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A kind of amphiphilic copolymer endowing membrane material with pH responsiveness and preparation method thereof

An amphiphilic copolymer and membrane material technology, applied in the field of amphiphilic copolymers, can solve the problems of poor compatibility between hydrophobic segments and membrane matrix, introduction of pH-responsive functional segments, and few types of compatible hydrophobic segments. , to achieve precise control of molecular weight and molecular weight distribution, easy large-scale production, and simple operation.

Active Publication Date: 2018-11-09
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] According to the existing reports, the main problem in the preparation of pH-responsive separation membranes by the blending method is that the pH-responsive additives can only be applied to a single polymer, and there are few types of compatible hydrophobic segments to choose from.
If the membrane constituent polymer (i.e. the matrix polymer) is used as the hydrophobic segment, although the compatibility is high, because the membrane material is mostly a material with relatively stable chemical properties, many reactions are difficult to carry out, and it is not easy to introduce a pH response on its molecule. functional segment; if other polymers different from the matrix polymer are used as the hydrophobic segment, although the introduction of the pH-responsive functional segment can be facilitated, the compatibility of the hydrophobic segment with the membrane matrix is ​​generally poor. Poor, and usually choose different hydrophobic segments for different membrane materials

Method used

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  • A kind of amphiphilic copolymer endowing membrane material with pH responsiveness and preparation method thereof
  • A kind of amphiphilic copolymer endowing membrane material with pH responsiveness and preparation method thereof
  • A kind of amphiphilic copolymer endowing membrane material with pH responsiveness and preparation method thereof

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preparation example Construction

[0049] In the preparation method of the present invention, the reaction temperature and time described in the step (1), step (2) and step (3) are based on the specific type of the reaction compound, the predetermined structural unit repeating numbers n and m, the predetermined two The number average molecular weight of the pro-copolymer is adjusted.

[0050] In the preparation method of the present invention, the number average molecular weight of the hydroxypropyl silicone oil described in step (1) is 3000-5000 g / mol, such as 3000, 4000 or 5000 g / mol.

[0051] For convenience of description, the material used in the examples is abbreviated as follows:

[0052] name

abbreviation

name

abbreviation

Hydroxypropyl silicone oil

HO-PDMS-OH

acrylic acid

AAA

Polydimethylsiloxane

PDMS

Methacrylate

MAA

2-Bromoisobutyryl bromide

BIBB

tert-butyl acrylate

tBA

PDMS macroinitiator

Br-PDMS-Br

tert-but...

Embodiment 1

[0064] (1) Macroinitiator Br-PDMS 54 -Br (wherein the subscript 54 is the number of dimethylsiloxane structural units in PDMS, and the subscript Arabic numerals below all indicate the number of structural units; when the subscript is not used, the number of structural units is limited in the present invention Within the range of n and m.) Synthesis. Add 30g HO-PDMS-OH (number average molecular weight 4000g / mol), 2.204mL triethylamine and 100mL THF into a 250mL three-neck flask, add 1.882mLBIBB and 20mL THF into a constant pressure funnel, and blow argon into the flask for 10min to remove Air, the liquid in the constant pressure funnel was slowly added dropwise to the three-neck flask in the ice-water bath, and the ice-water bath was removed after 1 hour, and reacted at room temperature for 16 hours. Remove ammonium salt by filtration, remove THF by rotary evaporation, then add 100mL n-hexane to dissolve, wash 3 times with 70mL deionized water in a separatory funnel, remove th...

Embodiment 2

[0068] (1) Macroinitiator Br-PDMS 54 - Preparation of Br. Method is the same as embodiment 1 step (1).

[0069] (2) Triblock copolymer PtBMA 25 -PDMS 54 -PtBMA 25 preparation. Add the macromolecular initiator Br-PDMS into the 100mL oblique two-necked flask 54 - Br 1.0g (0.25mmol), CuBr 0.072g (0.5mmol), sealed - frozen, evacuated - filled with argon 3 times. Add 13.17mL of butanone, 3.977mL (25mmol) of tert-butyl methacrylate (tBMA) and 100μL (0.5mmol) of pentamethyldiethylenetriamine (PMDETA) into a small beaker. In an open flask, stir at room temperature to completely dissolve the copper salt, then transfer to an oil bath at 60°C for 24 hours. After the reaction, use 10mL butanone to dilute the reaction solution, pass through a neutral alumina column, use butanone as the eluent to remove copper salt, and remove most of the solvent by rotary evaporation, then add the remaining solution dropwise to 200mL methanol and water (v / v 50:50), remove the solvent by filtration,...

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Abstract

The invention discloses an amphiphilic copolymer capable of endowing the pH response of a membrane material. The amphiphilic copolymer has the following structural formula as shown in the description, wherein R is methyl group or hydrogen, n is an integer between 30 and 70 and m is an integer between 15 and 60; and the amphiphilic copolymer has number-average molecular weight of 6200-22000g / mol. The invention also discloses a preparation method of the amphiphilic copolymer.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to an amphiphilic copolymer capable of imparting pH responsiveness to membrane materials, a preparation method thereof, and an application thereof in membrane material modification. technical background [0002] Stimuli-responsive separation membranes, which can spontaneously adjust their flux and separation performance depending on the surrounding environment, have received extensive attention. At present, a variety of separation membranes with environmental responsiveness have been developed, including pH, ionic strength, temperature, electric field strength, light and other responsive membranes. These environmentally responsive separation membranes have great application value in drug or chemical controlled release, bioseparation, tissue engineering, water treatment, etc. In most cases, pH is a very important parameter, so the development of pH-responsive membranes i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F293/00C08F220/18C08F8/12C08L53/00C08L27/16C08L81/06
Inventor 何春菊刘大朋王海晔轩慧霞张丽
Owner DONGHUA UNIV