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PH sensitive shape memory material and preparation method thereof

A memory material, sensitive technology, applied in the field of shape memory materials

Inactive Publication Date: 2012-05-09
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the defects that the existing pH-sensitive shape memory materials have relatively simple deformation behavior, and the initial shape and temporary shape of the material cannot be designed arbitrarily, the purpose of the present invention is to propose a host-guest recognition based on cyclodextrin that is different from the existing response mechanism pH-sensitive shape memory materials, which have design and plasticity properties similar to temperature-sensitive shape memory materials

Method used

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  • PH sensitive shape memory material and preparation method thereof
  • PH sensitive shape memory material and preparation method thereof
  • PH sensitive shape memory material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0033] α-cyclodextrin was grafted on polyacrylic acid (Mw=240,000) with a grafting rate of 15%; at the same time, ethylenediamine was grafted on polyacrylic acid with a grafting rate of 30%. Prepare 10% solutions respectively, mix the two solutions to activate the carboxyl group, add cross-linking agent ethylenediamine, and stir at room temperature for 12 hours. Evaporated naturally, rinsed and dried to obtain a pH-sensitive shape memory material.

[0034] After testing, the deformation fixation rate of the product is 80%, and the recovery rate is 58%.

Embodiment 2

[0036] β-cyclodextrin is grafted on chitosan (deacetylation degree above 80%), and the grafting rate is 10%; at the same time, diethylenetriamine is grafted on the chitosan, and the grafting rate is 30%. Prepare 0.5% solutions respectively, mix the two solutions, add the cross-linking agent glutaraldehyde, and stir at room temperature for 12 hours. Evaporated naturally, rinsed and dried to obtain a pH-sensitive shape memory material.

[0037] After testing, the deformation fixation rate of the product is 90%, and the recovery rate is 62%.

Embodiment 3

[0039] Beta-cyclodextrin is grafted on chitosan (deacetylation degree more than 80%), grafting rate is 9%, is made into 1% solution; Simultaneously cinnamic acid is coupled in branched polyethyleneimine ( Mw=10,000), the graft ratio was 30%. Prepare a 20% solution, mix the two solutions to activate the carboxyl group, add the cross-linking agent glutaraldehyde, and stir at room temperature for 12 hours. Evaporated naturally, rinsed and dried to obtain a pH-sensitive shape memory material.

[0040] After testing, the product has a fix rate of 88% and a response rate of 68%.

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Abstract

The invention discloses a pH sensitive shape memory material and a preparation method thereof. The shape memory material is hydrogel consisting of a cyclodextrin-containing polymer and a polymer containing a guest component which performs host-guest identification with the cyclodextrin and being formed through molecular chain cross linking, wherein a fixed cross linking point which does not change with a pH value of the environment and a reversible cross linking point which changes with the pH value of the environment are formed on the molecular chain of the hydrogel, the reversible cross linking point is formed by the cyclodextrin serving as a host component and a radical or molecule which performs host-guest identification with the cyclodextrin to generate inclusion or inclusion resolution and serves as the guest component. The preparation method comprises the following steps of: respectively grafting the cyclodextrin host component and the guest component which performs response identification with the cyclodextrin host component on a macromolecular chain to prepare a solution; performing cross linking to a macromolecule; volatilizing the solvent after cross linking to obtain the pH sensitive shape memory material. The pH sensitive shape memory material disclosed by the invention adds a fire-new branch for the polymer shape memory material, so that the response mode of the polymer shape memory material is enlarged.

Description

technical field [0001] The invention relates to a shape memory material, more specifically a novel shape memory material sensitive to pH and a preparation method thereof. Background technique [0002] The so-called shape memory material is a stimulus-responsive material, which refers to the ability to sense the stimulus of environmental changes (such as temperature, light, electricity, solvent, etc.), respond to it, and adjust its state parameters to return to the preset shape. of a material. This unique memory characteristic of its initial shape has made shape memory materials attract great attention since their inception, and have been widely used in aerospace, medical, energy and other cutting-edge fields soon. For example, scientists at the Jet Propulsion Laboratory (JPL) in the United States have been working since 1999 to develop a self-deploying structure called CHEM for various antennas, soft landing pads, solar panels, wheels for landing robots, and even aircraft. ...

Claims

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Application Information

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IPC IPC(8): C08L5/16C08J3/24
Inventor 张晟韩晓娟李帮经
Owner SICHUAN UNIV