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Nano-cellulose/polydopamine/polyethylene glycol composite material and preparation method thereof

A technology of nanocellulose and polyethylene glycol, applied in the field of nanocomposite materials, can solve the problems of ineffective dispersion and limited wide application, and achieve the effects of preventing irreversible aggregation, good dispersion and good thermal stability

Inactive Publication Date: 2018-08-21
ENERGY RES INST CO LTD HENAN ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the fact that the surface of CNCs is rich in hydroxyl groups, high polarity, and strong hydrogen bonding, irreversible agglomeration easily occurs, resulting in the inability to effectively disperse into the matrix to be reinforced, and more storage and use in the form of a suspension. which limits its wide application

Method used

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  • Nano-cellulose/polydopamine/polyethylene glycol composite material and preparation method thereof
  • Nano-cellulose/polydopamine/polyethylene glycol composite material and preparation method thereof
  • Nano-cellulose/polydopamine/polyethylene glycol composite material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0023] A nanocellulose / polydopamine / polyethylene glycol composite material, which is modified by polydopamine on the surface of nanocellulose, and then grafted with polyethylene glycol, the polyethylene glycol is amino or mercapto-modified and Methoxy-terminated polyethylene glycol, the mass ratio of nanocellulose, polydopamine, and polyethylene glycol is 5.5:1:2, and the molecular weight of polyethylene glycol is 2000.

[0024] The method for preparing nanocellulose / polydopamine / polyethylene glycol composite material comprises the following steps:

[0025] 1) At 25°C, under non-airtight conditions (that is, the reaction vessel is not corked or opened, so that the subsequent reaction liquid surface is always in contact with the air, so that oxygen can enter the reaction system), the stirring speed is 600 r / min , add 0.2g three ( Mix hydroxymethyl)aminomethane and 0.6g dopamine hydrochloride, react for 24 hours, centrifuge at a centrifugal speed of 10,000r / min for 10 minutes, ...

Embodiment 2

[0028] A nanocellulose / polydopamine / polyethylene glycol composite material, which is modified by polydopamine on the surface of nanocellulose, and then grafted with polyethylene glycol, the polyethylene glycol is amino or mercapto-modified and Methoxy-terminated polyethylene glycol, the mass ratio of nanocellulose, polydopamine, and polyethylene glycol is 5.5:1:3.2; the molecular weight of polyethylene glycol is 5000.

[0029] The method for preparing nanocellulose / polydopamine / polyethylene glycol composite material comprises the following steps:

[0030] 1) At 25°C, under non-airtight conditions (that is, the reaction vessel is not corked or opened, so that the subsequent reaction liquid surface is always in contact with the air, so that oxygen can enter the reaction system), the stirring speed is 600 r / min , to 150g of nanocellulose aqueous suspension with a concentration of 0.75wt% (diameter of nanocellulose: 5-20 nm, length: 200-800 nm, surface carboxyl content 1.2 mmol / g)...

Embodiment 3

[0033] A nanocellulose / polydopamine / polyethylene glycol composite material, which is modified by polydopamine on the surface of nanocellulose, and then grafted with polyethylene glycol, the polyethylene glycol is amino or mercapto-modified and Methoxy-terminated polyethylene glycol, the mass ratio of nanocellulose, polydopamine, and polyethylene glycol is 10:1:4; the molecular weight of polyethylene glycol is 5000.

[0034]The method for preparing nanocellulose / polydopamine / polyethylene glycol composite material comprises the following steps:

[0035] 1) At 25°C, under non-airtight conditions (that is, the reaction vessel is not corked or opened, so that the subsequent reaction liquid surface is always in contact with the air, so that oxygen can enter the reaction system), the stirring speed is 600 r / min , to 140g concentration of 1.0wt% nanocellulose aqueous suspension (diameter of nanocellulose: 5 ~ 20 nm, length: 200 ~ 800 nm, surface carboxyl content 1.2 mmol / g) sequential...

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Abstract

The invention discloses a nano-cellulose / polydopamine / polyethylene glycol composite material. The nano-cellulose / polydopamine / polyethylene glycol composite material is prepared by modifying the surface of nano-cellulose through polydopamine and is grafted with polyethylene glycol; the polyethylene glycol is the polyethylene glycol which is subjected to amination or sulfhydrylation modification orterminated by methoxyl. Meanwhile, the invention provides a corresponding preparation method. The nano-cellulose / polydopamine / polyethylene glycol composite material disclosed by the invention can be dispersed in polar solvents, such as water, N',N-dimethylformamide, dimethyl sulfoxide or ethyl alcohol, again; the dispersibility is high; a settlement phenomenon is avoided; the thermal stability ishigh; moreover, the composite material is only limited to modify the surface of the nano-cellulose (CNCs); the structures of nano-crystals of the CNCs are not influenced.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite materials, and in particular relates to a nanocellulose / polydopamine / polyethylene glycol composite material and a preparation method thereof. Background technique [0002] Nanocellulose (cellulose nanocrystals, Cellulose Nanocrystals, CNCs) is a kind of spindle-shaped, high aspect ratio one-dimensional nanomaterials with a length of several hundred nanometers and a width of tens of nanometers. Made after hydrolysis. CNCs has ultra-high Young's modulus, tensile strength and extremely low coefficient of thermal expansion. It can be used as a high-performance material reinforcement and has potential applications in gel materials, membrane materials, polymer biomedical materials, etc. ( Habbi Y, et al., Chemical Reviews, 2010, 110(6), 3479-3500). However, due to the fact that the surface of CNCs is rich in hydroxyl groups, high polarity, and strong hydrogen bonding, irreversible agglomeration ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00
CPCC08G81/00
Inventor 雷廷宙张修强董莉莉张艳彩吴清林任素霞李自杰孙堂磊
Owner ENERGY RES INST CO LTD HENAN ACADEMY OF SCI
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