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Preparation method of nylon CS blended membrane with high tensile strength

A high tensile strength, blended film technology, applied in the field of preparation of high tensile strength nylon CS blend film, can solve the problems of CS molecular chain scission, loss of natural polymer properties, complex process, etc. Capacitive, enhanced microphase mixing effect, low cost effect

Active Publication Date: 2016-09-07
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method is complicated, and the grafting modification process is likely to cause the chain scission behavior of CS molecular chains, which greatly loses the original characteristics of natural polymers.

Method used

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  • Preparation method of nylon CS blended membrane with high tensile strength
  • Preparation method of nylon CS blended membrane with high tensile strength

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 0.5 g of nylon 6 with a molecular weight of 10000 g / mol was dissolved in 10 ml of formic acid to obtain a film-forming mother liquor. Add chitosan with a molecular weight of 10000g / mol to the mother liquor, the degree of deacetylation is 95%, and the weight ratio of chitosan to nylon is 50%. After stirring for 24h, stand still for 8h; put the mother liquor on a conductive film-forming plate; The plate is placed in a parallel plate electric field, and an electric field is applied on both sides of the watch glass. The upper plate of the conductive film-forming plate is negatively charged, and the lower plate of the conductive film-forming plate is grounded. The AC electric field strength is 22kV / m (220V voltage, plate spacing 1cm) , Frequency 50Hz. After the solvent evaporates, a nylon / chitosan blend film is obtained. The obtained blend film has a tensile strength of 100 MPa and a breaking elongation of 75%.

Embodiment 2

[0026] 0.5 g of nylon 66 with a molecular weight of 100000 g / mol was dissolved in 500 ml of formic acid to obtain a film-forming mother liquor. Add chitosan with a molecular weight of 200,000 g / mol, a degree of deacetylation of 70%, and a weight ratio of chitosan to nylon of 10% to the mother liquor. After stirring for 72h, stand still for 4h; place the mother liquor on a conductive film-forming plate; The plate is placed in a parallel plate electric field, and an electric field is applied on both sides of the watch glass. The upper plate of the conductive film-forming plate is negatively charged and the lower plate of the conductive film-forming plate is grounded. The AC voltage field strength is 30kV / m and the electric field frequency is 0.01Hz. After the solvent evaporates, a nylon / chitosan mixed film is obtained. The resulting composite film has a tensile strength of 215 MPa and a breaking elongation of 175%.

Embodiment 3

[0028] 0.5 g of nylon 1010 with a molecular weight of 1000 g / mol was dissolved in 0.5 ml of formic acid to obtain a film-forming mother liquor. Add chitosan with a molecular weight of 2000g / mol, a degree of deacetylation of 80%, and a weight ratio of chitosan to nylon of 90% to the mother liquor. After stirring for 72h, stand still for 6h; place the mother liquor on a conductive film-forming plate; The plate is placed in a parallel plate electric field, and an electric field is applied on both sides of the watch glass. The upper plate of the conductive film-forming plate is negatively charged and the lower plate of the conductive film-forming plate is grounded. The AC voltage field is 0.01kV / m and the frequency is 200Hz. After the solvent evaporates, a nylon / chitosan mixed film is obtained. The resulting composite film has a tensile strength of 95 MPa and a breaking elongation of 75%.

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Abstract

The invention relates to a preparation method of a nylon CS blended membrane with high tensile strength. In the application of the method, subsequent treatment is not required for the surface of nylone and chitosan, and a solubilizer is not added into a blend; an alternating electric field is exerted during the process of the inversion from phase to membrane; when the alternating electric field is exerted on the chitosan-formic acid-nylon system, phase separation between CS and PA begins as volatilization of solvent continues; different dielectric properties of PA and CS enable the electric field to form electrostatic stress at the phase interface; synergy between the electrostatic stress and interfacial tension can induce micro-phase mixing between macromolecular chains at the interface; through adjusting electric field intensity and alternating current frequency parameter, the characteristic of the response of dipole orientation to the electric field environment is combined to adjust the intensity and direction of the electrostatic stress and the relaxation behavior of chain segments at the interface, thereby intensifying the micro-phase mixing effect at the interface. Therefore, the compatibility and tensile property of the blend are improved. The entire preparation process is low in cost, clean and highly efficient.

Description

Technical field [0001] The invention relates to a preparation method of a high tensile strength nylon CS blend film. Background technique [0002] Chitosan (CS) is a very important natural polymer material. It is widely used in membrane separation, food packaging and drug release due to its cheap and easy availability, excellent biocompatibility and easy degradation. However, the lower mechanical strength of CS limits its application range. Blending nylon with CS can greatly improve the hydrophilicity, antibacterial properties and stability of CS. However, due to the large number of polar functional groups and polycations on the molecular chain of CS, there is often a macro-scale phase separation after blending with nylon (PA), resulting in low mechanical strength of the blend, even less than CS The mechanical strength of itself. [0003] The phase inversion method is one of the main methods for preparing polymer blend films. Taking the chitosan-formic acid-nylon system as an e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08L77/06C08L5/08C08J5/18
CPCC08J5/18C08J2377/02C08J2377/06C08J2405/08C08L77/02C08L77/06C08L2203/16C08L5/08
Inventor 周琦张晶晶
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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