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Method for preparing cellulose-reinforced nano-composite fiber membrane by electrostatic spinning

A nano-composite fiber and electrospinning technology, which is applied in fiber processing, filament/thread forming, textiles and papermaking, etc., can solve the problems of difficult film formation, poor thermal stability and poor compatibility of PMMA fiber films, and achieve improved Effects of mechanical properties, thermal properties, and excellent usability

Inactive Publication Date: 2016-04-20
NORTHEAST FORESTRY UNIVERSITY
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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 solve the problems that the PMMA fiber film prepared by the existing method is difficult to form a film, has poor thermal stability, and the compatibility between non-polar PMMA and polar CNC is poor. Composite Fiber Film Method

Method used

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  • Method for preparing cellulose-reinforced nano-composite fiber membrane by electrostatic spinning
  • Method for preparing cellulose-reinforced nano-composite fiber membrane by electrostatic spinning
  • Method for preparing cellulose-reinforced nano-composite fiber membrane by electrostatic spinning

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specific Embodiment approach 1

[0029] Embodiment 1: The method for preparing cellulose-reinforced nanocomposite fiber film by electrospinning in this embodiment is carried out according to the following steps:

[0030] 1. Mix 20-40g of microcrystalline cellulose and 160-400g of sulfuric acid solution, stir for 1-2 hours to obtain a mixed solution, add 10-20 times the mass of the mixed solution to dilute with deionized water to obtain a suspension, and place the suspension at 4 Stand still at ℃ for 24 hours, remove the settled CNC in the lower layer, add deionized water and centrifuge for 10-20 minutes, repeat the washing for 3 times to obtain a weakly acidic suspension, and then place the weakly acidic suspension in a dialysis bag for dialysis , until the pH value is 7, and then ultrasonically disperse for 5 to 10 minutes to obtain a CNC aqueous suspension;

[0031] 2. Put 200-300ml of CNC aqueous suspension into a flask, add an equal volume of dimethylformamide (DMF) and stir evenly to obtain CNC / H 2 O / DM...

specific Embodiment approach 2

[0035] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the mass concentration of the sulfuric acid solution in Step 1 is 64%. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0036]Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that in step 1, deionized water with a mass of 12 to 18 times the mass of the mixed solution is added for dilution. Others are the same as those in the first or second embodiment.

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Abstract

The invention belongs to the field of composite membrane preparation and relates to a method for preparing a composite fiber membrane, in particular to a method for preparing a cellulose-reinforced nano-composite fiber membrane by electrostatic spinning, aiming to solve the problems that a PMMA (polymethyl methacrylate) fiber membrane prepared by an existing method is difficult to form, poor in thermal stability and poor in nonpolar PMMA and polar CNC (cellulose nanocrystal) compatibility. The method includes firstly, preparing CNC water suspension; secondly, preparing electrostatic spinning liquid; thirdly, filling an injector with the electrostatic spinning liquid and performing electrostatic spinning so as to obtain the cellulose-reinforced nano-composite fiber membrane. Fibers prepared by the method are smooth in surface and uniform in diameter; along with increase of CNC addition amount, the fiber diameters are decreased gradually and are narrowed in distribution, and a TGA (thermal gravity analysis) curve of nano-composite fibers moves towards a high temperature direction, so that thermal properties of the nano-composite fibers are enhanced. The maximum tensile strength of the prepared fiber membrane can reach 0.3MPa.

Description

technical field [0001] The invention relates to a method for preparing a composite fiber film. Background technique [0002] Cellulose is an inexhaustible and most abundant natural high-quality material mainly synthesized by plants through photosynthesis in nature. In recent years, cellulose nanocrystals (CNC) extracted from cellulose have attracted research interest because of their large specific surface area, easy chemical modification, biocompatibility, and easy compounding to impart new functions. And it is widely used as nano-filler to prepare high-performance composites. Studies have shown that: the high crystallinity and nanoscale effect of CNC, combining it with the polymer matrix can not only significantly enhance the mechanical properties of the polymer, but also improve the thermal stability of the polymer and realize the controllable performance of the composite material. [0003] Polymethyl methacrylate (PMMA) is a polymer with high transparency and good proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/4382D04H1/728D04H1/425D01D5/00
CPCD01D5/0092D04H1/425D04H1/4382D04H1/728
Inventor 倪晓慧韩广萍程万里宦思琪李超刘国相
Owner NORTHEAST FORESTRY UNIVERSITY
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