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Preparation method of reinforced polyvinyl alcohol compound

A technology for polyvinyl alcohol and compound, which is applied in the field of preparation of reinforced polyvinyl alcohol compound, and can solve the problems of complex treatment method and severe conditions.

Inactive Publication Date: 2012-09-12
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method treats Kevlar fibers and carbon nanotubes with concentrated acid at high temperature, and the processing method is complicated and the conditions are severe.

Method used

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  • Preparation method of reinforced polyvinyl alcohol compound
  • Preparation method of reinforced polyvinyl alcohol compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In a 25 ml white sample bottle, add 100ml dimethyl sulfoxide, 0.2g Kevlar fiber, 0.3g potassium hydroxide, 50 o C under stirring to dissolve. Add 0.25 ml ultrasonically dispersed Kevlar / MWNT aqueous dispersion (4 mg / ml), 1 g polyvinyl alcohol, add 14.75 ml deionized water, heat and stir at 40°C for 4 h to obtain a uniformly dispersed solution. Cast to form a film, and vacuum dry at 65°C for 24 hours, then raise the temperature to 90°C and dry for 24 hours.

[0026] figure 1 Infrared spectra of multi-walled carbon nanotubes (MWNT), Kevlar nanofibers (Kevlar) and Kevlar nanofibers non-covalently modified multi-walled carbon nanotubes (Kevlar / MWNT). In the infrared spectrum of Kevlar / MWNT, 1644 cm -1 A peak representing the C=O bond appeared at 1545 cm －1 A peak representing the C-N bond appeared at , which proved that the Kevlar nanofibers were adsorbed on the surface of the multi-walled carbon nanotubes, and the non-covalent modification was successful.

Embodiment 2

[0028] In a 25 ml white sample bottle, add 100ml dimethyl sulfoxide, 0.2g Kevlar fiber, 0.3g potassium hydroxide, 50 o C under stirring to dissolve. Add 0.625 ml ultrasonically dispersed Kevlar / MWNT aqueous dispersion (4 mg / ml), 1 g polyvinyl alcohol, add 14.375 ml deionized water, heat and stir at 40°C for 4 h to obtain a uniformly dispersed solution. Cast to form a film, and dry at 65°C for 24 hours, then raise the temperature to 90°C and dry for 24 hours.

Embodiment 3

[0031] In a 25 ml white sample bottle, add 100ml dimethyl sulfoxide, 0.2g Kevlar fiber, 0.3g potassium hydroxide, 50 o C under stirring to dissolve. Add 1.25 ml ultrasonically dispersed Kevlar / MWNT aqueous dispersion (4 mg / ml), 1 g polyvinyl alcohol, add 13.75 ml deionized water, heat and stir at 40°C for 4 h to obtain a uniformly dispersed solution. Cast into film. And dry at 65°C for 24 hours, then raise the temperature to 90°C and dry for 24 hours.

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Abstract

The invention relates to a preparation method of a reinforced polyvinyl alcohol compound. The preparation method comprises the following steps: 1, dissolving Kevlar fibers in potassium hydroxide-containing dimethyl sulfoxide through a magnetic stirring method to obtain a stably-dispersed Kevlar nanofiber solution; 2, adding multi-walled carbon nanotubes to the Kevlar nanofiber solution, preparinga Kevlar non-covalently modified multi-walled carbon nanotube (Kevlar / MWNT) dispersion through an ultrasonic method, drying the solvent to obtain Kevlar / MWNT powder, and adding the Kevlar / MWNT powderto deionized water to prepare a Kevlar / MWNT water dispersion; and 3, adding polyvinyl alcohol, and carrying out heating stirring and vacuum drying sequentially to prepare polyvinyl alcohol compound reinforced by the the Kevlar nanofiber non-covalently modified multi-walled carbon nanotubes. According to the reinforced polyvinyl alcohol compound containing 2.0% of the Kevlar nanofiber non-covalently modified multi-walled carbon nanotubes synthesized in the invention, the fracture strength is 62.4% higher than that of a polyvinyl alcohol polymer, the Young modulus is improved by 61.3%, and excellent mechanical performances are performed.

Description

technical field [0001] The invention relates to a method for preparing a reinforced polyvinyl alcohol compound, specifically, a method for preparing a reinforced polyvinyl alcohol compound by non-covalently modifying multi-walled carbon nanotubes using Kevlar nanofibers. Background technique [0002] The ideal carbon nanotube is a seamless, hollow tube formed by graphene sheets formed by carbon atoms, without any defects. In recent years, carbon nanotubes have attracted extensive attention due to their unique structural features and excellent physical and chemical properties. Among them, introducing carbon nanotubes into a polymer matrix to prepare nanocomposite materials can significantly improve the comprehensive performance of materials. At present, there are mainly the following treatment methods for carbon nanotubes used in composite materials: direct solvent dispersion, covalent modification and non-covalent modification. Solvent direct dispersion means that carbon n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08L77/10C08K9/04C08K7/00
Inventor 王佳良于珊史子兴印杰
Owner SHANGHAI JIAO TONG UNIV
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