7 results about "Radical polymerization" patented technology

A composition includes at least one biologically active agent covalently attached to a first polymerizing molecule that is adapted to undergo a free radical polymerization. The first polymerizing molecule retains the ability to undergo free radical polymerization after attachment of the bioactive agent thereto. The first polymerizing molecule is preferably biocompatible. The polymerizing molecule can, for example. be dihydroxyphenyl-L-alanine (DOPA) or tyrosine. The composition can also include a second component synthesized by reacting at least one core molecule having a plurality of reactive hydrogen groups with at least one multi-isocyanate functional molecule to create a conjugate including terminal isocyanate groups. The conjugate molecule is reacted with a second polymerizing molecule that is adapted to undergo a free radical polymerization. The second polymerizing molecule includes a reactive hydrogen to react with the isocyanate groups of the conjugate. The second polymerizing molecule retains the ability to undergo the free radical polymerization after reaction with the conjugate. In several embodiments, the first polymerizing molecule and the second polymerizing molecule are the same and dihydroxyphenyl-L-alanine (DOPA) or tyrosine.

The invention relates to a preparation method of a self-supporting porous carbon electrode material, belonging to the technical field of electrode material preparation. The method specifically comprises the following steps: adding acrylamide, N,N'-methylene bisacrylamide, sodium carboxymethyl cellulose, potassium tetraborate and a chemical activator into water to obtain a mixed solution; then adding an initiator, and carrying out a free radical polymerization reaction at 65-75 DEG C to obtain hydrogel; freeze-drying the hydrogel to prepare xerogel; and carbonizing, washing and drying the xerogel to obtain the self-supporting porous carbon electrode material. The self-supporting porous carbon material is prepared from an acrylamide micromolecule raw material through the steps of free radical polymerization, freeze drying, carbonization and the like, the structure and performance of the prepared porous carbon can be conveniently regulated and controlled through reaction conditions, preparation process is simple, convenient and easy to control, and the obtained porous carbon electrode material is large in specific surface area and has excellent capacitance performance.

A process for polymerizing or copolymerizing ethylenically unsaturated monomers in the presence of free-radical polymerization initiators, wherein the polymerization is carried out at temperatures from 100° C. to 350° C. and pressures in the range of from 110 MPa to 500 MPa in a continuously operated polymerization reactor which is controlled by a pressure control valve at the outlet of the polymerization reactor, the process comprising continuously monitoring the pressure within the polymerization reactor, feeding a pressure signal to a controller for controlling the control valve and having the controller altering the opening of the pressure control valve to control the pressure within the polymerization reactor, wherein the controller starts an emergency shutdown program when the pressure control valve closes more than a preset threshold value and the pressure within the polymerization reactor decreases below a preset pressure threshold.

The invention relates to a fluorescence analysis method based on HCR and cation exchange reaction of hydrogel, and the method comprises the following steps: modifying a C-C double bond on the surfaceof a substrate through a silanization reaction, and constructing a PEG hydrogel array on the substrate by means of a photomask through a free radical polymerization reaction initiated by ultraviolet light; opening a hairpin structure of a capture probe modified on the hydrogel by the target molecule, initiating a hybridization chain reaction between biotinylation hairpins H1 and H2, and forming along-chain double-chain DNA at a sensing site. Through biotin-streptavidin specific binding reaction, a biotinylated quantum dot CdS is fixed to a sensing site. CdS is initiated by Ag<+> to generate cation exchange reaction, and the fluorescence of Rhod-5N is greatly enhanced by Cd2<+>. Array point fluorescence is quantified by using a gene chip scanner, so that high-sensitivity and high-specificity analysis of target molecules is realized. The method is simple to operate, low in cost, high in sensitivity, good in specificity and high in universality.

The invention belongs to the field of water-soluble high molecular materials, and in particular relates to a method for industrially preparing polyacrylamide reverse-phase emulsion. A polyacrylamide reverse-phase emulsion product is obtained by adopting a multi-step polymerization step. The method comprises the following steps: step 1, by taking acrylamide and acrylic acid or 2-acrylamido-2-methylpropanesulfonic acid as a polymerization monomer and taking Span and octylphenol polyoxyethylene ether (OP) as an emulsifier, carrying out a small amount of polymerization to prepare the polyacrylamide reverse-phase emulsion, wherein polymerization heat is less so as to ensure that implosion dangers, caused by the fact that heat is not dissipated in time, do not occur in a polymerization process; step 2, polymerizing: carrying out further polymerization on the basis of the polymerization in the step 1, wherein partial polymerization is carried out, so that polymerization heat generated by the polymerization in step 2 is greatly reduced, an implosion phenomenon does not occur, and gel or emulsion breaking is not generated in the polymerization process. In a subsequent polymerization process, the released amount is determined according to the size of a polymerization kettle and heat releasing efficiency when one part of product is released each time. By adopting the method provided by the invention, the safety of polymerization reaction is greatly improved, the large-size polymerization kettle can be utilized, and the implosion possibility does not need to be worried, so that industrial production can be stably and safely carried out.