4results about How to "Stimulus responsive" patented technology

The invention belongs to the technical field of oil exploitation foam plugging agents, and particularly relates to nano-modified CO2 multi-chain alkyl amidine, a CO2 response foam plugging agent, a preparation method and application. The CO2-responsive multi-chain alkyl amidine provided by the invention is obtained by electrostatic adsorption of an active adsorption center (tertiary carbon or tertiary nitrogen) of the multi-chain alkyl amidine and part of negatively charged nano silicon dioxide-calcium carbonate, is sensitive in stimulation response to CO2, has good foaming amount, foam stability and temperature and salt resistance, is environment-friendly and easy to degrade, and has a good application prospect. The foam plugging agent can avoid pollution of an oil layer and plugging of a stratum and can be used for preparing a CO2 response foam plugging agent.

The invention relates to a cellulose graft polymer hydrogel with multiple stimulation responsiveness and a preparation method thereof, and the hydrogel is obtained by initiating polymerization of acrylamide, 7-acrylamido-4-methylcoumarin (AAMC), hydroxypropyl methyl cellulose acetoacetate (HPMCAA) and N, N '-methylene bisacrylamide in the presence of an initiator potassium persulfate; the hydroxypropyl methyl cellulose acetoacetate is obtained by modifying hydroxypropyl methyl cellulose by using tert-butyl acetoacetate. The phase transition temperature of the hydrogel can be controlled and adjusted within the range of 25-60 DEG C; the fluorescence intensity of the hydrogel is in negative correlation with the pH value; and the properties show excellent reversibility and stability under multiple external environment stimulation cycles.

The invention discloses a structured liquid drop and a preparation method and application thereof, the structured liquid drop comprises an interfacial film and a first solution, the first solution is placed in a cavity enclosed by the interfacial film, the structured liquid drop is dispersed in a second solution, and the second solution and the first solution are immiscible; and when the structured liquid drop is extruded by external force smaller than a threshold value, the shape of the structured liquid drop is changed. According to the preparation method disclosed by the invention, the water-soluble star-shaped beta-cyclodextrin polymer with a clear structure is taken as an assembly element, no high-molecular ligand is needed, and the interface assembly of the star-shaped beta-cyclodextrin polymer is induced by directly utilizing the interaction between the star-shaped beta-cyclodextrin polymer and the oil-phase solvent; an assembly body with excellent mechanical strength is constructed on a water-oil interface in situ, and preparation of the structured liquid drops is realized by combining external field action.

This invention provides a polyurethane, its preparation method, and its applications. The polyurethane has the following structure: where n is 5-500. The polyurethane of this invention exhibits both narrow dispersibility and good biocompatibility, thus it can be used as a medical and health material and food packaging, and has potential application value in fields such as drug delivery, gene transfer, tissue engineering, and regenerative medicine.