Porous film material with shape memory function, and preparation method and application thereof
A porous film, memory technology, applied in chemical instruments and methods, membrane, membrane technology, etc., can solve the problem of difficult selective separation of components with different shapes, and achieve the effect of a wide range of applications
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[0034] A method for preparing a porous film material with a shape memory function provided by an embodiment of the present invention includes: adjusting the micropore shape of the porous film material formed by the film-forming substrate; wherein, the process of regulating the micropore shape includes: The film material is stretched, and then quenched; the temperature of the stretching process is above the glass transition temperature of the porous film material;
[0035] The inventor creatively used this control method for the control of the micropore shape, so that the micropore shape of the porous film material can meet different process requirements. For example, in the field of biological separation membranes, the micropore shape can be adjusted to different sizes to meet separation needs. Before stretching, the size of the porous film material and the shape of the pores are measured, and then the stretching degree is adjusted according to the target size to obtain the ta...
Embodiment 1
[0051] This embodiment provides a method for preparing a porous film material with shape memory function, which includes the following steps:
[0052] In parts by weight, 100 parts of polyvinyl chloride, 0.5 part of rare earth stabilizer and 5 parts of dioctyl adipate were dissolved in tetrahydrofuran to prepare a solution with a certain concentration (wherein, the concentration of polyvinyl chloride was about 0.01 g / mL), and then coated into a 10 μm thick film, placed in a high and low temperature alternating humid heat environment simulation box at a temperature of 15°C for 3 hours, and the relative air humidity was controlled at about 50%. The prepared film was soaked in deionized water for 3 hours, and finally dried in an oven at 80° C. to obtain a porous film material.
Embodiment 2
[0054] This embodiment provides a method for preparing a porous film material with shape memory function, which includes the following steps:
[0055] In parts by weight, 100 parts of polyvinyl chloride, 2 parts of calcium-zinc stabilizers and 50 parts of diethylhexyl phthalate were dissolved in tetrahydrofuran to prepare a solution of a certain concentration (wherein, polyvinyl chloride The concentration is about 0.5g / mL), and then coated into a 200μm thick film, and placed in a high and low temperature alternating humid heat environment simulation box at a temperature of 25°C for 7 hours, and the relative air humidity is controlled at about 90%. The prepared film was soaked in deionized water for 7 hours, and finally dried in an oven at 100° C. to obtain a porous film material.
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