Thermal shape memory gel material and its prepn

A gel material and memory technology, applied in the field of thermal shape memory gel material and its preparation, can solve the problems of small adjustment range, lack of effective means for the complexity of the copolymerization reaction, and the inability to purposefully adjust the shape memory temperature of the material, etc. , to achieve the effect of wide deformation response temperature, simple preparation process and good biocompatibility

Inactive Publication Date: 2004-03-17
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] This thermal shape memory gel is a copolymerized gel, its composition is affected by the reactivity of the comonomer, and the range of selection and adjustment is small; the crystal region that plays a decisive role in the thermal shape memory ability of the gel material The transformation of the amorphous region is greatly affected by the composition of the copolymerization product, but the complexity of the copolymerization reaction makes it lack of effective means to control the formation of this region; thus the shape memory temperature of the material cannot be adjusted purposefully

Method used

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  • Thermal shape memory gel material and its prepn
  • Thermal shape memory gel material and its prepn

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Embodiment 1

[0019] The polyelectrolyte gel network was synthesized in deionized water, mixed with equal concentrations of acrylic acid and acrylamide aqueous solution, with 1 mol% potassium persulfate as the initiator, 1 mol% methylenebisacrylamide as the crosslinking agent, and polymerized at 60 ° C for 24 Hours, a colorless transparent polyacrylic acid-co-acrylamide gel was obtained.

[0020] After immersing the gel in deionized water to reach swelling equilibrium, take it out, and put it into the cetyltrimethylammonium bromide aqueous solution of the same concentration as the acrylic acid solution for compounding. After the compounding is complete, dry the compound gel at room temperature When the weight percentage of water is less than 30%, the shape memory gel with a memory temperature of 80° C. can be obtained, and the deformation recovery rate can reach 85%.

Embodiment 2

[0022] Synthesize multi-component polyelectrolyte gel network in organic solvent, mix equal concentrations of 2-methyl-2-acrylamido propane sulfonate and methyl methacrylate in dimethyl sulfoxide solution, add 1mol% azo Diisobutyronitrile was used as the initiator, 1mol% methylenebisacrylamide was used as the cross-linking agent, and it was polymerized at 60°C for 24 hours to obtain colorless and transparent polysodium 2-methyl-2-acrylamidopropanesulfonate-co- Methyl methacrylate gel.

[0023] Immerse the gel in deionized water to wash away dimethyl sulfoxide, fully swell to swelling equilibrium, take it out, and put it into cetyl Composite in an aqueous solution of trimethylammonium bromide, after complete compounding, dry the composite gel at room temperature to constant weight (water content is 0%), and obtain a shape-memory gel with a deformation temperature of 104°C and a deformation recovery rate Up to 80%.

Embodiment 3

[0025] The polyelectrolyte gel network was synthesized in deionized water, 1 mol% potassium persulfate and 1 mol% methylenebisacrylamide were added to 1mol / L acrylic acid aqueous solution, and polymerized at 60°C for 24 hours to obtain a colorless transparent polyacrylic acid gel.

[0026] Immerse the gel in deionized water to reach swelling equilibrium, take it out, and put it into the cetyltrimethylammonium bromide aqueous solution of the same concentration as the acrylic acid solution for compounding. After the compounding is complete, dry the compound gel at room temperature When the weight percentage of water is less than 30%, the shape memory gel with a deformation temperature of 97° C. can be obtained, and the deformation recovery rate can reach 65%.

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Abstract

The present invention discloses a new thermal shape memory gel material and its preparation method. Said material is a composite material formed from polyelectrolyte gel network and cationic surface active agent, in which the material for synthesizing the described polyelectrolyte network includes anionic electrolyte and cross-linking agent. Its synthesis and processing method are simple, its shape memory temp. can be regulated and controlled by means of monomer or composition for synthesizing polyelectrolyte gel and surface active agent. Said invented material can be used as clinical surgical material, building sleeve material, functional packaging material and information storage material.

Description

technical field [0001] The invention relates to a thermotropic shape memory gel material and a preparation method thereof. Background technique [0002] Thermally induced shape memory polymer material refers to a polymer material that deforms at a certain temperature and can be fixed at room temperature and maintain most of the deformation for a long time. When the temperature is raised to a specific response temperature, it can quickly return to the shape before deformation. . This shape memory material adopts temperature control and is easy to prepare and process. It is currently the most active field in the research and development of shape memory polymers. [0003] Thermotropic shape memory polymer materials usually have a two-phase structure, that is, a stationary phase that remembers the initial state and a reversible phase that can reversibly solidify and soften with temperature changes. Polyisoprene (TPI) (Yao Wei, Song Jingshe, He Aihua, etc.; Elastomer, 1995, 5(4...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L101/12
Inventor 关英徐坚陈强叶美玲施良和
Owner INST OF CHEM CHINESE ACAD OF SCI
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