Degradable aliphatic polycarbonate film and preparation method thereof

Abstract

The invention discloses a degradable aliphatic polycarbonate film and a preparation method thereof. The film has a bore diameter of 3 mu m-20 mu m, an aperture ratio of 5%-80% and a thickness of 1 mu m-100 mu m. The preparation method of the film comprises the following steps of dissolving aliphatic polycarbonate in a solvent to obtain film casting liquor; and pouring the film casting liquor on a film casting plate and spreading, and stewing and drying to constant weight in sequence to obtain a product. The degradable aliphatic polycarbonate film provided by the invention has porosity characteristic and wide application prospect in the fields of biology, medicine, chemicals, environment and the like. The preparation method of the degradable aliphatic polycarbonate film is simple in process, simple and convenient to operate, easy to realize, low in device dependency and fewer in materials.

Description

technical field

[0001] The invention relates to a degradable aliphatic polycarbonate film and a preparation method thereof. Background technique

[0002] Aliphatic polycarbonate prepared from carbon dioxide is a polymer with biodegradable properties. Since the synthetic raw material of aliphatic polycarbonate utilizes the "greenhouse gas" - carbon dioxide gas, it reduces environmental pressure and belongs to waste recycling; at the same time, aliphatic polycarbonate itself has the characteristics of biodegradation, which can solve problems The world's "white pollution" problem, therefore, has very important social benefits and environmental protection value. After decades of efforts, the synthesis and catalysis technology of aliphatic polycarbonate has been continuously improved, the synthesis cost has been continuously reduced, the modification space of the material has been increased, and the application scope of the material has been expanded.

[0003] A carbon dioxide ...

Examples

Embodiment 1

[0026] Embodiment 1, the preparation of polypropylene carbonate film

[0027] Polypropylene carbonate (Wn=200,000) was dissolved in chloroform to prepare a 10wt% film casting liquid; the film casting liquid was poured into a flat glass mold, and allowed to stand at 20°C for 8 hours to remove by volatilization Most of the solvent; and then vacuum dried to constant weight, the vacuum degree is 0.03 MPa, the drying temperature is 50° C., and the drying time is 5 hours, and the porous degradable polypropylene carbonate film is obtained.

[0028] figure 1 The scanning electron microscope image of the polypropylene carbonate film prepared above shows that the aperture is 8-18 μm, the porosity is 50%, and the thickness is 20 μm.

Embodiment 2

[0029] Embodiment 2, the preparation of polypropylene carbonate film

[0030] Polypropylene carbonate (Wn=150,000) was dissolved in tetrahydrofuran to prepare a 12wt% casting solution; pour the casting solution into a flat glass mold and let stand at 25°C for 10 hours to remove most of it by volatilization solvent; the chamber is then vacuum-dried to constant weight, the vacuum degree is 0.02 MPa, the drying temperature is 70° C., and the drying time is 6 hours to obtain a porous degradable polypropylene carbonate film.

[0031] The pore size of the polypropylene carbonate film prepared in this example is 3-8 μm, the porosity is 30%, and the thickness is 35 μm.

Embodiment 3

[0032] Embodiment 3, the preparation of polypropylene carbonate film

[0033] Polypropylene carbonate (Wn=250,000) was dissolved in ethyl formate to prepare a 10wt% casting solution; pour the casting solution into a flat glass mold, and let it stand at 25°C for 7 hours to remove by volatilization Most of the solvent; and then vacuum dried to constant weight, the vacuum degree is 0.03 MPa, the drying temperature is 60° C., and the drying time is 5 hours, and the porous degradable polypropylene carbonate film is obtained.

[0034] The pore size of the polypropylene carbonate film prepared in this example is 3-8 μm, the porosity is 60%, and the thickness is 40 μm.

technical field

[0001] The invention relates to a degradable aliphatic polycarbonate film and a preparation method thereof. Background technique

[0002] Aliphatic polycarbonate prepared from carbon dioxide is a polymer with biodegradable properties. Since the synthetic raw material of aliphatic polycarbonate utilizes the "greenhouse gas" - carbon dioxide gas, it reduces environmental pressure and belongs to waste recycling; at the same time, aliphatic polycarbonate itself has the characteristics of biodegradation, which can solve problems The world's "white pollution" problem, therefore, has very important social benefits and environmental protection value. After decades of efforts, the synthesis and catalysis technology of aliphatic polycarbonate has been continuously improved, the synthesis cost has been continuously reduced, the modification space of the material has been increased, and the application scope of the material has been expanded.

[0003] A carbon dioxide ...

Examples

Embodiment 1

[0026] Embodiment 1, the preparation of polypropylene carbonate film

[0027] Polypropylene carbonate (Wn=200,000) was dissolved in chloroform to prepare a 10wt% film casting liquid; the film casting liquid was poured into a flat glass mold, and allowed to stand at 20°C for 8 hours to remove by volatilization Most of the solvent; and then vacuum dried to constant weight, the vacuum degree is 0.03 MPa, the drying temperature is 50° C., and the drying time is 5 hours, and the porous degradable polypropylene carbonate film is obtained.

[0028] figure 1 The scanning electron microscope image of the polypropylene carbonate film prepared above shows that the aperture is 8-18 μm, the porosity is 50%, and the thickness is 20 μm.

Embodiment 2

[0029] Embodiment 2, the preparation of polypropylene carbonate film

[0030] Polypropylene carbonate (Wn=150,000) was dissolved in tetrahydrofuran to prepare a 12wt% casting solution; pour the casting solution into a flat glass mold and let stand at 25°C for 10 hours to remove most of it by volatilization solvent; the chamber is then vacuum-dried to constant weight, the vacuum degree is 0.02 MPa, the drying temperature is 70° C., and the drying time is 6 hours to obtain a porous degradable polypropylene carbonate film.

[0031] The pore size of the polypropylene carbonate film prepared in this example is 3-8 μm, the porosity is 30%, and the thickness is 35 μm.

Embodiment 3

[0032] Embodiment 3, the preparation of polypropylene carbonate film

[0033] Polypropylene carbonate (Wn=250,000) was dissolved in ethyl formate to prepare a 10wt% casting solution; pour the casting solution into a flat glass mold, and let it stand at 25°C for 7 hours to remove by volatilization Most of the solvent; and then vacuum dried to constant weight, the vacuum degree is 0.03 MPa, the drying temperature is 60° C., and the drying time is 5 hours, and the porous degradable polypropylene carbonate film is obtained.

[0034] The pore size of the polypropylene carbonate film prepared in this example is 3-8 μm, the porosity is 60%, and the thickness is 40 μm.

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