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A kind of construction method of cross-linked stable polymer brush coating
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A technology of polymer brushing and coating, which is applied in the direction of coating, separation methods, chemical instruments and methods, etc., and can solve the problems of insufficient stability of ATRP initiator coating and affecting application performance, etc.
Active Publication Date: 2021-09-17
NORTHWEST UNIV
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Problems solved by technology
[0004] Aiming at the currently reported problems of PDA and PDA-adhered ATRP initiator coatings being insufficiently stable and affecting application performance, the present invention provides a method for building stable coatings on the surface of various substrates through heating and cross-linking treatment
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Embodiment 1
[0026] Example 1 Construction of polydopamine mediation layer by dip coating method
[0027] (1) The 1000-mesh (pore size 13 μm) stainless steel mesh to be modified was ultrasonically cleaned with sodium hydroxide solution, detergent and absolute ethanol in an ultrasonic cleaner for 10 minutes, rinsed with deionized water, and washed with Blow dry with nitrogen gas. The water contact angle of the stainless steel mesh is 98±3º;
[0028] (2) Immerse in a pH=8.5, 2 mg / ml dopamine solution, and react at 25°C for 2 hours under shaking conditions;
[0029] (3) After taking it out, heat it at 120°C for 4 hours in an air atmosphere to improve the degree of polymerization and binding stability of the polydopamine-mediated layer;
[0030] (4) Soak the PDA coating with a sodium hydroxide solution with a pH of 13 for 5 minutes, and then rinse the surface and polydopamine that is not firmly combined with the mesh with distilled water. The water contact angle decreased from 98±3º before ...
Embodiment 2
[0031] Example 2 Constructing a PDA composite coating containing Si-Br and MPTS by dip coating
[0032] (1) Prepare a water:ethanol (1:1) mixed solvent solution with a dopamine concentration of 2 mg / mL and a dopamine, Si-Br, and MPTS molar ratio of 1:0.5:0.5;
[0033] (2) The stainless steel omentum obtained in Example 1 was immersed in the mixed solution of (1), reacted at 25°C under shaking conditions for 22 h, and then heated in air at 100°C for 4 h. The water contact angle was raised to 85±3º.
Embodiment 3
[0034] Example 3 Construction of PDA composite coatings containing Si-Br, MPTS and HD by dip coating
[0035] (1) Prepare a water:ethanol (1:1) mixed solvent solution with a dopamine concentration of 2 mg / mL and a molar ratio of dopamine, Si-Br, HD, and MPTS of 1:0.5:0.5:0.6;
[0036] (2) The stainless steel omentum obtained in Example 1 was immersed in the mixed solution of (1) and reacted at 25°C under shaking conditions for 22h, and then heated in air at 100°C for 4h. The water contact angle rises to 87±3º.
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Abstract
The invention discloses a method for constructing an ATRP initiator coating and a polymer brush through adhesion of polydopamine and covalent bonding of a crosslinking agent. The method can construct a cross-linked and stable ATRP initiator coating on the surface of objects of different materials and shapes such as stainless steel mesh, glass, polypropylene, etc., and then prepare a polymer brush coating in a polymerizable monomer solution in an air environment. The zwitterionic polymer brush PMPC coating prepared by the method of the invention is stable in the pH 2-12 aqueous solution, and the concentration of the sodium hydroxide solution is increased by about 100 times. After forming a cross-linked and stable PMPC polymer brush coating on the surface of the stainless steel mesh, the anti-oil pollution ability and coating stability are significantly enhanced during the separation process of oil-water mixture, and the recovery rate of filtration flux is higher.
Description
technical field [0001] The invention relates to a method for constructing a polymer brush with a stable structure on the surface of a material, belonging to the field of material surface modification. Background technique [0002] Due to the increasingly prominent environmental problems such as crude oil leakage and oily wastewater, it is urgent to find a method that can separate oil from water. Although a lot of research has been done on membrane separation technology, there are still problems such as complicated process in membrane surface modification, unsatisfactory anti-pollution performance, and significantly reduced water flux after repeated filtration. As a universal adhesive, polydopamine (PDA) has been widely used in the field of material surface modification. The PDA coating formed by the self-polymerization of dopamine can not only adhere to the surface of various materials, but also because the PDA coating contains a large amount of catechol and amino groups th...
Claims
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