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Modified hydrophilic polyrotaxane and cross-linked polyrotaxane

A hydrophilic polyrotaxane technology, applied in the field of hydrophilic modified polyrotaxane, can solve the problems of low mechanical strength and uneven structure

Inactive Publication Date: 2008-08-27
NISSAN MOTOR CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in chemical gels, the cross-linking points are fixed, thereby permanently maintaining the heterogeneous structure formed by the cross-linking reaction, so that it has the disadvantage of significantly lower mechanical strength

Method used

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  • Modified hydrophilic polyrotaxane and cross-linked polyrotaxane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0132] (1) Preparation of PEG-carboxylic acid by TEMPO oxidation of PEG

[0133] 10 g of polyethylene glycol (PEG) (molecular weight: 5000), 100 mg of TEMPO (2,2,6,6-tetramethyl-1-piperidinyl-oxyl radical) and 1 g of sodium bromide were dissolved in 100 ml of water. A commercially available sodium hypochlorite aqueous solution (available chlorine concentration: 5%) was added in an amount of 5 ml, and stirred at room temperature for 10 minutes. To decompose excess sodium hypochlorite, ethanol in the range of up to 5 ml was added to terminate the reaction.

[0134] Extraction with 50 ml of dichloromethane was repeated three times, thereby extracting components other than inorganic salts. Thereafter dichloromethane was distilled off from the extracted fraction using an evaporator. Then, the fractions were dissolved in hot ethanol and then allowed to stand overnight in a freezer (-4°C) to extract only PEG-carboxylic acid, which was then recovered and dried.

[0135] (2) Prepara...

Embodiment 2

[0146] (1) Preparation of PEG-carboxylic acid by TEMPO oxidation of PEG

[0147] 10 g of polyethylene glycol (PEG) (molecular weight: 5000), 100 mg of TEMPO (2,2,6,6-tetramethyl-1-piperidinyl-oxyl radical) and 1 g of sodium bromide were dissolved in 100 ml of water. A commercially available sodium hypochlorite aqueous solution (available chlorine concentration: 5%) was added in an amount of 5 ml, and stirred at room temperature for 10 minutes. To decompose excess sodium hypochlorite, ethanol in the range of up to 5 ml was added to terminate the reaction.

[0148] Extraction with 50 ml of dichloromethane was repeated three times, thereby extracting components other than inorganic salts. Thereafter dichloromethane was distilled off from the extracted fraction using an evaporator. Then, the fractions were dissolved in hot ethanol and then allowed to stand overnight in a freezer (-4°C) to extract only PEG-carboxylic acid, which was then recovered and dried.

[0149] (2) Prepara...

Embodiment 3

[0160] (1) Preparation of PEG-carboxylic acid by TEMPO oxidation of PEG

[0161] 10 g of polyethylene glycol (PEG) (molecular weight: 100,000), 100 mg of TEMPO (2,2,6,6-tetramethyl-1-piperidinyl-oxyl radical) and 1 g of sodium bromide were dissolved in 100 ml of water. A commercially available sodium hypochlorite aqueous solution (available chlorine concentration: 5%) was added in an amount of 5 ml, and stirred at room temperature for 10 minutes. To decompose excess sodium hypochlorite, ethanol in the range of up to 5 ml was added to terminate the reaction.

[0162] Extraction with 50 ml of dichloromethane was repeated three times, thereby extracting components other than inorganic salts. Thereafter dichloromethane was distilled off from the extracted fraction using an evaporator. Then, the fractions were dissolved in hot ethanol and then allowed to stand overnight in a freezer (-4°C) to extract only PEG-carboxylic acid, which was then recovered and dried.

[0163] (2) Prep...

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Abstract

To provide a modified hydrophilic polyrotaxane which is soluble in water or an aqueous solvent, a cross-linked polyrotaxane produced using the modified hydrophilic polyrotaxane, and a solvent for dissolving the modified hydrophilic polyrotaxane therein. A modified hydrophilic polyrotaxane having a cyclic molecule, a linear molecule which includes the cyclic molecule with piercing through the cyclic molecule, and capping groups which are placed at both end termini of the linear molecule and serve to prevent the cyclic molecule from leaving from the linear molecule. The cyclic molecule is cyclodextrin, and each of all or some of the hydroxyl groups in the cyclodextrin is modified with a hydrophilic modification group. A cross-linked polyrotaxane comprising the modified hydrophilic polyrotaxane and a polymer linked through a cyclic molecule. A solvate for dissolving the modified hydrophilic polyrotaxane therein comprising water, an aqueous solvent or a combination thereof.

Description

technical field [0001] The invention relates to a hydrophilic modified polyrotaxane and a crosslinked polyrotaxane. More specifically, it relates to a hydrophilic modified polyrotaxane in which the cyclic molecule is a cyclodextrin and at least a part of hydroxyl groups of the cyclodextrin are modified using a hydrophilic modifying group; using the hydrophilic modified polyrotaxane A crosslinked polyrotaxane of alkane and a solvent for dissolving the hydrophilic modified polyrotaxane. Background technique [0002] So far, gel materials have been widely used in products such as food, medical supplies, daily necessities, and industrial supplies. Although various types of polymer compounds have been applied to these articles, there are only two types of physical gels and chemical gels from a structural point of view. [0003] Physical gels are gels commonly found in nature, such as gelatin or agar. In addition, most of biological tissues are occupied by various physical gels...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/32C08B37/16
CPCC08B37/0015C08G83/007C08B37/0012C08G65/00C08G65/32
Inventor 伊藤耕三荒木润铃木达也山中雅彦渡边健太郎
Owner NISSAN MOTOR CO LTD
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