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Cellulose nano-fiber/polymethyl methacrylate composite film preparation method

A polymethyl methacrylate and nanofiber technology, applied in the direction of pulping with organic solvents, can solve the problems of multi-energy, low aspect ratio, fiber interruption, etc., and achieve excellent mechanical properties and rich sources of raw materials , The effect of thermal performance improvement

Inactive Publication Date: 2013-11-20
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mechanical treatment method has the advantages of convenience and environmental protection, but it is easy to cause the fibers to be interrupted due to excessive shear force through the mechanical treatment method, which also leads to the low aspect ratio of the obtained cellulose nanofibers and affects the organic high-density fiber. Improvement of various performances when molecular materials are combined
In addition, purely mechanical methods consume more energy, which is also not conducive to industrial production.
[0008] Chemical-mechanical method: The diameter distribution of cellulose nanofibers obtained by simple chemical methods or mechanical separation methods is wide and the length is short, so the aspect ratio is not very large, and the effect is not very good when reinforcing polymers

Method used

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  • Cellulose nano-fiber/polymethyl methacrylate composite film preparation method
  • Cellulose nano-fiber/polymethyl methacrylate composite film preparation method
  • Cellulose nano-fiber/polymethyl methacrylate composite film preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of cellulose nanofiber / polymethyl methacrylate composite membrane: step 1) raw material treatment, take poplar wood powder, and use a combination of sieves with apertures of 60 mesh and 70 mesh to screen to obtain wood powder with a fineness of 60 to 70 mesh, and then Take by weighing 15g wherein for subsequent use, measure the toluene of 220ml and the ethanol of 110ml with measuring cylinder, mix the two and pour in the flask of Soxhlet extractor, put into Soxhlet extractor to 15g wood powder, carry out benzene Alcohol extraction treatment, the temperature is controlled at 120 °C, and the time is 6 h. After extraction, the wood powder is taken out, placed in a petri dish, and dried naturally in a fume hood for 24 h.

[0027]Step 2) Chemical treatment: Weigh 10 g of extracted wood flour, add appropriate amount of distilled water to filter several times, then put it into a beaker and add 500 ml of distilled water, 3 ml of glacial acetic acid and 3 g of sodiu...

Embodiment 2

[0039] Weigh 10 g of extracted wood powder, add appropriate amount of distilled water and filter several times. After the last pass of filtration is completed, put it into a beaker and add 500 ml of distilled water, 3 ml of glacial acetic acid and 3 g of sodium chlorite. Then heat treatment in a water bath in a collector type magnetic heating stirrer for 1 h at a temperature of 75°C. After the reaction was completed, 3 ml of glacial acetic acid and 3 g of sodium chlorite were added, and the reaction was continued under the same conditions for 1 h. This step was repeated 5 times in total. After the reaction is complete, use distilled water to filter and wash repeatedly until the pH value of the aqueous suspension is close to 7.

Embodiment 3

[0041] Prepare 500 ml of potassium hydroxide solution with a mass concentration of 3%, put the sample prepared in Example 1 into a beaker and pour it into the prepared solution, and then heat it in a water bath for 2 hours at a temperature of 90°C. After the reaction was finished, it was repeatedly filtered and washed with distilled water until the pH value of the aqueous suspension was close to 7.

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Abstract

The present invention relates to a cellulose nano-fiber / polymethyl methacrylate composite film preparation method, which is characterized by comprising the following steps: 1) a raw material treatment, 2) a chemical treatment, 3) a mechanical treatment, 4) cellulose nano-fiber film preparation, and 5) cellulose nano-fiber / polymethyl methacrylate nanometer composite material preparation. According to the present invention, an average diameter of the prepared cellulose nano-fibers is less than 100 nm, the cellulose nano-fiber film has a tensile elastic modulus of 6.06 GPa, a tensile strength of 148.8 MPa, a thermal expansion coefficient of 16.72*10<-6> / K, and light transmittance of 82.1%, and the nanometer composite material film after compounding with the polymethyl methacrylate has a tensile elastic modulus of 3.61 GPa, a tensile strength of 92 MPa, a thermal expansion coefficient of 21.58*10<-6> / K, and light transmittance of 86.3%.

Description

technical field [0001] The invention relates to a preparation method of a cellulose nanofiber / polymethyl methacrylate composite film, belonging to the technical field of composite materials. Background technique [0002] Cellulose is a natural organic polymer material, which together with hemicellulose and lignin constitutes the main component of plant cells. In addition, cellulose also exists in the body of some bacteria and backpack animals. Cellulose is the most widely distributed and most abundant polysaccharide in nature, accounting for more than 50% of the carbon content in the plant kingdom. The cellulose content of cotton is close to 100%, making it the purest natural source of cellulose. In general wood, cellulose accounts for 40-50%, and there are 10-30% hemicellulose and 20-30% lignin. Hemp, wheat straw, straw, bagasse, etc. are all rich sources of cellulose. Cellulose is an important raw material for papermaking. [0003] In plant cells, cellulose does not ...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L1/02C08L33/12D21C3/20
Inventor 李大纲陈振东李雪婷薛莹莹潘佳李明珠胡月
Owner NANJING FORESTRY UNIV
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