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Cellulose nanocrystal hydrophobic porous powder and preparation method thereof

A technology of porous powder and nanocrystal, which is applied in the field of cellulose nanocrystal hydrophobic porous powder and its preparation, can solve the problems of high energy consumption, solvent environmental pollution, etc., and achieves improved heat resistance, improved compatibility, and improved reaction conditions. mild effect

Active Publication Date: 2020-03-17
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve problems such as environmental pollution caused by solvents in the prior art, as well as high energy consumption caused by high temperature, the object of the present invention is to provide hydrophobic cellulose nanocrystal powder with a pair of pores and a green and environmentally friendly preparation method thereof

Method used

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  • Cellulose nanocrystal hydrophobic porous powder and preparation method thereof
  • Cellulose nanocrystal hydrophobic porous powder and preparation method thereof
  • Cellulose nanocrystal hydrophobic porous powder and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] 20 mL of 1% sulfonated cellulose nanocrystal water suspension was added into a three-neck flask, dilute sulfuric acid was added to adjust the pH=4, and 0.1 g of ceric ammonium nitrate and 1 g of ethyl methacrylate were added after ultrasonication. After fully stirring, keep the temperature at 65°C. After reacting for 2 hours, take it out and wash until neutral, and dry it in a blast drying oven to obtain a white cellulose nanocrystalline porous powder. The grafting rate of polyethyl methacrylate is 350%, and the grafting efficiency is 72%. The powder size is 80μm, and the average pore size is 500nm.

[0038] The photographs and scanning electron microscope photographs of the prepared cellulose nanocrystalline porous powder are as follows: figure 1 and figure 2 shown. From figure 1 It can be seen that the cellulose nanocrystalline porous powder prepared by this method is a white powder with uniform size; figure 2 It can be seen that the cellulose nanocrystalline p...

Embodiment 2

[0041] The types of raw materials used and the process flow are the same as in Example 1, except that the amount of ethyl methacrylate is 0.6 g to obtain a cellulose nanocrystalline porous powder. The measured polyethyl methacrylate grafting rate is 250%, and the grafting efficiency is 85%. The obtained cellulose nanocrystalline porous powder has an average size of 50 μm and an average pore diameter of 200 nm.

Embodiment 3

[0043] The types of raw materials used and the process flow are the same as in Example 1, except that the amount of ethyl methacrylate is 2 g to obtain a cellulose nanocrystalline porous powder. The measured polyethyl methacrylate grafting rate is 600%, and the grafting efficiency is 65%. The obtained cellulose nanocrystalline porous powder has an average size of 120 μm and an average pore diameter of 1200 nm.

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Abstract

The invention relates to cellulose nanocrystal hydrophobic porous powder and a preparation method thereof. Hydrophobic vinyl monomer polymerization is initiated on the surface of a cellulose nanocrystal by using a free radical polymerization initiating system in an aqueous medium to realize hydrophobic modification of the surface of the cellulose nanocrystal; the cellulose nanocrystal is uniformlywrapped by a polymer, so that the cellulose nanocrystal is prevented from being agglomerated due to hydrogen-bond interaction after being dried; and a complex porous network structure is formed in the powder under the skeleton supporting action of the cellulose nanocrystal. The method for preparing the cellulose nanocrystal hydrophobic porous powder is environmentally friendly, economical and efficient.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite preparation, and in particular relates to a cellulose nanocrystal hydrophobic porous powder and a preparation method thereof. Background technique [0002] Cellulose nanocrystals are rigid rod-shaped nanomaterials extracted from natural cellulose with low density, high strength, high specific surface area, and high crystallinity. They have unique advantages in improving the performance of polymer-based composite materials. However, there are a large number of hydroxyl groups on the surface of cellulose nanocrystals, which endows cellulose nanocrystals with a certain degree of hydrophilicity and makes them less compatible with hydrophobic polymer matrices. Therefore, in order to improve the compatibility between the remaining hydrophobic polymer matrices, cellulose nanocrystals need to be hydrophobically modified. [0003] A common method is to graft hydrophobic polymers on the surface of ce...

Claims

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Application Information

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IPC IPC(8): C08F251/02C08F220/18C08F212/08C08F220/32C08J9/28
CPCC08F251/02C08J9/28C08J2351/02C08F212/08
Inventor 张建明刘云霄周立娟刘乐欢段咏欣
Owner QINGDAO UNIV OF SCI & TECH
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