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Method for preparing biodegradable solid-solid phase transition nano fibers or fiber membranes

A nanofiber, fiber membrane technology, applied in fiber processing, fiber chemical characteristics, spinning solution preparation, etc., can solve the problems of strict spinning conditions, and achieve the effect of strong application potential, strong operability, and easy control.

Inactive Publication Date: 2011-02-09
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Xia research group (Jesse T.McCann, Manuel Marquez, Younan Xia.Meltcoaxial electrospinning: A versatile method for the encapsulation of solid materials and fabrication of phase change nanofibers. Nano Lett., 2006, 6(12): 2868-2872) used electrospinning Phase-change nanofibers with PCM as the core layer are prepared by the silk method. The disadvantage is that a special coaxial electrospinning device is required, and the spinning conditions are relatively strict.

Method used

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  • Method for preparing biodegradable solid-solid phase transition nano fibers or fiber membranes

Examples

Experimental program
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Effect test

Embodiment 1

[0030] First mix the oxalic acid and CNC aqueous dispersion (16.1mg / mL) evenly, then add DMAP, wherein the reaction ratio of CNC, oxalic acid and DMAP is 1:1.2:0.04; then DCC ethanol solution (15mg / mL) Slowly add it dropwise to the above dispersion liquid, the ratio of CNC and DCC is 1:0.3~0.6, and react with magnetic stirring at room temperature for 6 hours; the product is repeatedly washed and centrifuged with deionized water and absolute ethanol, and then prepared into CNC - Aqueous dispersion of COOH.

[0031] Add PEG (the average molecular weight is 6000) and DMAP to the above-mentioned dispersion solution in turn, wherein the reaction ratio of CNC-COOH, PEG and DMAP is 1:3.5:0.05; the ethanol solution of DCC (15mg / mL ), the ratio of CNC-COOH to DCC was 1:0.3-0.6, and the reaction was continued at 70°C for 12 hours; the product was repeatedly washed with deionized water and anhydrous ether, centrifuged, and vacuum-dried to obtain PEG-g-CNC.

[0032] Then the above-mentio...

Embodiment 2

[0034] After mixing the aqueous dispersion (18mg / mL) of succinic acid and CNC evenly, add DBTL, wherein the reaction ratio of CNC, succinic acid and DBTL is 1:1:0.2; then the ethanol solution of DCC (15mg / mL) was slowly added dropwise to the above dispersion liquid, the ratio of CNC and DCC was 1:0.3~0.6, and the reaction was carried out under magnetic stirring at room temperature for 6 hours; the product was repeatedly washed and centrifuged with deionized water and absolute ethanol, and then Prepared as CNC-COOH water dispersion.

[0035] Then PEG (average molecular weight is 6000) and DBTL are sequentially added to the dispersion liquid prepared above, wherein the reaction ratio of CNC-COOH, PEG and DBTL is 1:4:0.2; the ethanol solution of DCC (15 mg / mL), the ratio of CNC-COOH and DCC was 1:0.3-0.6, and the reaction was continued at 80°C for 10 h; the product was repeatedly washed with deionized water and anhydrous ether, centrifuged, and vacuum-dried to obtain PEG-g-CNC....

Embodiment 3

[0038] First mix the oxalic acid and CNC aqueous dispersion (17mg / mL) evenly, then add DMAP, wherein the reaction ratio of CNC, oxalic acid and DMAP is 1:1:0.04; then DCC ethanol solution (15mg / mL) slowly Add dropwise to the above dispersion liquid, the ratio of CNC and DCC is 1:0.3~0.6, and react with magnetic stirring at room temperature for 6 hours; the product is repeatedly washed and centrifuged with deionized water and absolute ethanol, and then prepared into CNC- Aqueous dispersion of COOH.

[0039] Then PEG (average molecular weight is 4000) and DMAP are added in the dispersion liquid of above-mentioned preparation successively, wherein the reaction proportion of CNC-COOH, PEG and DMAP is 1: 3.5: 0.06; The ethanol solution of DCC (15mg / mL), the ratio of CNC-COOH and DCC was 1:0.3-0.6, and the reaction was continued at 60°C for 10 h; the product was repeatedly washed with deionized water and anhydrous ether, centrifuged, and vacuum-dried to obtain PEG-g-CNC.

[0040] ...

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Abstract

The invention relates to a method for preparing biodegradable solid-solid phase transition nano fibers or fiber membranes, which comprises: (1) adding a coupling agent and a catalyst into water dispersion of cellulose nanocrystals in turn, dripping dehydrant-containing ethanol solution, stirring, reacting for 6 to 10 hours to prepare water dispersion of carboxyl cellulose nanocrystals; (2) adding PEG and a catalyst into the water dispersion of carboxyl cellulose nanocrystals in turn, dripping the dehydrant-containing ethanol solution, stirring and reacting for 10 to 12 hours to obtain polyethylene glycol grafted cellulose nanocrystal graft copolymer; and (3) preparing aqueous solution of the graft copolymer as spinning solution and spinning. In the invention, the cost is low, the whole preparation process is performed in a water system, the preparation process is simple, easy to control and suitable for industrial production; and the obtained biodegradable solid-solid phase transition nano fibers or fiber membranes have the advantages of high storage capacity and proper phase transition temperature and the like.

Description

technical field [0001] The invention belongs to the field of preparation of phase-change nanofibers, in particular to a preparation method of biodegradable solid-solid phase-change nanofibers or fiber membranes. Background technique [0002] Phase change materials (PCM) is a widely used energy storage material that uses the thermal effect of the phase change process to store and release energy. It has high energy storage density, high thermal efficiency, and constant temperature absorption and release. Process, easy process control and so on. Polyethylene glycol (PEG) is a kind of phase change energy storage material with high phase change enthalpy, low thermal hysteresis, no phase separation, and a wide range of phase change temperature. , It must be sealed with a container, which increases the cost of production, and also causes the risk of corrosion or environmental pollution due to the leakage of the liquid phase, which limits its application range. Chemically modifyin...

Claims

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Application Information

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IPC IPC(8): D01D1/02C08G81/00C08G65/48D01F6/96D01D5/00C08L87/00C08B3/12
Inventor 秦宗益余厚咏张天鹭刘彦男周哲
Owner DONGHUA UNIV
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