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SBCs/PNIPAM composite material having interpenetrating polymer network structure and preparation method thereof

A technology of interpenetrating polymers and composite materials, applied in the field of SBCs/PNIPAM composite materials and their preparation, can solve the problem of restricted application range, inability to form specific shapes, and poor shape retention of poly-N-isopropylacrylamide gel materials and other issues to achieve promising results

Active Publication Date: 2018-12-07
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The polyN-isopropylacrylamide gel materials prepared in water or organic solvents have the following problems at present: (1) the polyN-isopropylacrylamide linear or cross-linked polymers of dry samples are highly brittle hard (2) The poly N-isopropylacrylamide gel material after water balance has poor shape retention ability and cannot form a specific shape, which seriously restricts its scope of application, such as CN101293939A, its Disclosed is an isopropylacrylamide polymer hydrogel and a synthesis method thereof: dissolving isopropylacrylamide, an oxidizing agent, an initiating reducing agent, and a crosslinking agent in water and reacting

Method used

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  • SBCs/PNIPAM composite material having interpenetrating polymer network structure and preparation method thereof
  • SBCs/PNIPAM composite material having interpenetrating polymer network structure and preparation method thereof
  • SBCs/PNIPAM composite material having interpenetrating polymer network structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Dissolve 0.75g of SBS and 2.25g (20mmol) of N-isopropyl acrylate in 10ml of tetrahydrofuran solvent at 30(±1)°C, and stir until the solution is uniform without volatile solvent. Subsequently, 0.5 mmol of benzoyl peroxide initiator and 1.14 mmol of ethylene glycol dimethacrylate cross-linking agent were added into the homogeneously dissolved solution, further stirred uniformly and nitrogen was blown to remove oxygen. Afterwards, the filtered mixed solution was poured into a completely sealable polytetrafluoroethylene mold and sealed, the reaction temperature was 80° C., and the polymerization time was 20 h. The synthesized product slowly evaporated the solvent at 25°C for 48h, and then placed in a vacuum environment at 40°C for 24h to remove the residual solvent. The obtained dried samples were rinsed in running water to remove unreacted substrates. After this, the product freeze-drying removes moisture, promptly obtains the final product SBS / PNIPAM composite material, ...

Embodiment 2

[0043] Replace the benzoyl peroxide in Example 1 with lauryl peroxide (amount: 0.5 mmol) as the initiator, the reaction temperature is 70°C, the polymerization time is 24h, and other conditions are unchanged, repeat the method of Example 1 to obtain SBS / PNIPAM composite.

Embodiment 3

[0045] The tetrahydrofuran solvent in Example 2 was replaced with a mixed solvent of benzene and tetrahydrofuran with a volume ratio of 1:4, and the other conditions remained unchanged. The method of Example 2 was repeated to obtain the SBS / PNIPAM composite material.

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Abstract

The invention provides an SBCs (styrene block copolymers) / PNIPAM (poly(N-isopropylacrylamide)) composite material having an interpenetrating polymer network structure and a preparation method thereof.The SBCs / PNIPAM composite material is prepared from a styrenic thermoplastic elastomer, an N-isopropyl acrylamide monomer, an initiating agent and a cross-linking agent, wherein a mass ratio of the styrenic thermoplastic elastomer to the N-isopropyl acrylamide monomer is 1 to (0.5 to 5), a molar ratio of the initiating agent to the N-isopropyl acrylamide monomer is 1 to (10 to 100), and a molar ratio of the cross-linking agent to the N-isopropyl acrylamide monomer is 1 to (5 to 50). The composite material obtained by adopting the method disclosed by the invention has temperature response similar to poly-N-isopropyl acrylamide gel, and has the mechanical supporting and shape retainability properties which are not contained in the poly-N-isopropyl acrylamide; and moreover, the SBCs / PNIPAM composite material can be widely applied to the fields of medical dressings, medicine loading and slow release, sensors and the like, and has good prospects.

Description

technical field [0001] The invention relates to a SBCs / PNIPAM composite material with an interpenetrating polymer network structure and a preparation method thereof. Background technique [0002] Poly-N-isopropylacrylamide (PNIPAM) is the most widely studied hydrogel material in the past two decades. Its linear molecular aqueous solution has a typical temperature dependence, and there will be obvious sol-gel around 30-35 °C. Transformation behavior; while its cross-linked hydrogel system shows significant volume swelling-collapse behavior around 30-35°C. Therefore, this polymer can be widely used in the fields of drug controlled release and sensor. [0003] The polyN-isopropylacrylamide gel materials prepared in water or organic solvents have the following problems at present: (1) the polyN-isopropylacrylamide linear or cross-linked polymers of dry samples are highly brittle hard (2) The poly N-isopropylacrylamide gel material after water balance has poor shape retention a...

Claims

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Application Information

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IPC IPC(8): C08L33/24C08L53/02C08F220/54C08F222/14
CPCC08F220/54C08L33/24C08L2205/04C08L53/02C08F222/102
Inventor 张爱民刘曦非
Owner SICHUAN UNIV