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Polymer composite material as well as preparation method and application thereof

A composite material and polymer technology, applied in the field of polymer composite materials and their preparation, can solve the problems of insignificant improvement effect of polyvinyl alcohol thermal properties, low addition amount, etc. The effect of increasing the decomposition temperature

Active Publication Date: 2022-05-10
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the influence of the dispersion of various materials in polyvinyl alcohol, the addition amount of the existing scheme is low (less than 1 wt%), so the improvement effect on the thermal properties of polyvinyl alcohol is not obvious, and it is urgent to find new materials and scheme to achieve a significant improvement in the thermal performance of polyvinyl alcohol

Method used

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  • Polymer composite material as well as preparation method and application thereof
  • Polymer composite material as well as preparation method and application thereof
  • Polymer composite material as well as preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0027] According to the preparation method of the above-mentioned polymer composite material, according to the mass ratio, the aqueous dispersion of fluorinated graphene nanosheets with a concentration of 0.5 to 1.0 mg / mL and the polyvinyl alcohol with a concentration of 20.0 to 50.0 mg / mL are dispersed in water The liquid is mixed evenly, and then vacuum-dried at a temperature of 60°C to 80°C.

[0028] Preferably, the aqueous dispersion of fluorinated graphene nanosheets is prepared by the following method: dispersing fluorinated graphene in a solvent, and subjecting it to ultrasonic and centrifugation to obtain exfoliated fluorinated graphene nanosheets; Graphene nanosheets dispersed in water.

[0029] Further preferably, the solvent is one or more of isopropanol, N-methylpyrrolidone, and N,N-dimethylformamide dichloromethane.

[0030] Further preferably, the sonication is performed using a water bath sonicator, the power of the water bath sonicator is 30-100 W, and the son...

Embodiment 1

[0037] (1) Disperse the fluorinated graphene powder in N-methylpyrrolidone, reflux at 60°C for 2 h, sonicate for 24 h (50 W) on a water bath ultrasonic instrument, and then centrifuge the dispersion at 3000 rpm for 30 min , to obtain exfoliated fluorinated graphene nanosheets; the above dispersion was filtered, weighed and redispersed in water to form a 1 mg / mL aqueous dispersion of fluorinated graphene.

[0038] (2) Add polyvinyl alcohol particles into water, stir at 80°C until completely dissolved, and prepare a 20.0 mg / mL polyvinyl alcohol aqueous dispersion.

[0039] (3) Add 2.0 mL of fluorinated graphene aqueous dispersion to 9.9 mL of polyvinyl alcohol aqueous dispersion, sonicate for 30 minutes, stir for 30 minutes, pour into a glass surface dish, and dry in a vacuum oven at 60°C to 80°C Dried into a film to obtain a polyvinyl alcohol composite film in a uniform light brown transparent state.

Embodiment 2

[0041](1) Disperse the fluorinated graphene powder in N-methylpyrrolidone, reflux at 60°C for 2 h, sonicate for 24 h (50 W) on a water bath ultrasonic instrument, and then centrifuge the dispersion at 3000 rpm for 30 min , to obtain exfoliated fluorinated graphene nanosheets. The above dispersion was filtered, weighed and re-dispersed in water to form a 1.0 mg / mL aqueous dispersion of graphene fluoride.

[0042] (2) Add polyvinyl alcohol particles into water, stir at 80°C until completely dissolved, and prepare a 30.0 mg / mL polyvinyl alcohol aqueous dispersion.

[0043] (3) Add 6.0 mL of the aqueous dispersion of fluorinated graphene to 6.5 mL of the polyvinyl alcohol aqueous dispersion, sonicate for 30 minutes, stir for 30 minutes, pour into a glass watch glass, and place in a vacuum oven at 60°C to 80°C Dry to form a film to obtain a polyvinyl alcohol composite material film in a uniform light brown transparent state.

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Abstract

The invention discloses a polymer composite material which comprises polyvinyl alcohol and fluorinated graphene nanosheets in a mass ratio of (85-99): (1-15), and the fluorinated graphene nanosheets are connected with polyvinyl alcohol molecules through hydrogen-bond interaction and are uniformly dispersed in the polyvinyl alcohol. The invention also discloses a preparation method and application of the polymer composite material. Compared with the prior art, the polymer composite material provided by the invention takes polyvinyl alcohol as a polymer matrix, modification is realized by a large doping amount of fluorinated graphene nanosheets, stable connection of fluorinated graphene and polyvinyl alcohol is realized through hydrogen-bond interaction between fluorinated graphene and polyvinyl alcohol molecules, and uniform dispersion of fluorinated graphene in polyvinyl alcohol is realized; meanwhile, the polyvinyl alcohol is directionally arranged by taking the fluorinated graphene nanosheet as the center, so that the crystallinity is increased; the composite material disclosed by the invention is biodegradable and has excellent electrical insulation property, thermal property and stability.

Description

technical field [0001] The invention relates to a polymer composite material and a preparation method thereof. Background technique [0002] Polymer material refers to a high molecular weight (usually up to 10-106) compound formed by repeated connection of many identical and simple structural units through covalent bonds. And polymer composites (polymer composites), also known as polymer-based composites, is to add reinforcing substances to the polymer to increase the desired properties. [0003] Polyvinyl alcohol is a typical representative of many widely used polymer materials. It is a non-toxic, odorless, biodegradable linear polymer with good mechanical, chemical and thermal stability. In recent years, it has been widely used in film adhesives, hydrogels, optoelectronics and other application substrates, as well as pharmaceutical and biological fields. However, polyvinyl alcohol has weak thermal and mechanical properties. Therefore, improving the thermal and mechanica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08K3/04C08J5/18
CPCC08J5/18C08J2329/04C08K3/042C08K2201/011
Inventor 唐忠锋陈晓伟王建强
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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