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Silica cross-linking shape memory polymer material

A technology of memory polymer and silicon dioxide, which is applied in the field of shape memory polymer materials, can solve the problems of less chemical bonding points and weak bonding force, and achieve high mechanical strength, improved mechanical properties, and improved mechanical strength.

Active Publication Date: 2013-12-11
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the addition of rigid materials improves the mechanical strength of SMP to a certain extent, such methods are only based on partial modification of the additive surface, with few chemical bonding points and weak bonding force, and there are still big problems in compatibility and dispersion.

Method used

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  • Silica cross-linking shape memory polymer material
  • Silica cross-linking shape memory polymer material
  • Silica cross-linking shape memory polymer material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of silica cross-linked shape memory polymer (140nm silica particles): Weigh 0.1g of silica particles with a particle diameter of about 140nm, add 5.6979gε-caprolactone, and ultrasonically disperse for 3 hours to obtain a uniform dispersion clear colloidal fluid. Add 2% initiator stannous octoate, in N 2 Stirring and reacting at 130°C for 20 hours under the same conditions, SiO with high viscosity was obtained 2 PCL polymer, dissolve the polymer with dichloromethane, filter to remove impurities, add n-hexane to precipitate white polymer powder, wash and filter to remove unreacted monomer, and obtain SiO with a particle size of about 400nm after vacuum drying at 45°C 2 PCL spherical polymer particles. Weigh 2g of SiO 2 PCL was dissolved in 20gDMF, in N 21 g of MDI was added at low temperature, stirred and reacted at 80°C for 2 hours to obtain a white emulsion, which was cast in a polytetrafluoroethylene mold at 80°C to remove the solvent to obtain a shape-...

Embodiment 2

[0035] Preparation of silica cross-linked shape memory polymer (370nm silica particles) and material characterization and shape memory performance test: select 370nm silica particles, follow-up steps are the same as in Example 1, first synthesize SiO 2 PCL polymer pellets (with a particle size of about 2 μm) were added into MDI for reaction and then cast in a glass mold, and dried at 80° C. to remove the solvent.

[0036] The shape fixation rate and shape recovery rate were tested by the method of Example 1. R at 100% deformation f and R r Both are 100%, and when the deformation is 300% and 500%, R f and R r After the second cycle, it can reach more than 95%.

Embodiment 3

[0038] According to the 140nm silicon dioxide particles prepared in Example 1, weigh the 140nm silicon dioxide particles of 0.1g respectively, and in the ε-caprolactone of 7.5968g, prepare SiO as in Example 1 2 PCL polymer pellets (particle size about 700nm), then add MDI to react and then cast.

[0039] The shape fixation rate and shape recovery rate were tested by the method of Example 1. R at 100% deformation f and R r Both are 100%, and when the deformation is 300% and 500%, R f and R r After the second cycle, it can reach more than 99%.

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Abstract

The invention discloses a silica cross-linking shape memory polymer material, characterized by using silica as a cross-linking point, forming a SiO2@polymer spherical polymer in which silica is used as the shell of the core polymer through surface grafting of a polymer, and connecting polyisocyanate with the terminal hydroxy of the polymer to obtain a polymer having a cross-over network structure, wherein the soft segment is a polymer whose surface is grafted by silica, and the hard segment comprises silica and a urethane chain segment. The silica cross-linking shape memory polymer material has the advantages of regular structure, high mechanical strength, stable shape memory performance, and high shape memory fixation rate and shape memory recovery rate, and can be applied for materials in medical science and other aspects.

Description

technical field [0001] The invention relates to a shape-memory polymer material, in particular, the invention relates to a shape-memory polymer material formed by using silicon dioxide inorganic particles as crosslinking points. The shape memory polymer material has high mechanical properties at room temperature to 80° C., and has stable shape fixation rate and shape recovery rate. Background technique [0002] Shape memory materials refer to a class of materials that can change shape when stimulated by external conditions, and maintain a specific temporary deformation, and can return to the original shape when the external conditions change. Shape memory polymer (SMP) has attracted much attention due to its many advantages such as large deformation, low cost and easy processing. Among them, thermotropic SMP has been extensively studied due to its wide adjustable range of deformation temperature, wide range of material sources, and wide application range. Its shape memory ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/42C08G63/08C08K3/36C08L75/06
Inventor 王齐华张耀明
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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