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Blending polymer shape memory material and preparation method thereof

A technology of blending polymers and memory materials, which is applied in the industrial and medical fields, and can solve problems such as limiting the development of industrialization, unclear mechanism of shape memory of blending polymer systems, pre-design and optimization of process conditions, etc.

Inactive Publication Date: 2008-09-10
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, the mechanism of shape memory of the blended polymer system is still unclear, which makes it difficult to optimize the process conditions through proper pre-design
These have limited its industrial development

Method used

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  • Blending polymer shape memory material and preparation method thereof
  • Blending polymer shape memory material and preparation method thereof
  • Blending polymer shape memory material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1 SBS / PCL Shape memory blends were prepared by compounding.

[0016] Styrene, butadiene, and styrene triblock copolymer (SBS) are selected as elastomers, and polycaprolactone (PCL) is selected as the crystalline polymer of inversion phase. The weight ratio of the two is SBS:PCL=3:7. The two components were mixed with a Brabender mixer for 10 min at 180°C at a speed of 60 min -1 . Tablets were then pressed to produce tablet samples for testing. The sample details and shape memory properties are shown in Table 1.

[0017] Table 1SBS / PCL compounding sample details and shape memory properties

[0018]

[0019] attached figure 1 Polarized microstructure photographs of the samples are given. The white area is the PCL phase, which is continuously distributed; the black area is the SBS phase, which belongs to the obvious matrix phase. The SBS of the matrix phase provides good tensile properties and resilience, making the blends have good shape recovery. The c...

Embodiment 2

[0020] Example 2SBS / PCL Shape memory blends were prepared by solution blending.

[0021] SBS and PCL were simultaneously dissolved in tetrahydrofuran solvent. The weight ratio of SBS and PCL was 50:50. The total solution concentration of SBS and PCL was 10 wt%. After a little heating and stirring to be completely dissolved, the solution is poured into a specific mold, and the tetrahydrofuran is volatilized under the heating of an infrared lamp. After the tetrahydrofuran has evaporated, a sample of a specific shape is obtained. This sample was pressed into a tablet for testing. Shown in Table 2 are the sample details and shape memory properties.

[0022] Table 2SBS / PCL solution blending sample details and shape memory properties

[0023]

[0024] attached figure 2 Photographs of the polarized microstructure of the samples are given in . The white area is the PCL phase, and the black area is the SBS phase. The two phases show obvious bicontinuous phase distribution, ...

Embodiment 3

[0025] Example 3 Natural rubber / polylactic acid shape memory blend

[0026] The elastomer is selected from natural rubber after vulcanization, and the phase transition polymer is selected from amorphous polylactic acid (PLA). The weight ratio of the two is natural rubber:polylactic acid=5:5. The two components were mixed with a Brabender mixer for 10 min at 200°C, and the rotational speed was 60 min -1 . Tablets were then pressed to produce tablet samples for testing. The sample details and shape memory properties are shown in Table 3.

[0027] Table 3 Details and shape memory properties of natural rubber / polylactic acid (PLA) mixed samples

[0028]

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PUM

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Abstract

The invention belongs to the industrial and medical technical field, and particularly relates to a shape memory material and a preparation method thereof. The shape memory material is a macromolecular blend based on the incompletely compatibility between components, and comprises at least one sort of elastomer polymer and at least one sort of phase-transformation polymer, wherein the elastomer polymer component comprises any thermosetting or thermoplastic elastomer with excellent tension performance and rebound performance; and the phase-transformation polymer component comprises any polymer capable of crystallization or having obvious vitrification transformation. The preparation of the shape memory material adopts a milling method of solution or fused mass so as to ensure that the material has a uniform phase structure. Moreover, the shape memory material has excellent shape memory performance, and the shape recovery rate and the shape fixation rate of the material can be controlled through adjusting the contents of both components.

Description

technical field [0001] The invention belongs to the technical fields of industry and medical treatment, and particularly relates to a shape memory blend and a preparation method thereof. Background technique [0002] Shape memory materials now mainly refer to "thermotropic shape memory materials", which are materials whose shape can change from a shape to a temporary shape, and then return from the temporary shape to the original shape under thermal stimulation conditions. Such materials can be used in industrial fields such as reducing pipe joints, thermal sensors, food packaging, etc., and can also be used in medical fields such as surgical sutures, fracture fixation plates, etc. [0003] There are two main parameters for evaluating the performance of shape memory materials. One is the shape recovery rate, which measures the degree of shape recovery. The other is the shape fixation rate, which measures the effect of the temporary shape retention after deformation into a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L53/02C08L67/04C08L7/00C08L75/04C08L47/00C08J3/00C08L23/16C08L9/06C08L9/02C08L23/08C08L23/06C08L25/06
Inventor 张恒钟伟杜强国
Owner FUDAN UNIV
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