Preparation method of polylactic acid fiber composite surface porous film material

A technology of polylactic acid fiber and composite surface, which is applied in the direction of carbon fiber, fiber treatment, natural fiber, etc., can solve the problems of slow degradation rate of protease degradation liquid, unstable biological enzyme activity, unstable preparation effect, etc., achieving short time consumption, Strong stability and large specific surface area

Active Publication Date: 2018-06-29
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the activity of the biological enzyme is unstable, it is easily affected by various external factors, and it has biological activity within a specific time, so it is necessary to replace the protease regularly

Method used

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  • Preparation method of polylactic acid fiber composite surface porous film material
  • Preparation method of polylactic acid fiber composite surface porous film material
  • Preparation method of polylactic acid fiber composite surface porous film material

Examples

Experimental program
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Example Embodiment

[0026] Example 1

[0027] 1) Weigh 5g of polylactic acid (PLA) with a number average molecular weight of 200,000 Daltons, stir and dissolve in 150mL of dichloromethane, and obtain a polylactic acid solution with a concentration of 2.5wt% at room temperature;

[0028] 2) Immerse the carbon nanofibers (NCF) in the polylactic acid solution with a concentration of 2.5 wt% in step 1), take out after dipping for 50 seconds, and place them in a fume hood to dry naturally.

[0029] figure 1 Schematic diagram of the dip coating method of the polylactic acid fiber composite surface porous film material, figure 2 The SEM image of a typical polylactic acid porous film on the surface of the NCF which is a polylactic acid fiber composite surface porous film material. It can be seen from the SEM image that there are many polylactic acid membranes with nearly circular pores, and these pores are evenly distributed. Most of the holes are 1-31 μm in diameter, and seem to be separated from each other,...

Example Embodiment

[0032] Example 2

[0033] 1) Weigh 5 g of polylactic acid (PLA) with a number average molecular weight of 250,000 Daltons, and dissolve it in 125 mL of dichloromethane under stirring, to obtain a polylactic acid solution with a concentration gradient of 3.0 wt% at room temperature;

[0034] 2) Immerse the carbon nano fiber (NCF) in the polylactic acid solution with a concentration of 3.0% by weight in step 1), take it out after 60 seconds, and place it in a fume hood to dry naturally.

[0035] image 3 It is the SEM image of different pores in the polylactic acid fiber composite surface porous membrane material. As shown in the figure, there are other different pore arrangements on the surface of the NFC fiber, showing different pore morphologies: A is non-circular and deformed The pores of B are shallow pores, indicating that they only contain polymer and air and the NCF fibers under the polymer pores are not visible; C is the "complete" porous structure, which means that the fibers...

Example Embodiment

[0036] Example 3

[0037] 1) Weigh 5 g of polylactic acid (PLA) with a number average molecular weight of 250,000 Daltons, and dissolve it in 100 mL of dichloromethane under stirring, and obtain a polylactic acid solution with a concentration gradient of 3.5 wt% at room temperature;

[0038] 2) Immerse the carbon nano fiber (NCF) in the polylactic acid solution with a concentration of 3.5% by weight in step 1), take it out after 60 seconds, and place it in a fume hood to dry naturally.

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Abstract

The invention belongs to the field of high polymer material sciences, and concretely relates to a preparation method of apolylactic acid fiber composite surface porous film material. The preparation method provided by the invention comprises the steps of dip-coating a fiber into a polylactic acid solution, and air-drying, wherein the mass percent concentration of polylactic acid in the polylacticacid solution is 1 weight percent to 5 weight percent, and the dip-coating time is 50s to 80s. The method provided by the invention is simple and economical in process, convenient and fast to operate,and short in consumed time; the obtained polylactic acid fiber composite surface porous film is a highly ordered and porous material with high stability and large specific surface area, is green without pollution, can be widely applied to the biological medicinessuch as industrial catalysis, biological medicines, fuel cellproton exchange membranes, and high-endisolation techniques as well as thetechnologies such as fuel cellproton exchange membranes, and high-endisolation techniques.

Description

technical field [0001] The invention belongs to the field of polymer material science, and in particular relates to a preparation method of polylactic acid fiber composite surface porous membrane material. Background technique [0002] Porous material refers to a solid with a certain number of holes. Its typical structure is mainly a two-dimensional structure composed of a large number of polygonal holes gathered on a plane. The shape is similar to the hexagonal structure of a honeycomb and is called "honeycomb". A three-dimensional structure formed by the accumulation of polyhedral-shaped pores in space, commonly referred to as a "foam" material. Due to its special porous structure, porous materials have many excellent physical and chemical properties such as high specific surface area, high permeability, and assembleability, and can be widely used in the fields of chemical industry, biomedicine, environmental protection, and functional materials. [0003] According to the...

Claims

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Application Information

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IPC IPC(8): D06M15/507D06M101/40D06M101/02
CPCD06M15/507D06M2101/02D06M2101/40
Inventor 岳航勃郭建维郑萍璇杨楚芬
Owner GUANGDONG UNIV OF TECH
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