Silica cross-linking shape memory polymer material

A memory polymer and silica technology, applied in the field of shape memory polymer materials, can solve the problems of weak bonding force and few chemical bonding points, and achieve the effects of improved mechanical properties, high mechanical strength, and good shape memory performance.

Active Publication Date: 2012-05-30
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 size of about 140nm, add 5.6979g ε-caprolactone, and ultrasonically disperse for 3 hours to obtain uniform dispersion The clear colloidal fluid. Add 2% of initiator stannous octoate, in N 2 Stirring and reacting at 130℃ for 20h under the conditions to obtain SiO with high viscosity 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 monomers, and vacuum dry at 45°C to obtain SiO with a particle size of about 400nm 2 PCL spherical polymer particles. Weigh 2g of SiO 2 PCL is dissolved in 20g DMF, in N 2 1g of MDI was added 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 memory polymer material with a thickness of 200-400 ...

Embodiment 2

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

[0036] According to the method of Example 1, the shape fixation rate and shape recovery rate were tested. When the deformation is 100%, R 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 silica particles prepared in Example 1, weigh 0.1g of 140nm silica particles and 7.5968g of ε-caprolactone respectively, and prepare SiO as in Example 1. 2 PCL polymer pellets (with a particle size of about 700nm) are added to MDI to react and then cast.

[0039] According to the method of Example 1, the shape fixation rate and shape recovery rate were tested. When the deformation is 100%, R 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 present invention relates to a shape memory polymer material, in particular, the present invention relates to a shape memory polymer material formed by using silica 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 material refers to a type of material that can change shape when stimulated by external conditions, maintain a specific temporary deformation, and return to its original shape when external conditions change. Shape memory polymer (SMP) has many advantages such as large deformation, low cost, easy processing, etc. and has attracted much attention. Among them, the thermotropic SMP has been widely studied due to its wide adjustable range of deformation temperature, wide material sources and wide application range. Its shape memory mechanism is: it consists...

Claims

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Application Information

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Patent Type & Authority Applications(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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