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Amphiphilic polymer brush carbon nanotube/PVDF (polyvinylidene fluoride) nanofiltration membrane and preparation method thereof

A technology of amphiphilic polymers and carbon nanotubes, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of poor strength and pressure resistance that limit wide-ranging applications, and achieve the effect of improving performance

Active Publication Date: 2017-08-18
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyvinylidene fluoride (PVDF) has the advantages of very stable chemical properties, strong radiation resistance, and high thermal stability due to its unique structure. It is an ideal membrane substrate for nanofiltration membranes, but currently on the market , the nanofiltration membrane prepared with PVDF as the membrane substrate, its poor strength and pressure resistance limit its wide range of application

Method used

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  • Amphiphilic polymer brush carbon nanotube/PVDF (polyvinylidene fluoride) nanofiltration membrane and preparation method thereof
  • Amphiphilic polymer brush carbon nanotube/PVDF (polyvinylidene fluoride) nanofiltration membrane and preparation method thereof
  • Amphiphilic polymer brush carbon nanotube/PVDF (polyvinylidene fluoride) nanofiltration membrane and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0042] The main preparation process of the amphiphilic polymer brushed carbon nanotubes described in the patent of the present invention is as follows:

[0043] (1) Azide treatment on the surface of carbon nanotubes: 0.2gNaN 3 Mechanically stir with 20ml of acetonitrile at 0°C until the solution is milky white, slowly add 0.1g ICl dropwise, react at 0°C for 20min, filter to obtain IN 3 solution. Take 50mg of single-armed carbon nanotubes and disperse them in 20ml of IN 3 After the solution was stirred at room temperature for 30 minutes, it was filtered through a PTFE microporous membrane with a diameter of 0.45 um, the obtained solid was washed several times with deionized water and methanol, and the obtained solid product was vacuum-dried to obtain azide single-armed carbon nanotubes.

[0044] (2) Preparation of amphiphilic polymer:

[0045] (a) 20mmol of dodecanethiol, 10ml of acetone, and 0.8mmol of tetrabutylammonium bromide were mechanically stirred evenly under nitrog...

Embodiment 2

[0053] The main preparation process of the amphiphilic polymer brushed carbon nanotubes described in the patent of the present invention is as follows:

[0054] (1) Azide treatment on the surface of carbon nanotubes: 0.4gNaN 3 Mechanically stir with 30ml of acetonitrile at 0°C until the solution is milky white, slowly add 0.2g ICl dropwise, react at 0°C for 30min, filter to obtain IN 3 solution. Take 80mg of single-armed carbon nanotubes and disperse them in 30ml of IN 3 After the solution was stirred at room temperature for 50 minutes, it was filtered through a PTFE microporous membrane with a diameter of 0.5 um, the obtained solid was washed several times with deionized water and methanol, and the obtained solid product was vacuum-dried to obtain azide single-armed carbon nanotubes.

[0055] (2) Preparation of amphiphilic polymer:

[0056] (a) 40mmol of dodecanethiol, 20ml of acetone, and 1.0mmol of tetrabutylammonium bromide were mechanically stirred evenly under nitroge...

Embodiment 3

[0064] (1) Azide treatment on the surface of carbon nanotubes: 0.3gNaN 3 Mechanically stir with 30ml of acetonitrile at 0°C until the solution is milky white, slowly add 0.15g of ICl dropwise, react at 0°C for 25min, filter to obtain IN 3 solution. Take 80mg of single-armed carbon nanotubes and disperse them in 25ml of IN 3After the solution was stirred at room temperature for 4 minutes, it was filtered through a PTFE microporous membrane with a diameter of 0.5 um, the obtained solid was washed several times with deionized water and methanol, and the obtained solid product was vacuum-dried to obtain azide single-armed carbon nanotubes.

[0065] (2) Preparation of amphiphilic polymer:

[0066] (a) 30mmol of dodecanethiol, 15ml of acetone, and 0.9mmol of tetrabutylammonium bromide were mechanically stirred evenly under nitrogen. Slowly add 1.80 g (mass fraction 60 wt %) of NaOH solution dropwise, and continue stirring for 18 min. Slowly add a mixed solution of 30mlCS2 and 4m...

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Abstract

The invention belongs to the field of preparation of nanofiltration membranes, and particularly relates to a click-chemistry-synthesized amphiphilic polymer brush carbon nanotube / PVDF (polyvinylidene fluoride) nanofiltration membrane and a preparation method thereof. The method comprises the following steps: synthesizing a novel macromolecule initiator capable of performing click chemistry reaction and initiating azido reaction, grafting the clickable macromolecule initiator onto the surface of the single-wall carbon nanotubes by click chemistry reaction, selecting an appropriate hydrophilic modifier monomer, and preparing amphiphilic polymer brush carbon nanotubes; carrying out blending, extrusion and casting on the click-chemistry-synthesized amphiphilic polymer brush carbon nanotubes and PVDF according to a certain proportion, wherein a biaxial orientation technique is adjusted to control the biaxial orientation temperature and speed and adjust the pore size of the microporous membrane; and compounding and coating a nano-pore-size ultrathin thin layer on the obtained microporous membrane, thereby obtaining the amphiphilic polymer brush carbon nanotube / PVDF nanofiltration membrane.

Description

technical field [0001] The patent of the invention belongs to the field of nanofiltration membrane preparation, and in particular relates to the preparation and method of click chemical synthesis of amphiphilic polymer-brushed carbon nanotube / PVDF nanofiltration membrane. Background technique [0002] In the 1960s, membrane separation technology developed rapidly as a new separation technology. Its high efficiency, energy saving, environmental protection and other advantages make it widely used in food, biology and other fields. According to its molecular weight cut off, it can be divided into reverse osmosis membrane, nanofiltration membrane, ultrafiltration membrane, microfiltration membrane and so on. Among them, the nanofiltration membrane is a separation membrane with a nano-scale charged pore structure, the pore size is about 1-3nm, the molecular weight cut-off is 200-1000, the unique advantages of low operating pressure, high water outlet efficiency, and less concentr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D61/02B01D69/02B01D69/12B01D71/34C08F20/22C02F1/44
CPCB01D61/027B01D67/0079B01D69/02B01D69/12B01D71/021B01D71/34B01D2325/36C02F1/442C08F20/22
Inventor 马文中潘霁李玉雪赵宇辰夏艳平龚方红刘春林陶国良
Owner CHANGZHOU UNIV
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