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Polyvinyl alcohol membrane with self-repair function implemented by aid of dynamic covalent bonds and method for preparing polyvinyl alcohol membrane

A polyvinyl alcohol film and polyvinyl alcohol technology, applied in the field of functional materials, can solve the problems of easy mechanical failure, damage, poor water resistance, etc., and achieve the effects of reducing maintenance, prolonging service life, and good water resistance.

Inactive Publication Date: 2017-05-10
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a self-repairing modified polyvinyl alcohol film and its Preparation

Method used

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  • Polyvinyl alcohol membrane with self-repair function implemented by aid of dynamic covalent bonds and method for preparing polyvinyl alcohol membrane
  • Polyvinyl alcohol membrane with self-repair function implemented by aid of dynamic covalent bonds and method for preparing polyvinyl alcohol membrane
  • Polyvinyl alcohol membrane with self-repair function implemented by aid of dynamic covalent bonds and method for preparing polyvinyl alcohol membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Preparation of self-healing polyvinyl alcohol membranes by using Diels-Alder reaction to construct dynamic covalent bonds:

[0041] (1) Mix 11g of polyvinyl alcohol with 200mL of DMSO, stir at 70°C~80°C until the solution becomes transparent; then add 2g of p-toluenesulfonic acid and stir to dissolve evenly, then add 20mL of furfural, stir at 70°C~80°C for 12 hours, Precipitate the product with ethanol and extract it for 5 hours, then dry it to obtain the product, that is, obtain furan ring graft-modified polyvinyl alcohol;

[0042] (2) Take 0.7g of the graft-modified polyvinyl alcohol obtained in (1), dissolve it in 30mL of DMSO at 70~80°C, cool to room temperature, add 0.2g of N,N'-hexamethylenebisma imide, stirred until uniform, to obtain a modified PVA film liquid with self-healing properties. Scrape-coat the obtained film solution on a polytetrafluoroethylene film frame with a size of 10cm*10cm, place it in an oven at 60°C for 12 hours, and after the solvent is dr...

Embodiment 2

[0046] Preparation of polyvinyl alcohol film with high grafting degree and dynamic covalent bond self-healing:

[0047] (1) Mix 11g of polyvinyl alcohol with 200ml of DMSO, stir at 70°C~80°C until the solution becomes transparent; then add 2g of p-toluenesulfonic acid and stir to dissolve evenly, then add 20ml of furfural, stir at 70°C~80°C for 12 hours, The product was precipitated with ethanol and extracted for 5 hours, then dried to obtain the product of the first step. Take 2g of the product of the first step and dissolve it in 100ml of DMSO at 70~80°C, add 3ml of furoyl chloride dropwise in an ice-water bath for 30 minutes, react at room temperature for 4 hours, precipitate with deionized water, wash and dry to obtain the product of the second step, that is, the novel Graft-modified polyvinyl alcohol;

[0048] (2) Take 0.7g of the graft-modified polyvinyl alcohol obtained in (1), dissolve it in 30ml of DMSO at 70~80°C, cool to room temperature, add 0.2g of N,N'-hexamethy...

Embodiment 3

[0053] Preparation of dynamic covalent bond self-healing polyvinyl alcohol film:

[0054] (1) Mix 11g of polyvinyl alcohol with 200mL of DMSO, stir at 70°C~80°C until the solution becomes transparent; then add 2g of p-toluenesulfonic acid and stir to dissolve evenly, then add 20mL of furfural, stir at 70°C~80°C for 12 hours, The product was precipitated with ethanol and extracted for 5 hours, then dried to obtain the product of the first step;

[0055] (2) Take 2g of the product from the first step and dissolve it in 100mL DMSO at 70-80°C, add 0.5g of divinylbenzene, stir until uniform, and obtain a modified PVA membrane liquid with self-healing properties. The obtained film solution was scraped onto a polytetrafluoroethylene film frame with a size of 10cm*10cm, and placed in an oven at 60°C for 12 hours. After the solvent was dried, a modified polyvinyl alcohol pervaporation film with self-healing ability was obtained.

[0056] The restoration effect test is similar to Examp...

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Abstract

The invention belongs to the technical field of functional materials, and particularly discloses a polyvinyl alcohol membrane with a self-repair function implemented by the aid of dynamic covalent bonds and a method for preparing the polyvinyl alcohol membrane. The dynamic covalent bonds are formed by the aid of Diels-Alder reaction, so that the polyvinyl alcohol membrane can have the self-repair ability. The method includes carrying out graft reaction on polyvinyl alcohol and furan derivatives to obtain furan ring grafted and modified polyvinyl alcohol; adding certain cross-linking agents into the furan ring grafted and modified polyvinyl alcohol and carrying out Diels-Alder reaction to obtain the polyvinyl alcohol membrane with the self-repair function. Diels-Alder reaction can be carried out on the certain cross-linking agents and furan groups. The polyvinyl alcohol membrane and the method have the advantages that the polyvinyl alcohol membrane is excellent in separation performance and hydrophilic performance just like common polyvinyl alcohol membranes, and cross-linked structures of the polyvinyl alcohol membrane are excellent in temperature responsiveness and thermal reversibility; the polyvinyl alcohol membrane is excellent in self-repair ability for drawing and scratching marks under simple conditions, and the gas tightness and the water resistance of the polyvinyl alcohol membrane in wet-state environments can be obviously improved; the polyvinyl alcohol membrane prepared by the aid of the method can be used in broad fields such as the fields of permeation and evaporation membrane separation and the fields of proton exchange membrane fuel cells, catalyst carrying and ion exchange membranes.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a polyvinyl alcohol film which utilizes dynamic covalent bonds to realize a self-repairing function and a preparation method thereof. Background technique [0002] Polyvinyl alcohol (PVA) is a hydrophilic polymer. This polymer has good density, high crystallinity and strong adhesion. The film made is flexible and smooth, oil-resistant, solvent-resistant, abrasion-resistant, Good gas permeability and wide application. Polyvinyl alcohol has the characteristics of non-toxic, odorless and harmless to the human body, good affinity with the natural environment, no accumulation, and no pollution. The biggest advantage of polyvinyl alcohol film is hydrophilicity, and the biggest disadvantage is poor water resistance. [0003] Since PVA contains a large number of hydrophilic groups, the application of PVA film can separate most of the near-boiling point mixture ...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08J5/18C08J3/24C08F16/06C08F8/28
CPCC08J5/18C08F8/28C08J3/24C08J2329/04C08K5/12C08L2203/16C08F16/06C08L29/04
Inventor 浦鸿汀高海程夏牧寒
Owner TONGJI UNIV
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