Degradable aliphatic polycarbonate film and preparation method thereof
A family of polycarbonate, fat degradation technology, applied in the field of degradable aliphatic polycarbonate film and its preparation, to achieve the effect of easy realization, less material consumption and low equipment dependence
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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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