Method for self assembling non-spherical polystyrene grains to form into multihole and ordered structure

Abstract

The invention discloses a method for self assembling non-spherical polystyrene grains to form into a multihole and ordered structure, which comprises the following steps of: firstly preparing a core shell type solid crosslinked polystyrene microballoon with single dispersed cross linking degree which is more than 10%; putting the microballoon into organic solvent I with the parameter of solubility which is 8.0-9.5 to remove cores which are not be cross linked in a dissolving way; obtaining a hollow crosslinked polystyrene microballoon by means of solid-liquid separation; and dispersing the hollow crosslinked polystyrene microballoon in an organic solvent II which has the density ratio which is smaller than the organic solvent I and the boiling point which is smaller than 80 DEG C, and can plastify the polystyrene to form into suspending liquid, and dropping the suspending liquid on a substrate to dry at the constant temperature of 24-50 DEG C for 5-10h. The method solves the problem of the directed orientation of non-spherical grains in the current product, can complete the transformation from the hollow crosslinked polystyrene microballoon to the non-spherical grains, the self assembly of the grains and the directed orientation of the grains for once, can control the shapes of the grains according to the self-assembly temperature, and is a simple and effective method for preparing the multihole and ordered structure.

Description

technical field

[0001] The invention belongs to the technical field of self-assembly of non-spherical polymer particles and the preparation of porous ordered structures, and in particular relates to a method for self-assembling non-spherical polystyrene particles to form porous ordered structures. Background technique

[0002] Porous materials have attracted much attention for their wide applications in photonic crystals, catalysts, separation media, chemical sensors, and reaction-resistant coatings. In addition, porous membranes play an important role in providing reaction sites for the synthesis of nanomaterials, serving as cell culture media, and assisting in the construction of organic-inorganic ordered microstructures.

[0003] The preparation of porous polymer materials mainly includes template method and non-template conversion method. The template method usually uses the colloidal crystal formed by the self-assembly of monodisperse colloidal particles as a template ...

Examples

Embodiment 1

[0025] The soap-free emulsion polymerization for the preparation of monodisperse core-shell solid crosslinked polystyrene (PS) microspheres was carried out in a 250 mL four-necked flask with a stirrer and a condenser tube: first, styrene (St) was added to the flask 2. A mixture of 70g and 90mL of deionized water, start stirring (200rpm), blow nitrogen to remove oxygen for 30min; then, turn on condensed water, turn on the water bath and raise the temperature to 70°C, add 0.12g of initiator potassium persulfate (KPS) and 10mL of deionized The mixed solution of water is recorded as the beginning of soap-free emulsion polymerization at this time. After the polymerization reaction is carried out for 3 hours, divinylbenzene (DVB) is added successively using a micro-injector (1 minute, 20 μL each time, and the final balance Less than 20 μL is also added at the last time), the total amount of DVB is used to control the cross-linking degree of polystyrene microspheres to be 10% to 11%, ...

Embodiment 2

[0029] The preparation of monodisperse core-shell solid cross-linked polystyrene microspheres is the same as in Example 1.

[0030] Put 0.3g of monodisperse cross-linked core-shell solid polystyrene microsphere powder sample and 36mL of chloroform into a 100mL three-necked flask, turn on the condensed water, and dissolve at a constant temperature of 42°C for 6h under constant stirring (200rpm); then, Collect the product, add acetone, repeat ultrasonic dispersion, centrifuge (rotating speed 9000rpm, time 8min) and wash 3 to 4 times; finally, the washed product part is directly dispersed in acetone to form a hollow cross-linked polymer with a concentration of 0.01g / ml. Styrene microspheres / acetone suspension.

[0031] Drop the hollow cross-linked polystyrene microspheres / acetone suspension on the glass with a drop volume of 0.015-0.020ml in an oven environment at 30°C, and dry at a constant temperature for 8 hours to obtain quasi-hexagonal bowl-shaped hollow cross-linked polysty...

Embodiment 3

[0033] The preparation of monodisperse core-shell solid cross-linked polystyrene microspheres is the same as in Example 1.

