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Method for preparing reinforced fluoropolymer composites comprising surface functionalized nanocrystalline cellulose

A nano-microcrystalline and cellulose technology, applied in the field of nano-microcrystalline cellulose, can solve the problems of limited filler properties and difficult dispersion

Inactive Publication Date: 2013-10-30
XEROX CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these fillers are limited in nature
Although NCCs can be effective filler substitutes, it remains a challenge to chemically functionalize NCC surfaces in a manner that preserves NCC morphology and crystal structure.
Furthermore, although NCCs can form stable suspensions in aqueous media, they are still poorly dispersible in nonpolar solvents or polymers

Method used

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  • Method for preparing reinforced fluoropolymer composites comprising surface functionalized nanocrystalline cellulose
  • Method for preparing reinforced fluoropolymer composites comprising surface functionalized nanocrystalline cellulose
  • Method for preparing reinforced fluoropolymer composites comprising surface functionalized nanocrystalline cellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0090] 1. A method of preparing a reinforced fluoropolymer composite, the method comprising:

[0091] reacting the surface of nanocrystalline cellulose with a fluorinated electrophile to form fluorine-functionalized nanocrystalline cellulose, wherein the periphery of the nanocrystalline cellulose is functionalized with a fluorine-containing substrate; and

[0092] The fluorofunctionalized nanocrystalline cellulose is contacted with a fluoropolymer to form a fluoropolymer composite.

[0093] 2. The method of 1 above, wherein the reaction of the fluorinated electrophile and the nanocrystalline cellulose is carried out under heterogeneous conditions.

[0094] 3. The method of 1 above, wherein the nanocrystalline cellulose is rod-shaped crystalline nanoparticles having a crystal structure.

[0095] 4. The method of 1 above, wherein the reaction of the surface of the nanocrystalline cellulose with the fluorinated electrophile does not reduce the size of the nanocrystalline cellulo...

Embodiment 1

[0131] Example 1 - Functionalization of NCC surfaces using perfluoroalkyldimethylchlorosilanes

[0132] The suspension with the desired amount of nanocrystalline cellulose (2 g in 100 g of methanol; 2% by weight) was solvent exchanged into acetone by several successive centrifugations and redispersions and subsequently dried toluene. Sonication was performed after each solvent exchange. The suspension was transferred to a three-neck round bottom flask and filled with argon. Excess heptadecafluoro-1,1,2,2-tetrahydrodecyldimethylchlorosilane (purchased from Gelest Inc.) was added dropwise to the stirring suspension. A solution of an organic amine base (eg imidazole) is added dropwise after the addition of the silane and the reaction temperature is monitored so that the reaction does not exceed 50°C. The reaction was stirred at room temperature for 16 hours. Subsequently, the modified material was separated by centrifugation and washed with ethanol four times at 10000 rpm per ...

Embodiment 2

[0133] Example 2 - Functionalization of NCC surfaces using 2H,2H,3H,3H-perfluorodecanoic acid

[0134] The suspension with the desired amount of nanocrystalline cellulose (2 g in 100 g of methanol; 2% by weight) was solvent exchanged into acetone by several successive centrifugations and redispersions and subsequently dried to toluene. Sonication was performed after each solvent exchange. The suspension was transferred to a three-neck round bottom flask and excess 2H,2H,3H,3H-perfluorodecanoic acid (purchased from SynQuest Laboratories) was added to the stirring suspension followed by a catalytic amount of p-toluenesulfonate acid. Surface modification of cellulose nanostructures was performed at 105°C for up to 24 hours. After surface treatment, the material was purified and dried in the same manner as in Example 1.

[0135] Formation of the NCC complex

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Abstract

A method of preparing a reinforced fluoropolymer composite is presented, which includes reacting a surface of a nanocrystalline cellulose with a fluorinated electrophile to form a fluoro-functionalized nanocrystalline in which the outer circumference of the nanocrystalline cellulose has been functionalized with fluorinated substrates, and contacting the fluoro-functionalized nanocrystalline cellulose with a fluoropolymer to form a fluoropolymer composite. Also presented is a method of preparing fluoro-functionalized nanocrystalline cellulose, including reacting a surface of a nanocrystalline cellulose with a fluorinated electrophile forming fluoro-functionalized nanocrystalline cellulose in which the outer circumference of the nanocrystalline cellulose has been functionalized with fluorinated substrates, precipitating the fluoro-functionalized nanocrystalline cellulose and isolating and purifying the fluoro-functionalized nanocrystalline cellulose.

Description

technical field [0001] The present invention relates generally to nanocrystalline cellulose, and more specifically to the preparation of reinforced fluoropolymer composites and the incorporation of fluorofunctionalized nanocrystalline cellulose into polymer matrices to increase the concentration of nanocrystalline cellulose particles in composites. A method of adhesion to a fluoropolymer, wherein the periphery of the nanocrystalline cellulose is functionalized with a fluorinated substrate. Background technique [0002] Cellulose fibers and their derivatives constitute the richest available resource of renewable polymers. Cellulosic fibers are also an economically viable material due to their low cost, availability, renewability and physical properties. Accordingly, their ability to act as reinforcing agents has been extensively studied. [0003] Cellulose is commonly used as a building material (wood), natural fabrics (cotton and flax), and in paper and cardboard. Further...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/12C08L27/16C08L27/20C08L27/18C08L101/04C08L1/00
CPCC08J7/12C08J5/06C08L27/16C08L27/12C08L27/18C08L27/20C08L101/04C08L1/02C08B15/05C08K9/04C08J5/045C08J2327/12C08L51/02
Inventor B·杜利齐愉C·穆尔勒格张琪
Owner XEROX CORP
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