A carbon dioxide responsive polyvinylidene fluoride blend membrane and preparation method thereof

A carbon dioxide and responsive technology, applied in chemical instruments and methods, separation methods, membrane technology, etc., can solve problems such as low separation efficiency and single function

Active Publication Date: 2019-09-24
TAIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

PVDF membrane has been widely used in chemical industry, electronics, textile and other industrial fields. However, PVDF membrane has problems such as single function and low separation efficiency, so it needs to be further modified and functionalized.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Preparation of polymer microspheres: ethylene glycol dimethacrylate (EGDMA) (2.0g), methacrylic acid (MAA) (8.0g), azobisisobutyronitrile (AIBN) (0.2g) and acetonitrile (400mL) were added to a 500mL single-necked flask, and the vertical rectification column, condenser and receiver were installed successively. The flask was put into a heating mantle, and the reaction solution boiled within 45 minutes, and the solvent was evaporated, and 200 mL of acetonitrile was controlled to be evaporated within 3 hours to stop the reaction. After the reaction solution is centrifuged, the supernatant is poured out, centrifuged and washed, repeated several times, and vacuum-dried to obtain functional polymer microspheres containing carboxyl groups.

[0019] 2. Preparation of carbon dioxide-responsive polymer microspheres: take 1.0 g of the above product and 6.5 g of histidine dihydrochloride and ultrasonically disperse them in N, N-dimethylamide (DMF), add 0.5 g of N-hydroxysuccinate...

Embodiment 2

[0023] 1, with embodiment 1.

[0024] 2. Preparation of carbon dioxide-responsive polymer microspheres: take 1.0 g of the above product and 5.5 g of guanidine sulfamate and ultrasonically disperse them in N, N-dimethylamide (DMF), add 0.5 g of N-hydroxysuccinyl Amine (NHS) and 0.5g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC), passed through nitrogen to exclude oxygen, reacted at room temperature for 24h, and stopped the reaction. After the reaction solution was centrifuged, the supernatant was poured out, centrifuged and washed several times, and vacuum-dried for 24 hours to obtain carbon dioxide-responsive polymer microspheres.

[0025] 3, with embodiment 1.

[0026] 4, with embodiment 1.

Embodiment 3

[0028] 1. Preparation of polymer microspheres: ethylene glycol dimethacrylate (EGDMA) (2.0g), acrylic acid (AA) (8.0g), azobisisobutyronitrile (AIBN) (0.2g) and acetonitrile (400mL) were added to a 500mL single-necked flask, and the vertical rectification column, condenser and receiver were installed successively. The flask was put into a heating mantle, and the reaction solution boiled within 45 minutes, and the solvent was evaporated, and 200 mL of acetonitrile was controlled to be evaporated within 3 hours to stop the reaction. After the reaction solution is centrifuged, the supernatant is poured out, centrifuged and washed, repeated several times, and vacuum-dried to obtain functional polymer microspheres containing carboxyl groups.

[0029] 2, with embodiment 1.

[0030] 3, with embodiment 1.

[0031] 4, with embodiment 1.

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Abstract

The invention relates to a method for preparing a CO2 responsive polyvinylidene fluoride blended membrane. The CO2 responsive polyvinylidene fluoride blended membrane comprises, by mass percentage, 0-15% of responsive polymer and 85-100% of polyvinylidene fluoride (PVDF) polymer. The method comprises a step a) of preparing nano particles: preparing the nano particles containing carboxy groups by distillation-precipitation polymerization; a step b) of performing acylation reaction to cause guanyl or guanidyl functional molecules to be grafted to the nano particles; a step c) of preparing cast film liquid: dispersing the nano particles obtained through the step b) into an organic solvent, adding PVDF, and performing dissolution and degassing to obtain the cast film liquid; a step d) of preparing a CO2 responsive blended membrane: causing the cast film liquid obtained through the step c) to form a liquid membrane on a glass plate, and forming the membrane by coagulation bath and curing. The CO2 responsive PVDF blended membrane has a pore diameter of 50-300 nm; by changing CO2 / N2 atmosphere of the membrane, membrane pore dimensions vary, and the CO2 responsive polyvinylidene fluoride blended membrane is applied to CO2 gas detection and adsorption as well as selective separation.

Description

technical field [0001] The invention belongs to the field of polymer science and technology, and relates to a carbon dioxide-responsive polyvinylidene fluoride blend film and a preparation method thereof. Vinylidene fluoride (PVDF) is blended, and the phase inversion method is used to form a film, so that the film pores can pass through the external carbon dioxide / N 2 Polymer blend membranes for gas atmosphere regulation. Background technique [0002] Polyvinylidene fluoride (PVDF) has attracted widespread attention as a separation membrane material due to its good thermal, chemical stability and mechanical strength. PVDF membranes have been widely used in chemical, electronics, textile and other industrial fields. However, PVDF membranes currently have problems such as single function and low separation efficiency, so they need to be further modified and functionalized. [0003] Stimulus-responsive polymers, also known as intelligent responsive materials, refer to polymer...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B01D71/34B01D67/00B01D69/02B01D53/22
CPCB01D53/228B01D67/0011B01D67/0013B01D69/02B01D71/34Y02C20/40
Inventor武承林韩得满何志才应安国
OwnerTAIZHOU UNIV