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Super folding-resistant nano cellulose film and preparation method thereof

A technology of nano-cellulose and super-folding resistance, which is applied in the field of super-folding-resistant nano-cellulose film and its preparation, can solve problems such as low folding resistance, and achieve excellent folding resistance, thermal stability, and good thermal stability. Effect

Active Publication Date: 2019-12-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low folding resistance severely restricts the application of nanocellulose transparent films in flexible electronic devices

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Add 30g of cotton fiber to 400mL alcohol solution dissolved with 30g of chloroacetic acid and 20g of sodium hydroxide and heat to 85°C for 90min. After the reaction, wash with deionized water;

[0027] (2) Add the washed slurry to deionized water to disperse it, and then homogenize it twice under the pressure of 20,000 psi to prepare nanocellulose (the degree of polymerization is 500-1000, and the length is 0.8-4 μm);

[0028] (3) After diluting the nanocellulose fibers to a mass concentration of 0.1% with deionized water, add them to a petri dish and evaporate and dry them at 45°C to prepare a super-fold-resistant nanocellulose film. The thickness is 65μm, the number of folding times is 24332, the tensile strength is 182MPa, the light transmittance is 91%, the initial thermal degradation temperature is 267°C, and the yellowing value (ΔYI) is 2.2% after heating at 150°C for 20 minutes.

Embodiment 2

[0030] (1) Add 30g of cotton fiber to 400mL of alcohol solution dissolved with 30g of chloroacetic acid and 30g of sodium hydroxide and heat to 90°C for 90min. After the reaction, wash with deionized water;

[0031] (2) Add the washed slurry to deionized water to disperse it, and then homogenize it twice under the pressure of 20,000 psi to prepare nanocellulose (the degree of polymerization is 500-1000, and the length is 0.8-4 μm);

[0032] (3) After diluting the nanocellulose fibers to a mass concentration of 0.1% with deionized water, add them to a petri dish and evaporate and dry them at 45°C to obtain a super-fold-resistant nanocellulose transparent film. The thickness is 71μm, the number of folding times is 29122, the tensile strength is 171MPa, the light transmittance is 88%, the initial thermal degradation temperature is 282°C, and the yellowing value (ΔYI) is 1.9% after heating at 150°C for 20 minutes.

Embodiment 3

[0034] (1) Add 30g of hardwood fiber to an alcohol solution in which 10g of chloroacetic acid and 10g of sodium hydroxide are dissolved and heat it to 80°C for 90 minutes, and wash it with deionized water after the reaction;

[0035] (2) Add the washed slurry to deionized water to disperse it, and then homogenize it twice under the pressure of 20,000 psi to prepare nanocellulose (the degree of polymerization is 500-1000, and the length is 0.8-4 μm);

[0036] (3) After diluting the nanocellulose fibers to a mass concentration of 0.1% with deionized water, add them to a petri dish and evaporate and dry them at 45°C to obtain a super-fold-resistant nanocellulose transparent film. The thickness is 60μm, the number of folding times is 22332, the tensile strength is 162MPa, the light transmittance is 92%, the initial thermal degradation temperature is 264°C, and the yellowing value (ΔYI) is 2.6% after heating at 150°C for 20 minutes.

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Abstract

The invention discloses a super folding-resistant nano cellulose film and a preparation method thereof, and belongs to the field of biomacromolecule materials. The preparation method comprises the following steps: (1) carrying out carboxymethylation modification of cellulose fibers; (2) adding water into the carboxymethylation modified fibers for dispersing, and carrying out high-pressure homogenization treatment to obtain nano cellulose fibers; and (3) diluting the nano-crystalline cellulose fibers with water, adding the diluted nano-crystalline cellulose fibers into a culture dish for evaporation drying to obtain the super-folding-resistant nano cellulose film. The nano cellulose film is capable of maintaining high polymerization degree and length of the fibers in preparation process; folding resistance is 20000 to 40000; tensile strength is 150-220 MPa, the light transmittance is larger than 90%, the thermal stability is good (the initial thermal degradation temperature is 250 DEGC or above), the yellowing index value (delta YI) is smaller than 3% after heating for 20 min at the temperature of 150 DEG C, and therefore the application prospects in the fields of energy sources,electronic devices and the like is promising.

Description

technical field [0001] The invention belongs to the field of biopolymer materials, and in particular relates to a super-folding-resistant nano-cellulose film and a preparation method thereof. Background technique [0002] In recent years, nanocellulose transparent films have been developed due to their unique properties (such as high light transmittance, excellent mechanical properties, good thermal stability, and excellent barrier properties) [Nakagaito A N, Nogi M, Yano H. Displays from transparent film of natural nanofibers [J]. MRS Bull, 2010, 35(3): 214-218]. [Zhu H, Xiao Z, Liu D, et al. Biodegradable transparent substrates for flexible organic-light-emitting diodes [J]. Energ. Environ. Sci, 2013, 6(7):2105-2111.], is expected to be used as a New substrate materials are applied to the next generation of flexible green electronic devices, promoting the development of electronic devices in the direction of flexibility, low cost, and degradability, and realizing the sust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B11/12C08J5/18
CPCC08B11/12C08J5/18C08J2301/28
Inventor 方志强刘宇胡稳李博
Owner SOUTH CHINA UNIV OF TECH
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