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Method for preparing chitosan/crylic acid composite through initiating polymerization by using glow discharge electrolysis plasma

An electrolytic plasma and glow discharge technology, applied in the field of composite materials, can solve problems such as limited application and loss

Inactive Publication Date: 2013-03-20
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the free amino groups in chitosan molecules can accept protons to form salts, which can be dissolved in acidic solutions and cause loss, which severely limits its application.

Method used

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  • Method for preparing chitosan/crylic acid composite through initiating polymerization by using glow discharge electrolysis plasma
  • Method for preparing chitosan/crylic acid composite through initiating polymerization by using glow discharge electrolysis plasma
  • Method for preparing chitosan/crylic acid composite through initiating polymerization by using glow discharge electrolysis plasma

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Add 0.2 g CS, 0.07 g MBA and 35 mL of 2% acetic acid solution by mass percentage into a 250 mL three-necked flask, stir at 70°C to dissolve the mixture thoroughly, add 12 mL of AA, continue stirring for 10 min, turn on the power, and Perform glow discharge at 600 V, 43 mA for 5 min, and the current drops to 14 Am; stop the discharge, continue to stir in an oil bath at 75 °C for 3–4 h, then cool to room temperature to obtain a jelly-like gel; take out the product, cut it into pieces to about 2-5 mm, neutralize with NaOH to make the neutralization degree reach 90%; wash repeatedly with water and ethanol to remove unreacted raw materials, and finally dry in vacuum at 50°C to obtain CS / PAA hydrogel, crush and pass through 100 mesh Sieve, promptly obtain CS / AA composite material, yield 53%.

[0074] The performance indicators are as follows:

[0075] The amount of distilled water absorbed in 10 minutes is about 233 g / g, the maximum amount of distilled water absorbed is 250 ...

Embodiment 2

[0077] Add 0.3 g CS, 0.07 g MBA and 40 mL of 1% acetic acid by mass in a 250 mL three-necked flask, stir at about 75°C to dissolve the mixture completely, then add 9 mL of AA and continue stirring for 15 min, turn on the power supply, at a voltage of 600 V, Discharge at a current of 49 mA for 3 minutes and then the current drops to 11 mA, stop the discharge, continue to stir at 75 °C for 3~4 h (post-polymerization), cool to room temperature, and obtain a jelly-like gel; take out the product and cut it into a diameter of about 2~ 5 mm fragments, and then neutralized with 0.1 mol / L NaOH to make the neutralization degree reach 90%; the product was washed repeatedly with water and ethanol to remove unreacted raw materials, and vacuum-dried at 50°C to constant weight to obtain CS / PAA water After the gel was crushed through a 100-mesh sieve, a milky white composite material was obtained with a yield of 49%.

[0078] The performance indicators are as follows:

[0079] The amount of ...

Embodiment 3

[0081] Add 0.4 g CS, 0.14 g MBA and 35 mL of 5% acetic acid solution by mass to a 250 mL three-neck flask, stir at 80°C to dissolve the mixture thoroughly, add 10 mL of AA and continue stirring for 10 min, insert the two electrodes and turn on the power , glow discharge at 600 V, 49 mA for 4.5 min and the current dropped to 4 Am; stop the discharge, continue to stir in an oil bath at 75 ℃ for 3~4 h, cool to room temperature, take out the product, and cut it into pieces to about 2~5 mm, neutralized with NaOH to achieve a neutralization degree of 90%. Repeated washing with water and ethanol to remove unreacted raw materials, and finally vacuum drying at 50 °C to obtain CS / PAA hydrogel; pulverize and pass through a 100-mesh sieve to obtain CS / AA composite material with a yield of 51%.

[0082] The performance indicators are as follows:

[0083] The amount of distilled water absorbed in 10 minutes is about 245 g / g, and the amount of distilled water absorbed in 50 minutes is basic...

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Abstract

The invention provides a method for preparing a chitosan / crylic acid composite which is prepared by using chitosan and crylic acid as raw materials and N,N'-methylene bisacrylamide as a crosslinking agent through initiating polymerization by using glow discharge electrolysis plasma in an acetic acid water solution in a one-step manner. The chitosan / crylic acid composite has the advantages of high water absorption rate, high salt tolerance, good recycling property and large dye absorption quantity so as to be a composite water absorbing material with excellent property, and can be used in fields such as agriculture and forestry, gardening, purification of sewage and medicine slow release. In addition, the preparation method has the advantages of easily available raw materials, simple preparation process and low synthesis cost; and an initiating agent is not needed, thus the preparation method avoids the secondary pollution caused by the initiating agent, is a green synthesis technology according with the sustainable development, and has a potential application prospect.

Description

technical field [0001] The invention belongs to the field of composite materials, and relates to a method for preparing a chitosan / acrylic acid hydrogel composite material, in particular to a method for synthesizing chitosan / acrylic acid hydrogel by using glow discharge electrolysis plasma. Background technique [0002] Chitosan (Chitosan, CS) is a natural cationic polymer obtained by deacetylation of chitin. It is composed of glucosamine units and N-acetylglucosamine units. It is the only alkaline polysaccharide that exists in large quantities in nature. It is not only rich in sources, but also has good tissue compatibility, biodegradability and adhesion. However, the free amino groups in chitosan molecules can accept protons to form salts, which can be dissolved in acidic solutions and cause loss, which severely limits its application. Therefore, improving acid resistance is one of the hotspots in chitosan modification research. [0003] The abundant hydroxyl and amino g...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F2/52
Inventor 俞洁潘元沛陆泉芳杨格格杨武陆宗芳
Owner NORTHWEST NORMAL UNIVERSITY
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