Porous film material with shape memory function, its preparation method and application
A porous film and memory technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve problems such as selective separation of difficult components of different shapes, and achieve a wide range of applications
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[0034] A method for preparing a porous thin film material with shape memory function provided by an embodiment of the present invention includes: regulating and controlling the shape of the pores of the porous thin film material formed by the film-forming substrate; wherein, the regulating process of the shape of the pores 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 uses this control method for the control of the shape of the pores, so that the shape of the pores of the porous film material can meet different process requirements. meet separation needs. Measurements of the size of the porous film material and the shape of the micropores were performed before stretching, and then the degree of stretching was adjusted according to the target size to obtain the target size.
[0036] It should be noted that in order to e...
Embodiment 1
[0051] The present embodiment provides a method for preparing a porous film material with a shape memory function, which includes the following steps:
[0052] In parts by weight, weigh 100 parts of polyvinyl chloride, 0.5 parts of rare earth stabilizer and 5 parts of dioctyl adipate and dissolve them in tetrahydrofuran to prepare a solution of a certain concentration (wherein, the concentration of polyvinyl chloride is 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 h, 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] The present embodiment provides a method for preparing a porous film material with a shape memory function, which includes the following steps:
[0055] In parts by weight, weigh 100 parts of polyvinyl chloride, 2 parts of calcium zinc stabilizers and 50 parts of diethylhexyl phthalate and dissolve them in tetrahydrofuran to prepare a solution of a certain concentration (wherein, the polyvinyl chloride The concentration is about 0.5g / mL), and then coated into a 200μm thick film, placed in a high and low temperature alternating humid heat environment simulation box at a temperature of 25°C for 7h, and the relative air humidity is controlled at about 90%. The prepared film was soaked in deionized water for 7 h, and finally dried in an oven at 100 °C to obtain a porous film material.
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