Synthetic method of polystyrene block copolymer for ultramicro filter membrane

A polystyrene block and block copolymer technology, which is applied in the synthesis field of new functional polymer materials, can solve the problems of high pore density, controllable thickness of selective layer, difficulty in preparing regular pore size, etc., and achieves simple implementation steps. , Reduce the purification steps, the effect of low price

Inactive Publication Date: 2014-12-10
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a synthetic method for polystyrene block polymers for ultra-microfiltration membranes, so as to overcome the difficulties in preparing the existing polymer raw materials with regular pore size, controllable thickness of the selective layer, Technical problems with high pore density

Method used

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  • Synthetic method of polystyrene block copolymer for ultramicro filter membrane
  • Synthetic method of polystyrene block copolymer for ultramicro filter membrane
  • Synthetic method of polystyrene block copolymer for ultramicro filter membrane

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preparation example Construction

[0027] According to the present invention, a kind of synthetic method of polystyrene block copolymer for ultra-microfiltration membrane comprises the following steps:

[0028] (1) Dissolving the first monomer, initiator and chain transfer agent in solvent A to form a homogeneous solution;

[0029] Wherein, the first monomer is selected from acrylic acid, N-isopropylacrylamide, N,N-dimethylacrylamide, N,N-ethyl dimethacrylate, N-(3-dimethylaminopropyl) Acrylamide, hydroxyethyl acrylate, hydroxyethyl acrylamide, methyl acrylate, ethyl acrylate, butyl acrylate, tert-butyl acrylate, polyethylene glycol acrylate, 4-vinylpyridine, 2-vinylpyridine, Vinylimidazole.

[0030] Described initiator is selected from benzoyl peroxide, azobisisobutyrocyanide, azobiscyanovaleric acid;

[0031] The chain transfer agent is selected from trithioester compounds, and the leaving group (i.e. R group) of the trithioester compound is selected from ethyl, propyl, butyl, pentyl, hexyl, heptyl Base, O...

Embodiment 1

[0041] A kind of synthetic method of polystyrene block copolymer for ultra-microfiltration membrane, the steps are as follows:

[0042](1) Dissolve acrylic acid, azobisisobutylcyanide, and S-dodecyl-S'-(dimethylacetic acid)-trithioester in 3000 ml of dimethylformamide to form a homogeneous solution, in which The molar concentrations of acrylic acid, azobisisobutylcyanide, and S-dodecyl-S'-(dimethylacetic acid)-trithioester were 3 mol / L, 1.5×10 -3 mol / L, 1.5×10 -2 mol / L;

[0043] (2) React the above reaction under a nitrogen atmosphere for 8 hours, and the reaction temperature is 75°C;

[0044] (3) Then add 25mol styrene monomer that has been pre-deoxygenated;

[0045] (4) Keep the nitrogen atmosphere unchanged, raise the reaction temperature to 80°C and continue the reaction for 36 hours, then stop the reaction and cool to room temperature naturally;

[0046] (5) Precipitate the reaction solution to 3×10 4 ml of petroleum ether, the solid product was isolated as a two-b...

Embodiment 2

[0048] A kind of synthetic method of polystyrene block copolymer for ultra-microfiltration membrane, the steps are as follows:

[0049] (1) Dissolve acrylic acid, benzoyl peroxide, and S-dodecyl-S'-(dimethylacetic acid)-trithioester in 1000 ml of dimethylformamide to form a homogeneous solution, in which acrylic acid , benzoyl peroxide, and S-dodecyl-S'-(dimethylacetic acid)-trithioester have a molar concentration of 3 mol / L, 1.5×10 -3 mol / L, 1.5×10 -2 mol / L;

[0050] (2) React the above reaction under a nitrogen atmosphere for 8 hours, and the reaction temperature is 75°C;

[0051] (3) Then add 25 mol of pre-deoxygenated styrene and 5 mol of pre-deoxygenated butyl acrylate;

[0052] (4) Keep the nitrogen atmosphere unchanged, raise the reaction temperature to 85°C and continue the reaction for 30 h, then stop the reaction and cool to room temperature naturally;

[0053] (5) Precipitate the reaction solution into 8000ml of isopropanol, and separate the solid product as a...

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Abstract

The invention discloses a synthetic method of a polystyrene block copolymer for an ultramicro filter membrane. The method comprises the following steps: mixing a first monomer, an initiator, a chain transfer agent and a solvent A to form a homogeneous solution, polymerizing in an inert atmosphere for a certain time, adding styrene and a second monomer, continuously polymerizing for a proper time, and settling a polymer solution to obtain the polystyrene block copolymer. The prepared block copolymer has the molecular weight of 5,000-750,000g / mol and the polydispersity index of 1.05-1.55, and can be used for preparing a homopore membrane, a nanofiber membrane, a self-repair ultramicro filter membrane and a composite membrane material.

Description

technical field [0001] The invention belongs to the field of synthesis of novel functional macromolecular materials, in particular to a synthesis method of polystyrene block polymer used for ultra-microfiltration membrane materials. Background technique [0002] Polymers such as cellulose acetate, polyvinylidene fluoride, polyaryl sulfone, and polyacrylonitrile are classic chemical raw materials for preparing polymer separation membranes, and polymer separation membranes have been prepared from these polymers for 20-60 years. development path. So far, the separation membranes of the above-mentioned polymers as raw materials have played an increasingly important role in the fields of chemical industry, water treatment, and nanoparticle purification, showing the technical advantages of high efficiency, energy saving, environmental protection, and maturity of polymer membrane separation technology . However, with the advancement of separation technology, the requirements for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F293/00C08F6/12
Inventor 易砖徐又一朱利平王正宝
Owner ZHEJIANG UNIV
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