Preparation method of surface-grafted modified nanocellulose crystal

A surface graft modification and nanocellulose technology is applied in the field of preparation of surface graft modified nanocellulose crystals, which can solve the problems of easy agglomeration interface compatibility and the like, and achieves low cost, abundant raw material sources and simple process. Effect

Inactive Publication Date: 2013-07-24
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, and provides a method for preparing surface grafted modified nano-cellulose crystals, which can effectively solve the problem of easy agglomeration of nano-cellul

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  • Preparation method of surface-grafted modified nanocellulose crystal
  • Preparation method of surface-grafted modified nanocellulose crystal
  • Preparation method of surface-grafted modified nanocellulose crystal

Examples

Experimental program
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Example Embodiment

[0022] Example 1:

[0023] In a 250ml four-necked flask, add 120ml of toluene and 6g of nanocellulose crystals, after ultrasonic dispersion for 30 minutes, add 4g of maleic anhydride, 0.1g of 4-dimethylaminopyridine, install a stirrer, a condenser, a thermometer and a dripping solution funnel, react at 50 °C for 3 hours under stirring, then heat up to 72-73 °C, add 0.03 g BPO, and add 6 g of vinyl acetate dropwise with a dropping funnel after 30 minutes, the addition is completed within 2 hours, and the reaction is continued for 8 hours. The reaction solution was centrifuged three times, washed with acetone, and freeze-dried to obtain nanocellulose crystals with surface graft modification. The nanocomposite material is prepared by mixing the grafted modified nanocellulose crystals and polylactic acid in a solution, and the content of the grafted nanocellulose crystal powder is 6%. The tensile strength and elongation at break of the composites were determined to be 41.7MPa and...

Example Embodiment

[0024] Example 2:

[0025] In a 250ml four-necked flask, add 120ml of toluene and 6g of nanocellulose crystals, after ultrasonic dispersion for 30 minutes, add 4g of maleic anhydride, 0.1g of 4-dimethylaminopyridine, install a stirrer, a condenser, a thermometer and a dripping solution The funnel was stirred at 50 °C for 3 hours, then the temperature was raised to 72-73 °C, 0.03 g of BPO was added, and after 30 minutes, a mixed solution of 4.5 g of vinyl acetate and 1.5 g of butyl acrylate was added dropwise with a dropping funnel for 2 hours. After the inner dropwise addition, the reaction was continued for 8 hours, the reaction solution was centrifuged for three times, washed with acetone, and freeze-dried to obtain nanocellulose crystals with surface graft modification. A nanocomposite material is prepared by mixing the graft-modified nanocellulose crystal powder with polylactic acid by a solution mixing method, and the content of the grafted nanocellulose crystal powder is...

Example Embodiment

[0026] Example 3:

[0027] The preparation method of the surface graft-modified nanocellulose crystal is the same as that in Example 2. A nanocomposite material is prepared by mixing the graft-modified nanocellulose crystals and polylactic acid in a solution, and the content of the grafted nanocellulose crystal powder is 4%. The tensile strength and elongation at break of the composites were determined to be 34.2MPa and 26.1%, respectively, compared with the unmodified nanocellulose / polylactic acid composites (26MPa and 15.2%, respectively) prepared by the same method and ratio an increase of 31.5% and 71%, respectively.

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Abstract

The invention belongs to the field of cellulose modification and utilization and in particular relates to a preparation method of a surface-grafted modified nanocellulose crystal. The preparation method of the surface-grafted modified nanocellulose crystal comprises the following steps of: dispersing nanocellulose crystal in an organic solvent; introducing an unsaturated double bond onto the surface of the nanocellulose crystal through a reaction of maleic anhydride and hydroxyl groups on the surface of the nanocellulose crystal; and introducing an initiator and an unsaturated monomer to prepare the surface-grafted modified nanocellulose crystal through a radical polymerization reaction. The surface-grafted modified nanocellulose crystal is uniformly dispersed in a polymer matrix and good in compatibility with the interface of the polymer matrix, and therefore, the prepared polymer nanometer composite material has higher tensile strength and elongation at break. The preparation method of the surface-grafted modified nanocellulose crystal has the advantages of rich raw material resource, simple process, completely biodegradable product, high mechanical performance and the like, and can be used for a plurality of fields including the packaging field, the biological field, the medical field, the engineering plastic field and the like.

Description

technical field [0001] The invention belongs to the field of cellulose modification and utilization, and in particular relates to a preparation method of surface graft modified nanometer cellulose crystals. Background technique [0002] Cellulose is the most abundant natural polymer in nature. Its chemical structure is a linear polymer composed of many D-glucose groups connected by β-1, 4 glycosidic bonds. Nanocellulose, also known as nanocellulose crystals, is a rigid rod-shaped cellulose with a diameter of 1-100 nm and a length of tens to hundreds of nanometers. Compared with ordinary non-nanocellulose, due to the high purity, high crystallinity, high Young's modulus, high strength and other characteristics of nanocellulose, coupled with its light weight, biodegradability, biocompatibility and biomaterial Recycling and other characteristics make it show great application prospects in high-performance and degradable polymer-based composite materials. [0003] Due to the e...

Claims

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Application Information

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IPC IPC(8): C08F251/02C08F2/06C08B3/12C08L67/04C08L51/02
Inventor 罗卫华王正良
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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