Preparation method of stereocomplex polylactic acid porous membrane material

A composite polylactic acid membrane and composite polylactic acid technology, applied in the field of polymer materials, can solve the problems of unenvironmental protection, complex preparation process, uneven product pore size distribution, etc., and achieve controllable structure, environmentally friendly preparation process, and complete biodegradability. Effect

Active Publication Date: 2017-03-15
FUDAN UNIV
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  • Claims
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Problems solved by technology

[0008] The purpose of the present invention is to provide a new method for preparing a stereocomposite polylactic acid porous membrane material in view of the shortcomings of existing polymer porous membrane materials, such as complex preparation process, uneven pore size distribution of the obtained product, and non-environmental protection.

Method used

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  • Preparation method of stereocomplex polylactic acid porous membrane material
  • Preparation method of stereocomplex polylactic acid porous membrane material
  • Preparation method of stereocomplex polylactic acid porous membrane material

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Weigh 10g of number average molecular weight to be 5×10 4 g / mol of PLLA and 0.8 g of stannous octoate were dissolved in 500 mL of anhydrous toluene. React at 80°C for 2h under nitrogen atmosphere. After the reaction is finished, the obtained product is centrifuged and vacuum-dried to obtain a high-activity prepolymer. The obtained product was mixed with 10 g D The type lactide is mixed and added to the polymerization tube, filled with nitrogen and evacuated with oxygen, vacuumized, and repeated three times. Control the vacuum in the polymerization tube to be below 150 Pa, and react at 140°C for 72 hours to obtain stereocomplex polylactic acid.

[0032] (2) Dissolve the stereocomplex polylactic acid prepared in step (1) in chloroform at a concentration of 5g / 150mL. After fully dissolving, pour the solution into a quartz vessel, pour and volatilize to form a film.

[0033] (3) Prepare 0.1mol / L Tris solution and 0.1mol / L HCl solution, then take 500mL of 0.1mol / L Tr...

Embodiment 2

[0038] (1) Weigh 8g of the number average molecular weight of 1 × 10 5 g / mol of PDLA and 0.6 g of stannous octoate were dissolved in 500 mL of anhydrous toluene. React at 80°C for 3h under nitrogen atmosphere. After the reaction is finished, the obtained product is centrifuged and vacuum-dried to obtain a high-activity prepolymer. The obtained product was mixed with 8 g L The type lactide is mixed and added to the polymerization tube, filled with nitrogen and evacuated with oxygen, vacuumized, and repeated three times. Control the vacuum in the polymerization tube to be below 75 Pa, and react at 140°C for 72 hours to obtain stereocomplex polylactic acid.

[0039] (2) Dissolve the stereocomplex polylactic acid prepared in step (1) in chloroform at a concentration of 3g / 150mL. After fully dissolving, pour the solution into a quartz vessel, pour and volatilize to form a film.

[0040](3) Prepare 0.1mol / L Tris solution and 0.1mol / L HCl solution with a concentration of 0.15mol / ...

Embodiment 3

[0043] (1) Weigh the number average molecular weight to be 5.0×10 4 3 g / mol of PLLA and 3 g of PDLA were added to 100 ml of chloroform, stirred for 2 h to dissolve completely. Then the two solutions are blended and stirred, and after blending and stirring evenly, the solution is poured into a film to prepare a stereocomposite polylactic acid film material.

[0044] (2) Prepare a Tris solution with a concentration of 0.1mol / L and a 0.1mol / L HCl solution, take 500mL of a 0.1mol / L Tris solution, add a 0.1mol / L HCl solution, and set the volume to 1L to form a pH value of 9.0 buffer solution. Then, 2.0 mg of proteinase K and 2.0 mg of sodium azide were dissolved in 10 mL of buffer solution to prepare a proteinase K solution.

[0045] (3) Put the film prepared in step (1) into the proteinase K solution, degrade it in an oven at 37°C, take a sample after 72 hours, and dry it to obtain a stereocomposite polylactic acid porous film material. The obtained samples are as Figure 4 sh...

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Abstract

The invention belongs to the technical field of polymeric materials and particularly relates to a preparation method of a stereocomplex polylactic acid porous membrane material. Stereocomplex polylactic acid membrane materials with different thickness (stereocomplex polylactic acid is prepared by blending or copolymerizing poly-L-lactic acid and poly-D-lactic acid) are prepared by using solution casting film-forming method; prepared stereocomplex polylactic acid membrane samples are added to a degrading liquid and are degraded in a thermostatic oven, sapling is carried out in different time, and the porous-structure stereocomplex polylactic acid membrane material is prepared. The porous membrane material prepared herein has uniform pore size distribution, has good heat resistance and biodegradability, is widely applicable to biomolecular separation, fuel molecule adsorption, battery diaphragm materials and the like, and has a promising application prospect.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a preparation method of a stereocomposite polylactic acid porous membrane material. Background technique [0002] Porous material is a material with a network structure composed of interpenetrating or closed pore structures, and the boundaries or surfaces of the pores are composed of pillars or plates. Due to its adjustable structure, regular pore size, and large porous specific surface area, it has great application potential in biomolecular separation, catalysis, battery separator materials, and biomedical materials. [0003] For porous polymer materials, traditional preparation methods mainly include controlled foaming, particle etching, molecular imprinting, and block copolymer self-assembly etching. However, the preparation process of the above method is complicated, a large amount of organic solvent is used in the preparation process, and the obtained...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08J9/00C08G63/08C08L67/04
CPCC08G63/08C08J5/18C08J9/00C08J2367/04C08L67/04C08L2201/06C08L2203/16C08L2205/025
Inventor 范仲勇吴小蒙李远翔李伟陈萧宇
Owner FUDAN UNIV
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