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Thermosensitivity/pH dual-response intelligent nano-fiber material and preparation method and application thereof

A nanofiber, dual-response technology for fiber processing, plant fibers, textiles, and paper making to address issues such as impact

Active Publication Date: 2019-05-31
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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  • Thermosensitivity/pH dual-response intelligent nano-fiber material and preparation method and application thereof
  • Thermosensitivity/pH dual-response intelligent nano-fiber material and preparation method and application thereof

Examples

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Embodiment 1

[0033] The preparation of the temperature-sensitive / pH dual-response intelligent nanofiber material of the present invention, the specific steps are as follows:

[0034] 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.

[0035] 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.

[0036] ③Pr...

Embodiment 2

[0040] The preparation of the temperature-sensitive / pH dual-response intelligent nanofiber material of the present invention, the specific steps are as follows:

[0041] 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.

[0042] 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....

Embodiment 3

[0047] The preparation of the temperature-sensitive / pH dual-response intelligent nanofiber material of the present invention, the specific steps are as follows:

[0048] 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.

[0049] 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.

[0050] ③Prepa...

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Abstract

The invention provides a thermosensitivity / pH dual-response intelligent nano-fiber material and a preparation method and application thereof. Two thermosensitive monomers of 2-(2-methoxyl ethyoxyl)ethyl methacrylate and oligomerization (glycol)methyl ether methacrylate are adopted for modifying hyperbranched polyamide at the same time, the monomers are grafted to cellulose nano-fiber, and the thermosensitivity / pH dual-response intelligent nano-fiber material with the good pH responsiveness and temperature responsiveness is prepared. The material can achieve super-hydrophilic and super-hydrophobic intelligent conversion and super-oleophylic and super-oleophobic intelligent conversion, and the low-clinic dissolving temperature of the material can achieve controllable regulation within the range of 37-50 DEG C. The thermosensitivity / pH dual-response intelligent nano-fiber material can be widely applied to the fields of medicine slow release and oil and water separation.

Description

technical field [0001] The invention belongs to the technical field of nanofiber modification, and in particular relates to a temperature-sensitive / pH dual-response intelligent nanofiber 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 co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/61D06M11/50D06M13/355C08G83/00C08B15/04C08B15/02D06M101/04
Inventor 何辉史霄宇林杰涵陈杏娟黄凌涛侯旭东
Owner GUANGXI UNIV