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Rapid self-repairing shape memory polymer and preparation method thereof

A memory polymer and self-healing technology, applied in the field of shape memory polymers, can solve the problems of high brittleness and affecting the circulation of shape memory polymers, etc., and achieve the effect of fast movement and short shape recovery time

Active Publication Date: 2017-08-08
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Normally, thermotropic shape memory polymers are plastic and highly brittle. Therefore, during the large-scale shape fixation process, a large number of microcracks will be generated at the corners of the folds. These microcracks cannot disappear during the deformation recovery process. Circularity in the use of shape memory polymers
[0004] In recent years, the Brownian motion of polymer chains, metal coordination bonds, hydrogen bonds, van der Waals forces, π-π stacking, Diels-Alder reactions, etc. have been used to achieve polymer self-healing. There is still relatively little research on shape memory polymers

Method used

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  • Rapid self-repairing shape memory polymer and preparation method thereof
  • Rapid self-repairing shape memory polymer and preparation method thereof
  • Rapid self-repairing shape memory polymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Stir and dissolve PCL-diol with a number average molecular weight of 2000 in dichloromethane to obtain a uniform solution; add HDI, HPED, TEA in turn to the dichloromethane solution of PCL-diol, protect with nitrogen, and stir at room temperature for 8-10min , and then the temperature was raised to 40-50° C., kept for half an hour, and the dichloromethane solvent was removed.

[0031] Place the above mixed solution in a vacuum oven and vacuumize for 5-10 minutes to remove excess air bubbles in the mixed solution; then pour the mixed solution into a polytetrafluoroethylene mold, place it in an oven, protect it with nitrogen, and slowly heat up. Keep at 30°C for 1h, 50°C for 1h, 70°C for 1h, 90°C for 1h, and finally 110°C for 1h. Then the above product is cooled, demoulded, and set aside.

[0032] The mol ratio of HDI, PCL-diol, HPED, TEA is in this embodiment:

[0033] 2·n DIM : 2·n PCL-diol : 4 n HPED : 3 n TEA =12:8:3:1

Embodiment 2

[0035] Stir and dissolve PCL-diol with a number average molecular weight of 5000 in dichloromethane to obtain a uniform solution; add HDI, HPED, TEA in sequence to the dichloromethane solution of PCL-diol, protect with nitrogen, and stir at room temperature for 8-10min , and then the temperature was raised to 40-50° C., kept for half an hour, and the dichloromethane solvent was removed.

[0036] Place the above mixed solution in a vacuum oven and vacuumize for 5-10 minutes to remove excess air bubbles in the mixed solution; then pour the mixed solution into a polytetrafluoroethylene mold, place it in an oven, protect it with nitrogen, and slowly heat up. Keep at 30°C for 1h, 50°C for 1h, 70°C for 1h, 90°C for 1h, and finally 110°C for 1h. Then the above product is cooled, demoulded, and set aside.

[0037] The mol ratio of HDI, PCL-diol, HPED, TEA is in this embodiment:

[0038] 2·n DIM : 2·n PCL-diol : 4 n HPED : 3 n TEA =2:1.5:0.4:1

Embodiment 3

[0040]Stir and dissolve PCL-diol with a number-average molecular weight of 20,000 in dichloromethane to obtain a uniform solution; add HDI, HPED, and TEA in sequence to the dichloromethane solution of PCL-diol, under nitrogen protection, and stir for 8-10 minutes at room temperature , and then the temperature was raised to 40-50° C., kept for half an hour, and the dichloromethane solvent was removed.

[0041] Place the above mixed solution in a vacuum oven and vacuumize for 5-10 minutes to remove excess air bubbles in the mixed solution; then pour the mixed solution into a polytetrafluoroethylene mold, place it in an oven, protect it with nitrogen, and slowly heat up. Keep at 30°C for 1h, 50°C for 1h, 70°C for 1h, 90°C for 1h, and finally 110°C for 1h. Then the above product is cooled, demoulded, and set aside.

[0042] The mol ratio of HDI, PCL-diol, HPED, TEA is in this embodiment:

[0043] 2·n DIM : 2·n PCL-diol : 4 n HPED : 3 n TEA =5:4:0.8:0.2

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Abstract

The invention relates to a rapid self-repairing shape memory polymer and a preparation method thereof. The rapid self-repairing shape memory polymer is segmented polyurethane; a molecular chain contains a polycaprolactone block, a carbamate chain segment and a dendritic node. The preparation method of the rapid self-repairing shape memory polymer comprises the following steps: carrying out condensation polymerization on a diisocyanate monomer, and polycaprolactone diol (PCL-diol), N,N,N',N'-tetra(2-hydropropyl)ethylene diamine (HPED) and triethanolamine (TEA) respectively to form the segmented polyurethane containing the polycaprolactone block, the carbamate chain segment and the dendritic node on a main chain. Compared with the prior art, the segmented polyurethane can trigger a shape memory effect at relatively low temperature (50 DEG C to 90 DEG C) and shape memory recovery time is very short (30s to 76s). Micro-cracks generated in an initial shape fixing process can be self-repaired in a shape memory recovery process, so that the shape memory effect of the segmented polyurethane has a high circulating property.

Description

technical field [0001] The invention relates to a shape-memory polymer, in particular to a shape-memory polymer with multi-cycle rapid self-repair function and a preparation method thereof. Background technique [0002] A solid material with a certain shape, after a certain plastic deformation under a certain external stimulus, and after a specific environmental stimulus, the phenomenon that the material completely returns to the shape before deformation is called the shape memory effect. According to the different environmental conditions to realize the memory function, it can be divided into temperature-sensitive, light-sensitive and acid-base sensitive. At present, the most studied and applied materials are thermally induced shape memory polymer materials. [0003] Normally, thermotropic shape memory polymers are plastic and highly brittle. Therefore, during the large-scale shape fixation process, a large number of microcracks will be generated at the corners of the fold...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/42C08G18/32
CPCC08G18/3281C08G18/3284C08G18/4277C08G18/6655C08G2280/00
Inventor 陈玉洁哈菲兹·乌尔·拉赫曼刘河洲李华
Owner SHANGHAI JIAO TONG UNIV
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