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A pva/ptmg-paa blend film with shape memory and repairable functions

A technology of memory and function, applied in the field of polymer functionalization, can solve the problem of slow repair of ordinary PVA hydrogel

Active Publication Date: 2022-07-01
CHANGCHUN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But ordinary PVA hydrogel repairs slowly

Method used

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  • A pva/ptmg-paa blend film with shape memory and repairable functions
  • A pva/ptmg-paa blend film with shape memory and repairable functions
  • A pva/ptmg-paa blend film with shape memory and repairable functions

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Embodiment 1

[0018] Weigh an appropriate amount of PTMG and AGE into a 250ml three-necked flask and let it pass nitrogen to prevent high temperature oxidation of epoxy. After 40min, heat to melt PTMG and stir; slowly add the catalyst concentrated sulfuric acid to a certain amount of tetrahydrofuran, mix well, and then drop Added to the reaction system, condensed and refluxed, heated to 125° C., stopped flowing nitrogen, and changed to vacuum to carry out the reaction. After 4h, add 50ml of deionized water to the system to stop the reaction, and reflux for 1h, then use Ca(OH) 2 The catalyst was neutralized and washed with water for separation, and the low boilers were distilled off under reduced pressure. An appropriate amount of the above product and methanol were added to a 250ml three-necked flask equipped with a magnetic stirring bar and passed through nitrogen for 30min, an appropriate amount of azobisisobutyronitrile catalyst was added, and AA was added dropwise with stirring at 65°C....

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Abstract

The invention relates to a PVA / PTMG-PAA blended film with shape memory and repairable functions. g =-76°C) is a polymer with soft segment and PAA as hydrophilic segment, dehydration with PTMG through epoxy ring opening at one end of AGE, so that both ends of PTMG are functionalized by double bonds, and then the synthesized PTMG-AGE initiates AA radical Polymerization, and the final product is blended with PVA to obtain a PVA / PTMG‑PAA blended film. Because the synthesized polymer has a soft segment, and the hydrophilic segment PAA contains a large number of carboxyl groups, which can form stable hydrogen bonds with the hydroxyl groups of PVA, and the intermolecular hydrogen bonds of PVA itself are weak. Greatly increases the water absorption and swelling rate of PVA, and achieves excellent results in shape recovery and repair.

Description

technical field [0001] The invention belongs to the field of polymer functionalization, and relates to a PVA / PTMG-PAA blended film with shape memory and repairable functions. Background technique [0002] The phenomenon that a solid material of a certain shape undergoes plastic deformation under a certain external stimulus, and after a specific environmental stimulus, the material completely returns to the shape before deformation is called the shape memory effect. According to the different environmental conditions for realizing the memory function, it can be divided into temperature-sensitive, water-sensitive, photosensitive and acid-base sensitive memory materials. At present, the most applied researches are thermal-induced shape memory and water-induced shape memory polymers. Material. [0003] Integrating repairable functions into man-made materials can not only reduce raw material consumption, but also improve their durability and reliability. Currently, reversible c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08L51/08C08F283/06C08F220/06C08J5/18
CPCC08L29/04C08F283/06C08J5/18C08J2329/04C08J2451/08C08L51/08C08F220/06
Inventor 宋晓峰任亚君周琦锋夏文龙张转转
Owner CHANGCHUN UNIV OF TECH
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