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Preparation method for supramolecular assembly body based on polyvinyl alcohol and cyclopolysaccharide

A supramolecular assembly, polyvinyl alcohol technology, applied in the field of polymer material functionalization, can solve the problems of unsuitable melt processing, the melting point and thermal decomposition temperature of polyvinyl alcohol are close, and achieve good solubility, easy separation and purification, Simple to use effects

Inactive Publication Date: 2018-10-02
TIANJIN UNIV OF SCI & TECH
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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 solve the problem that the melting point of polyvinyl alcohol is close to the thermal decomposition temperature, and it is not suitable to obtain products through melting processing. It provides a polyvinyl alcohol as the guest molecule and cyclopolysaccharide as the main molecule. The mechanism of driving molecular motion and the method of preparing supramolecular assemblies

Method used

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  • Preparation method for supramolecular assembly body based on polyvinyl alcohol and cyclopolysaccharide
  • Preparation method for supramolecular assembly body based on polyvinyl alcohol and cyclopolysaccharide

Examples

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Effect test

Embodiment 1

[0018] With cyclopolysaccharide γ-cyclodextrin as the main molecule, the molecular weight Mw=0.9×10 4 g / mol, polyvinyl alcohol with a degree of alcoholysis of 80% is the guest molecule, and the polyvinyl alcohol supramolecular assembly is prepared, and the specific steps are as follows:

[0019] ① Add 0.25g of the above PVA solid to 50mL of distilled water to prepare a PVA dilute solution.

[0020] ②Dissolve 0.5g of γ-cyclodextrin solid powder into the above dilute polyvinyl alcohol solution, gradually raise the temperature to 70°C within 5 minutes, condense and reflux, stir for 4 hours, cool down to 25°C, and continue stirring for 10 hours. The above reaction process was repeated 3 times.

[0021] ③ After the reaction is finished, add 20 mL of the concentrated solution obtained by rotary evaporation of the above solution dropwise into 120 mL of cold ethanol, and stir to obtain a precipitate. The resulting precipitate was centrifuged at a speed of 10000 r / min. The precipita...

Embodiment 2

[0024] With cyclopolysaccharide β-cyclodextrin as the main molecule, the molecular weight Mw=0.9×10 4 g / mol, polyvinyl alcohol with a degree of alcoholysis of 80% is the guest molecule, and the polyvinyl alcohol supramolecular assembly is prepared, and the specific steps are as follows:

[0025] ① Add 0.25g of the above PVA solid to 50mL of distilled water to prepare a PVA dilute solution.

[0026] ②Dissolve 2.5g of β-cyclodextrin solid powder into the above dilute PVA solution, gradually raise the temperature to 80°C within 5 minutes, condense and reflux, stir for 4 hours, cool down to 20°C, and continue stirring for 12 hours. The above reaction process was repeated 4 times.

[0027] ③ After the reaction is finished, add 20 mL of the concentrated solution obtained by rotary evaporation of the above solution dropwise into 120 mL of cold ethanol, and stir to obtain a precipitate. The resulting precipitate was centrifuged at a speed of 10000 r / min. The precipitated product obta...

Embodiment 3

[0029] With cyclopolysaccharide α-cyclodextrin as the main molecule, the molecular weight Mw=0.2×10 4 g / mol, polyvinyl alcohol with a degree of alcoholysis of 80% is the guest molecule, and the polyvinyl alcohol supramolecular assembly is prepared, and the specific steps are as follows:

[0030] ① Add 0.25g of the above PVA solid to 50mL of distilled water to prepare a PVA dilute solution.

[0031] ②Dissolve 1.0g of α-cyclodextrin solid powder into the above dilute PVA solution, gradually raise the temperature to 90°C within 5 minutes, condense and reflux, stir for 8 hours, cool down to 4°C, and continue stirring for 24 hours. The above reaction process was repeated 8 times.

[0032] ③ After the reaction was completed, 20 mL of the concentrated solution obtained by rotary evaporation of the above solution was added dropwise to 150 mL of methanol, and stirred to obtain a precipitate. The resulting precipitate was centrifuged at a speed of 10000 r / min. The precipitated produc...

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Abstract

The invention discloses a preparation method for a supramolecular assembly body based on polyvinyl alcohol and cyclopolysaccharides, that is, polyvinyl alcohol is adopted as an object molecule, and cyclopolysaccharides are adopted as a main body molecule, and by using a phase diffusion method, the supramolecular assembly body is prepared by using a mechanism of high-low temperature driving molecule movement. The preparation method comprises the following reaction steps: putting cyclopolysaccharide solid powder into a polyvinyl alcohol solution, gradually heating to 70-95 DEG C, and stirring toreact for 4-8 hours; cooling to 4-25 DEG C, and stirring to react for 10-24 hours; repeating the high-low temperature process for 3-8 times; rotating, evaporating and concentrating the reaction solution, precipitating and separating the concentrated liquid; washing the product by using a composition washing solvent at a low temperature, and drying for 24 hours; repeatedly washing and drying for 2-3 times, thereby obtaining the cyclopolysaccharide supramolecular assembly body. The product prepared by using the method is green and environmentally friendly and simple in preparation process, thewater solubility of the polyvinyl alcohol is greatly improved, and the thermal stability of the polyvinyl alcohol is remarkably improved.

Description

technical field [0001] The invention relates to a method for preparing a supramolecular assembly with polyvinyl alcohol and cyclopolysaccharide, and belongs to the technical field of polymer material functionalization. Background technique [0002] In recent years, the theory of supramolecular chemistry has shown unparalleled advantages in the construction of polymers with the characteristics of wide range of construction units and convenient and fast construction methods. Researchers can use the construction advantages of supramolecular assemblies to realize the functions of materials at the molecular level. modified. Polyvinyl alcohol (PVA) is a general-purpose polymer material with excellent performance and wide application. According to the degree of polymerization, PVA can be divided into high (polymerization degree is 2400-2500), medium (polymerization degree is 1700-1800), low (polymerization degree According to the degree of alcoholysis, PVA can be divided into supe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/16C08L29/04
CPCC08L5/16C08L29/04
Inventor 郭敏杰张含陈思琪贾挺挺刘丽君樊志李盛华赵金
Owner TIANJIN UNIV OF SCI & TECH
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