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Multi-responsive intelligent nano fiber functional material and preparation method and application thereof

A technology of nanofibers and functional materials, applied in the field of multi-responsive smart nanofiber functional materials and their preparation, can solve problems such as influence and achieve good pH responsiveness and temperature responsiveness.

Active Publication Date: 2019-06-14
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when preparing dual-response / multi-response wettability materials, different stimuli and external interference will have a huge impact on the wettability expression of dual-response / multi-response wettability materials, and traditional dual-response smart materials cannot simultaneously Both good pH responsiveness and temperature responsiveness

Method used

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  • Multi-responsive intelligent nano fiber functional material and preparation method and application thereof
  • Multi-responsive intelligent nano fiber functional material and preparation method and application thereof

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Effect test

Embodiment 1

[0032] The preparation of the multi-responsive intelligent nanofiber functional material of the present invention, the specific steps are as follows:

[0033] ① Preparation of dialdehyde fiber: Take 4g of dry eucalyptus pulp fiber in a conical flask, add 200mL of potassium hydrogen phthalate buffer (0.05M, pH=3), then add 2.4g of sodium periodate, After wrapping with tin foil, stir at 35°C for 4 hours, and finally add 10 mL of ethylene glycol to terminate the reaction, filter and wash the product, and dry to obtain dialdehyde fibers.

[0034] ② Preparation of carboxylated cellulose nanofibers: Add 180 mL of sodium phosphate buffer solution (0.05 M, pH=6.8) to 2 g of dialdehyde fibers, and stir the suspension in a sealed flask at 500 rpm and 60 ° C, then Add 0.032g TEMPO, add 1.69M, 1.183mL sodium hypochlorite solution, then add 2.1307g sodium chlorite, oxidize for 16h, add 5mL ethanol to quench, wash and dry to obtain carboxylated cellulose nanofibers.

[0035] ③Preparation o...

Embodiment 2

[0038] The preparation of the multi-responsive intelligent nanofiber functional material of the present invention, the specific steps are as follows:

[0039] ① Preparation of dialdehyde fiber: Take 4g of absolute dry bagasse pulp fiber in a conical flask, add 200mL of potassium hydrogen phthalate buffer (0.05M, pH=3), then add 2.0g of sodium periodate, and use After wrapping in tin foil, stir at 30°C for 3.5 hours, and finally add 10 mL of ethylene glycol to terminate the reaction, filter and wash the product, and dry to obtain dialdehyde fibers.

[0040] ② Preparation of carboxylated cellulose nanofibers: Add 180 mL of sodium phosphate buffer solution (0.05 M, pH=6.8) to 2 g of dialdehyde fibers, and stir the suspension in a sealed flask at 500 rpm and 55 ° C, then Add 0.030g TEMPO, add 1.69M, 1.183mL sodium hypochlorite solution, then add 2.1307g sodium chlorite, oxidize for 15h, add 5mL ethanol to quench, wash and dry to obtain carboxylated cellulose nanofibers.

[0041] ...

Embodiment 3

[0044] The preparation of the multi-responsive intelligent nanofiber functional material of the present invention, the specific steps are as follows:

[0045] ① Preparation of dialdehyde fiber: Take 4g of dry bamboo pulp fiber in a conical flask, add 200mL of potassium hydrogen phthalate buffer (0.05M, pH=3), then add 3.0g of sodium periodate, and use After wrapping in tin foil, stir at 40°C for 4.5 hours, and finally add 10 mL of ethylene glycol to terminate the reaction, filter and wash the product, and dry to obtain dialdehyde fibers.

[0046] ②Preparation of carboxylated cellulose nanofibers: Add 180mL of sodium phosphate buffer solution (0.05M, pH=6.8) to 2g of dialdehyde fibers, and stir the suspension in a sealed flask at 500rmp and 65°C, then Add 0.035g TEMPO, add 1.69M, 1.183mL sodium hypochlorite solution, then add 2.1307g sodium chlorite, oxidize for 17h, add 5mL ethanol to quench, wash and dry to obtain carboxylated cellulose nanofibers.

[0047] ③Preparation of p...

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Abstract

The invention provides a multi-responsive intelligent nano fiber functional material and a preparation method and application thereof. The method utilizes two temperature sensitive monomers of N-isopropyl acrylamide and N-vinyl caprolactam to simultaneously modify polyethyleneimine, and re-grafts the polyethyleneimine onto cellulose nanofibers to prepare the multi-responsive intelligent nanofiberfunctional material with good pH responsiveness and temperature responsiveness. The material can achieve the intelligent transformation of super-hydrophilic and super-hydrophobic and super-lipophilicand super-oleophobic under a temperature and pH stimulus responsiveness condition, and the low critical solution temperature of the material can be controllably adjusted in the range of 30.5-31.5 DEGC. The multi-responsive intelligent nano fiber functional material can be widely applied to the fields of drug sustained release, oil-water separation and the like.

Description

technical field [0001] The invention belongs to the technical field of nanofiber modification, and in particular relates to a multi-responsive intelligent nanofiber functional material and its preparation method and application. Background technique [0002] Responsive smart materials have attracted increasing attention due to smart responsive surfaces with switchable wettability. Due to their outstanding properties in numerous applications (controlled drug delivery, cell encapsulation, oil / water separation, microfluidic channels and sensors), at the same time, with the continuous development of science and technology and surface chemistry, more and more have been developed with Smart surfaces with switchable water and / or oil wettability. As far as the change mechanism is concerned, the wettability switching of surfaces can be achieved by reversible changes in surface chemical composition and / or surface morphology of stimulus-sensitive materials in response to corresponding...

Claims

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Application Information

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IPC IPC(8): D06M15/61C08B15/04B01D17/022A61K47/38A61K47/32D06M101/06
Inventor 何辉程梅笑朱红祥梁渝廷薛飞周航
Owner GUANGXI UNIV
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