[0034] Put 0.3g of monodisperse cross-linked core-shell solid polystyrene microsphere powder sample and 33mL tetrahydrofuran into a 100mL three-necked flask, turn on the condensed water, and dissolve at a constant temperature of 38°C for 12h under constant stirring (180rpm); then, Collect the product, add acetone, repeat ultrasonic dispersion, centrifuge (8000rpm, time 10min) and wash 3 to 4 times; finally, the washed product part is directly dispersed in acetone to form a hollow cross-linked polymer with a concentration of 0.008g / ml. Styrene microspheres / acetone suspension.

[0035]Drop the hollow cross-linked polystyrene microsphere / acetone suspension on the mica with a drop volume of 0.015-0.020ml in an oven environment at 50°C, and dry at a constant temperature for 5 hours to obtain hexagonal bowl-shaped cross-linked polystyrene microsphere particles...

technical field

[0001] The invention belongs to the technical field of self-assembly of non-spherical polymer particles and the preparation of porous ordered structures, and in particular relates to a method for self-assembling non-spherical polystyrene particles to form porous ordered structures. Background technique

[0002] Porous materials have attracted much attention for their wide applications in photonic crystals, catalysts, separation media, chemical sensors, and reaction-resistant coatings. In addition, porous membranes play an important role in providing reaction sites for the synthesis of nanomaterials, serving as cell culture media, and assisting in the construction of organic-inorganic ordered microstructures.

[0003] The preparation of porous polymer materials mainly includes template method and non-template conversion method. The template method usually uses the colloidal crystal formed by the self-assembly of monodisperse colloidal particles as a template ...

Examples

Embodiment 1

[0025] The soap-free emulsion polymerization for the preparation of monodisperse core-shell solid crosslinked polystyrene (PS) microspheres was carried out in a 250 mL four-necked flask with a stirrer and a condenser tube: first, styrene (St) was added to the flask 2. A mixture of 70g and 90mL of deionized water, start stirring (200rpm), blow nitrogen to remove oxygen for 30min; then, turn on condensed water, turn on the water bath and raise the temperature to 70°C, add 0.12g of initiator potassium persulfate (KPS) and 10mL of deionized The mixed solution of water is recorded as the beginning of soap-free emulsion polymerization at this time. After the polymerization reaction is carried out for 3 hours, divinylbenzene (DVB) is added successively using a micro-injector (1 minute, 20 μL each time, and the final balance Less than 20 μL is also added at the last time), the total amount of DVB is used to control the cross-linking degree of polystyrene microspheres to be 10% to 11%, ...

Embodiment 2

[0029] The preparation of monodisperse core-shell solid cross-linked polystyrene microspheres is the same as in Example 1.

[0030] Put 0.3g of monodisperse cross-linked core-shell solid polystyrene microsphere powder sample and 36mL of chloroform into a 100mL three-necked flask, turn on the condensed water, and dissolve at a constant temperature of 42°C for 6h under constant stirring (200rpm); then, Collect the product, add acetone, repeat ultrasonic dispersion, centrifuge (rotating speed 9000rpm, time 8min) and wash 3 to 4 times; finally, the washed product part is directly dispersed in acetone to form a hollow cross-linked polymer with a concentration of 0.01g / ml. Styrene microspheres / acetone suspension.

[0031] Drop the hollow cross-linked polystyrene microspheres / acetone suspension on the glass with a drop volume of 0.015-0.020ml in an oven environment at 30°C, and dry at a constant temperature for 8 hours to obtain quasi-hexagonal bowl-shaped hollow cross-linked polysty...

Embodiment 3

[0033] The preparation of monodisperse core-shell solid cross-linked polystyrene microspheres is the same as in Example 1.

[0034] Put 0.3g of monodisperse cross-linked core-shell solid polystyrene microsphere powder sample and 33mL tetrahydrofuran into a 100mL three-necked flask, turn on the condensed water, and dissolve at a constant temperature of 38°C for 12h under constant stirring (180rpm); then, Collect the product, add acetone, repeat ultrasonic dispersion, centrifuge (8000rpm, time 10min) and wash 3 to 4 times; finally, the washed product part is directly dispersed in acetone to form a hollow cross-linked polymer with a concentration of 0.008g / ml. Styrene microspheres / acetone suspension.

[0035]Drop the hollow cross-linked polystyrene microsphere / acetone suspension on the mica with a drop volume of 0.015-0.020ml in an oven environment at 50°C, and dry at a constant temperature for 5 hours to obtain hexagonal bowl-shaped cross-linked polystyrene microsphere particles...

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