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Shape memory polyurethane material produced from trans-polysioprene

A polyurethane material and polyisoprene technology, applied in the field of shape memory materials, can solve the problems of complex preparation steps and harsh reaction conditions, and achieve the effects of excellent electrical insulation performance and excellent hydrolysis resistance.

Inactive Publication Date: 2003-04-09
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction conditions required for anionic polymerization are very harsh and the preparation steps are complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The polyurethane designed in this example has a soft segment content of about 70%. According to this formula, the hydroxylated trans-polyisoprene (number average molecular weight is about 12,000) is dissolved in toluene, under constant stirring 2,4-toluene diisocyanate (relative molecular weight: 174.2) was added, and then the reaction was maintained at 80° C. for 20 minutes, and then 1,4-butanediol was added for chain extension. The polyurethane solution thus synthesized is cast on a tetrafluoroplastic plate to form a film, and the polyurethane film is obtained after drying.

[0038] The deformation recovery rate is characterized by measuring the relaxation behavior of the sample: on a universal material testing machine Instron 1121 with a heating chamber, the sample is heated to 65°C within 5 minutes at room temperature, and then stretched at 10mm / min Stretch at a certain rate, then fix the clamp, cool the temperature rapidly to room temperature, stay at this temperat...

Embodiment 2

[0040] The polyurethane designed in this example has a soft segment content of about 70%. According to this formula, the hydroxylated trans polyisoprene (number average molecular weight is about 5000) is dissolved in toluene, and the subsequent steps are the same as in Example 1. . The synthesized polyurethane solution was cast into a film, and the solvent was removed under heating conditions to obtain a polyurethane sample.

[0041] Test the deformation recovery rate by the method of Example 1. In order to observe the shape memory performance of the polyurethane sample after repeated use, for the same sample, repeat the process described in Example 1, perform multiple relaxation cycles, and obtain the average value of the deformation recovery rate of each relaxation cycle.

Embodiment 3

[0043] The polyurethane formulation designed in this example has a soft segment content of about 50%. According to this formulation, the hydroxylated trans polyisoprene (number average molecular weight is about 5000) is dissolved in toluene, and dibutyltin dilaurate is added (DBTDL) is used as a catalyst, and the dosage is 0.06% of the mass of the soft segment. Then 2,4-toluene diisocyanate (TDI) was added over 90 minutes, followed by the slow addition of 1,4-butanediol. The polyurethane solution thus synthesized is cast on a tetrafluoroplastic plate to form a film, and the polyurethane film is obtained after drying.

[0044] Test the deformation recovery rate by the method of Example 1. In order to observe the shape memory performance of the polyurethane sample after repeated use, for the same sample, repeat the process described in Example 1, perform multiple relaxation cycles, and obtain the average value of the deformation recovery rate of each relaxation cycle.

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Abstract

The present invention belongs to the field of shape memory polyurethane material technology and is especially shape memory polyurethane material prepared with trans-polyisoprene as basic material and through chemical modification. The components include hydroxylated trans-polyisoprene, diisocyanate and chain extender. The shape memory polyurethane material after being hot stretched and cooled to fix in shape may be restore its initial shape through heating. It has a shape memory temperature of 40-80 deg.c and deformation restoring rate of 80-100%, which is greater than 85% and may be maintained in the relative deformation up to 100%. The material of the present invention may be used as surgical material, cable casing, building pipe containing union, sealing ring temperature control element.

Description

technical field [0001] The invention belongs to the technical field of shape memory materials, in particular to a polyurethane material with shape memory function prepared from trans polyisodiene. Background technique [0002] Shape memory polymer refers to a polymer that has an initial shape, and after being deformed and fixed, the external conditions can be changed by heating or other methods to restore the original shape. The external stimuli for realizing the shape memory effect include physical factors such as heat energy, light energy, and electric energy, as well as chemical factors such as pH, phase transition reaction, and chelation reaction. Shape memory polymers are thus divided into thermally induced, photosensitive, and Chemosensitive etc. Thermotropic shape memory polymers are widely used in the fields of biomedical materials, sealing materials, and temperature control materials. [0003] Thermotropic shape memory polymers are composed of two phase states: (1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/26C08G18/72
Inventor 倪秀元孙孝辉董嶒
Owner FUDAN UNIV
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