resin until it is a fully cured, infusible coating bonded to the noramlly scalesusceptible surface.
Abstract:
A flexible and stretchable integrated electronic device includes a substrate having a stiffness gradient, wherein a rigid electronic device is embedded within the substrate. The stiffness gradient within the substrate prevents delamination at the interface between the substrate and the embedded device. The stiffness gradient is accomplished by providing at least two distinct zones in the substrate with uniform stiffness, with each zone decreasing in stiffness as in a distance from the embedded device increases, or the gradient is accomplished by having a zone with a varying stiffness.
Abstract:
Provided are processes and compositions for capturing a material of interest such as a biological, chemical, or other toxic agent on or from a surface. A method includes applying a liquid polymeric coating to a surface having a material of interest deposited thereon, encapsulating the material of interest with the composition, curing or otherwise solidifying the composition to form a polymeric coating on the surface, and optionally peeling the coating from the surface. The peeling may remove a portion or all of the material of interest from the surface. Also provided are devices that may be used in the processes provided herein.
Abstract:
The disclosure relates to a thermoset omniphobic composition (such as an omniphobic polyurethane or epoxy composition) which includes a thermoset polymer with first, second, and third backbone segments. The first, second, and third backbone segments can correspond to urethane or urea reaction products of polyisocyanate(s), amine-functional omniphobic polymer(s), and polyol(s), respectively, for omniphobic polyurethanes. Similarly, the first, second, and third backbone segments can correspond to urea or beta-hydroxy amine reaction products of polyamine(s), isocyanate-functional omniphobic polymer(s), and polyepoxide(s), respectively, for omniphobic epoxies. The thermoset omniphobic composition has favorable omniphobic properties, for example as characterized by water and/or oil contact and/or sliding angles. The thermoset omniphobic composition further has favorable barrier properties, for example with respect to water vapor and oxygen transmission as well as water absorption. The thermoset omniphobic composition can be used as a coating on any of a variety of substrates to provide omniphobic properties to a surface of the substrate. Such omniphobic coatings can be scratch resistant, ink/paint resistant, and optically clear.
Abstract:
This disclosure relates to a method for the in-situ encapsulation and/or insulation of piping using silicone-based compositions such as liquid silicone rubber materials and/or silicone foams. The method is useful for encapsulation and/or insulation of underground piping, particularly underground piping carrying high temperature (e.g., >120° C.) fluids, such as steam. The in-situ encapsulation and/or insulation may be done by inserting a hose into a pipe cavity so that a first end of the hose is remotely positioned next to the pipe and a second end of the hose is attached to a pumping system. A silicone composition is pumped through the hose and into the cavity surrounding from the remote first end of the tubing at a first predefined rate, and the hose is gradually withdrawn from the cavity at a second predefined rate. The silicone material is allowed to cure and become rigid, thereby encapsulating and/or insulating the pipe.