A nanogel-based smart switch membrane and its preparation method

A nano-gel and smart switch technology, applied in the field of separation membrane, can solve the problems of poor response switching coefficient, etc., and achieve the effect of improving the response switching coefficient, excellent cycle response stability, excellent temperature and pH response switching coefficient

Active Publication Date: 2021-06-04
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the response component of the membrane is a grafted brush-like polymer long chain, and the response switch coefficient of the membrane is poor, wherein the temperature response gate switch coefficient is less than 1.5 between 30 and 60 °C, and the pH response gate switch coefficient is at pH = Less than 1.5 between 4 and pH=7, see [Y.M.Lee, J.K.Shim, Polymer1997, 38, 1227.]

Method used

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  • A nanogel-based smart switch membrane and its preparation method
  • A nanogel-based smart switch membrane and its preparation method
  • A nanogel-based smart switch membrane and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0046] In this example, the preparation method of nanogel / polyethersulfone membrane with temperature and pH stimulus response is as follows:

[0047] (1) Synthesis of P(NIPAM-co-MAA) nanogels with temperature- and pH-responsive behavior: NIPAM monomer, MAA monomer, MBA crosslinker, APS initiator, and SDS surfactant were added to deionized water , under the protection of nitrogen, react at 70°C for 3 hours to obtain P(NIPAM-co-MAA) nanogel suspension.

[0048] The concentration of the reactant total monomer (NIPAM and MAA) is 0.07mol L -1 , the feed molar ratio of MAA to NIPAM is 2:8; the feed molar ratio of MBA and APS to the total monomer (NIPAM and MAA) is 5% and 2%, and the concentration of SDS in water is 0.104mmol L -1 .

[0049] (2) the nanogel suspension of step (1) is thoroughly purified with the centrifugation of 8000-10000r / min gained nanogel, then repeats to be dispersed in water 5 times to at least remove residual unreacted component; The purified nanogel was fr...

Embodiment 2

[0058] In this embodiment, the process steps of the preparation method of nanogel / polyethersulfone membrane with temperature and pH stimulus response are the same as in Example 1, the difference is only in the feed molar ratio of MAA and NIPAM in step (1) The ratio is 1:9, the resulting nanogel is labeled as Nanogel No.1, and the resulting membrane is labeled as Membrane M0.1.

Embodiment 3

[0060] In this embodiment, the process steps of the preparation method of nanogel / polyethersulfone membrane with temperature and pH stimulus response are the same as in Example 1, the difference is only in the feed molar ratio of MAA and NIPAM in step (1) The ratio is 3:7, the resulting nanogel is labeled as Nanogel N0.3, and the resulting membrane is labeled as Membrane M0.3.

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Abstract

The invention provides a method for preparing a nanogel / polyethersulfone stimuli-responsive membrane, the steps are as follows: (1) prepare a nanogel with temperature and pH response by free radical polymerization; (2) prepare the nanogel Add glue and polyethylene glycol to N-methylpyrrolidone and mix evenly, ultrasonically disperse, then add polyethersulfone, mix evenly to form a casting solution, and then degas the casting solution; (3) Then use a doctor knife Make the film casting solution into a continuous and uniform liquid film on a glass plate, and quickly put the liquid film into water containing 30% acetic acid volume fraction to soak until the liquid film is completely solidified, and continue to soak the film in pure water to remove impurities , to obtain a smart switch membrane with temperature and pH response. The method is assisted by acetic acid, and the nanogel / polyethersulfone smart membrane prepared has excellent temperature and pH response gate switching coefficient and reversible stimulus response performance, low raw material price, simple membrane making process, and easy to realize industrial production and large-scale applications.

Description

technical field [0001] The invention belongs to the technical field of separation membranes, and in particular relates to a temperature- and pH-responsive intelligent switch membrane with excellent response switching coefficient and reversible cycle performance and a preparation method thereof. Background technique [0002] Membrane technology has developed rapidly in the past few decades and has been widely used in the fields of energy, chemical engineering, environmental engineering and life sciences. However, the pore size and pore surface properties of traditional membranes are usually unchangeable once produced. These membranes with fixed pore size and fixed selectivity severely restrict their effective utilization. Therefore, the development of smart membranes with self-adjustable pore sizes has gradually attracted the interest of the scientific and engineering communities. Smart membranes with environmental stimulus responses have great potential applications in che...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/02B01D67/00B01D71/68C08F220/54C08F220/06
CPCB01D67/0002B01D69/02B01D71/68B01D2325/02C08F220/54C08F220/06
Inventor 刘华文赵雪婷张是求高从堦
Owner ZHEJIANG UNIV OF TECH
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