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Ionic liquid functionalized temperature-responsive composite film and preparation method thereof

A temperature-responsive, ionic liquid technology, applied in the field of ionic liquid-functionalized temperature-responsive composite membranes and their preparation, can solve the problems of harsh surface-initiated living radical polymerization modification methods, cumbersome adjustment methods, and single response temperature. , to achieve a good basis for industrialized production, easy batching, and obvious effects of regulation and control.

Inactive Publication Date: 2014-11-19
FUDAN UNIV
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Problems solved by technology

However, the methods in the above reports all adjust the temperature response behavior of the membrane through the control of the synthesis steps. Once the product is produced, its temperature-sensitive behavior is fixed and cannot be changed, and the modification method of surface-induced living radical polymerization is harsh. The method is cumbersome
[0005] At present, the research on temperature-sensitive materials with adjustable temperature is mainly by adjusting the synthesis process of copolymers, changing the ratio of different monomers in the synthesis stage, and obtaining a series of polymer materials with different responses to temperature. In this way, the process Complicated and cumbersome, not conducive to industrialization
And after the material is prepared, it loses its adjustability, and it is still a material with a single temperature response.

Method used

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  • Ionic liquid functionalized temperature-responsive composite film and preparation method thereof
  • Ionic liquid functionalized temperature-responsive composite film and preparation method thereof
  • Ionic liquid functionalized temperature-responsive composite film and preparation method thereof

Examples

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Effect test

Embodiment 1

[0020] In an aqueous solution containing 4.50 mg / mL vinylimidazole, 10.5 mg / mL N-isopropylacrylamide, 0.625 mg / mL azobisisobutylamidine hydrochloride, and 5.21 mg / mL bromoethane, put Brominated polyphenylene ether-based film, then placed at 70 o C temperature, constant temperature reaction for 5 hours, and then the membrane was taken out to obtain an ionic liquid functionalized temperature-responsive composite membrane.

[0021] Then, the ionic liquid functionalized temperature-responsive composite membrane was re-mixed with the reaction solution containing different concentrations of potassium hexafluorophosphate, the reaction solution of group A contained 0.022 mg / mL potassium hexafluorophosphate, and the reaction solution of group B contained 0.044 mg / mL potassium hexafluorophosphate. mL potassium hexafluorophosphate, group C reaction solution contains 0.066 mg / mL potassium hexafluorophosphate, group D reaction solution contains 0.13 mg / mL potassium hexafluorophosphate, gro...

Embodiment 2

[0029] In an aqueous solution containing 7.50 mg / mL vinylimidazole, 17.5 mg / mL N-isopropylacrylamide, 1.04 mg / mL azobisisobutylamidine hydrochloride, 8.68 mg / mL bromoethane, put Brominated polyphenylene ether-based film, then placed at 70 o C temperature, constant temperature reaction for 5 hours, and then take out the membrane to obtain an ionic liquid functionalized temperature-responsive composite membrane;

[0030] Then, the ionic liquid functionalized temperature-responsive composite membrane was re-mixed with the reaction solution containing different concentrations of potassium hexafluorophosphate, the reaction solution of group A contained 0.037 mg / mL potassium hexafluorophosphate, and the reaction solution of group B contained 0.073 mg / mL potassium hexafluorophosphate. mL potassium hexafluorophosphate, group C reaction solution contains 0.11 mg / mL potassium hexafluorophosphate, group D reaction solution contains 0.15 mg / mL potassium hexafluorophosphate, group E reacti...

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Abstract

The invention belongs to the technical field of films, and particularly relates to an ionic liquid functionalized temperature-responsive composite film and a preparation method thereof. The method comprises the following steps: carrying out in-situ polymerization on an ionic liquid precursor monomer and a temperature-sensitive polymer monomer on a porous polymer base film surface, and meanwhile, carrying out quaternization reaction on the ionic liquid precursor unit and alkyl halide to form the ionic liquid temperature-sensitive copolymer. The obtained temperature-responsive composite film has temperature responsiveness, and especially can effectively regulate the response temperature of the composite film to the outside environment through the quantitative ion exchange between the hydrophilic counter ions and hydrophobic counter ions of the ionic liquid unit, thereby adapting to multiple application demands. The method has the advantages of simple operational process, mild preparation conditions and lower production cost, can easily implement mass large-scale production, and has favorable industrial production foundation and wide application prospects.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to an ionic liquid functionalized temperature-responsive composite membrane with adjustable response temperature and a preparation method thereof. Background technique [0002] Temperature-responsive smart membrane is a new type of functional membrane material developed based on bionic materials. Temperature-responsive smart membranes are mostly composed of a porous base membrane and a polymer functional switch that can sense changes in the external environment temperature. This type of membrane material can change the conformation of the polymer functional switch according to the temperature change in the external environment, thereby changing the effective pore size and permeability of the switch membrane. Since the temperature-responsive smart membrane combines many advantages such as the responsiveness of smart polymers and the good mechanical strength of the poro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/40C08J7/16
Inventor 唐莹汤蓓蓓武培怡
Owner FUDAN UNIV
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