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Polymer macroporous hydrogel with rapid temperature and pH dual sensitivity and preparation method thereof

A dual-sensitivity, polymer-based technology, applied in the field of hydrogels, can solve problems not related to temperature and pH response

Active Publication Date: 2020-01-31
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The preparation method of polyvinyl acetal-based foam material was first seen in the British patent GB 573966 (A), and later many patents in the United States further refined its preparation technology (such as: US patents US2664366, US3034999, US2636013). In recent years, Chinese patents CN101507826, CN1095387, CN1557872) reported the material preparation technology, wherein the Chinese patents CN101507826, CN103709275A, CN103709276A, CN102924745A and CN102924744B prepared polyvinyl alcohol-based foam materials have a higher open cell ratio, respectively have fast and efficient absorption and adsorption properties, but the prepared samples were not characterized by temperature and pH responses

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 100g degree of polymerization is 2000, alcoholysis degree is 98% polyvinyl alcohol is dissolved in 900g hot water and is made into the solution that mass percent is 10%, adds 20g polyoxyethylene sorbitan monolaurate, 20g lauryl Sodium alkylbenzene sulfonate, 70ml of formaldehyde solution, add 30g of potato starch, mix evenly and pour into a blender, stir for 20min, then add 500mL of sulfuric acid with a mass percentage of 50%, and continue stirring for 20min. Pour the above liquid into an acid-resistant mold, put it into a constant temperature box, react at 40°C for 24 hours to solidify and form, wash and dry to obtain a polyvinyl acetal foam material.

[0037] Add 100mL of water, 2g of the above-prepared polyvinyl acetal foam material (10 small pieces, 0.2g each), 0.01mol of dimethylaminoethyl methacrylate (DMAEMA), and then add 0.5mmol of supernatant to a 500mL two-necked flask. Potassium sulfate (KPS), 0.005mmol ammonium ferrous sulfate hexahydrate, sealed, reacted a...

Embodiment 2

[0041] In the 500mL two-necked flask, add the sulfuric acid solution of 100mL 0.001mol / L, the polyvinyl acetal foam material (10 pieces, every piece 0.2g) that 2g embodiment 1 prepares, 0.1mol dimethylaminoethyl methacrylate ( DMAEMA), then add 1mmol potassium persulfate (KPS), 0.01mmol ferrous ammonium sulfate hexahydrate, seal, react at 50°C for 12h, wash the sample with distilled water until neutral, dry in a vacuum oven to constant weight, and obtain Polyvinyl acetal foam grafted with polydimethylaminoethyl methacrylate (PVF-g-PDMAEMA-2).

[0042] The same method as in Example 1 was used to test the saturation absorption capacity of the sample in deionized water at different temperatures and in buffer solutions with different pH values. The saturated water absorption in deionized water at different temperatures is 15.5, 14.8, 13.7, 12.8 and 11.9 g g -1 , has a certain temperature sensitivity. The saturated liquid absorption at different pH values ​​are 25.3 and 18.7 g·g ...

Embodiment 3

[0044] In the 500mL two-necked flask, add the nitric acid solution of 100mL 0.01mol / L, the polyvinyl acetal foam material (10 pieces, every 0.2g) that 2g embodiment 1 prepares, 1mol dimethylaminoethyl methacrylate (DMAEMA ), then add 2mmol potassium persulfate (KPS), 0.02mmol ferrous sulfate, seal, react at 65°C for 6h, wash the sample with distilled water until neutral, dry in a vacuum oven to constant weight, and obtain polymethacrylic acid Dimethylaminoethyl ester grafted polyvinyl acetal foam (PVF-g-PDMAEMA-3).

[0045] The same method as in Example 1 was used to test the saturation absorption capacity of the sample in deionized water at different temperatures and in buffer solutions with different pH values. The saturated water absorption in deionized water at different temperatures is 17.4, 16.4, 15.0, 13.7 and 12.7 g g -1 , has a certain temperature sensitivity. The saturated liquid absorption at different pH values ​​are 30.4 and 19.6 g·g -1 , is pH responsive. Abs...

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PUM

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Abstract

The invention provides a polymer macroporous hydrogel with rapid temperature and pH dual sensitivity and a preparation method thereof. The method comprises the following steps: grafting dimethylaminoethyl methacrylate to the surface of a polyvinyl formal foam material in an acidic aqueous solution or an aqueous solution in the presence of an initiator by adopting a redox-initiated polymerization mode to obtain the polymer macroporous material with rapid temperature and pH dual sensitivity; the initiator is a water-soluble redox initiation system, wherein an oxidizing agent in the water-solubleredox initiation system is selected from potassium persulfate and / or ammonium persulfate; and a reducing agent is selected from ferrous sulfate and / or ammonium ferrous sulfate hexahydrate. Accordingto the invention, the specific redox system is adopted to initiate graft polymerization of the dimethylaminoethyl methacrylate in the macroporous polyvinyl formal, so that the obtained hydrogel has dual response characteristics of rapid temperature and pH value. The method is mild in reaction condition, simple, convenient and feasible, and short in preparation period, so that large-scale preparation is easy.

Description

technical field [0001] The invention belongs to the field of hydrogel technology, and in particular relates to a polymer macroporous hydrogel with rapid temperature and pH dual sensitivity and a preparation method thereof. Background technique [0002] The smart polymer gel is composed of a three-dimensional polymer network and a solvent, which swells but does not dissolve in the solvent. With the stimulation of environmental factors such as temperature, pH, ionic strength, light, electric field, pressure, magnetic field and enzymes, reversible and discontinuous volume changes occur, which can be used in drug controlled release, tissue culture, energy conversion devices, artificial muscles, chemical Fields such as valves and bionic actuators have great application prospects. [0003] Environmental changes are usually the result of two or more factors, such as temperature / pH, light / pH, and light / magnetism, etc. Using two or more mechanisms to regulate hydrogels is more suita...

Claims

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Application Information

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IPC IPC(8): C08J9/40C08L29/14
CPCC08J9/405C08J2329/14C08J2403/02
Inventor 石凯姬相玲许玖多沙迪王宝龙杨旭
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI