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Conformation-dominated surface antifouling and aqueous lubrication
Hanhan Wang1, Zekai Zhang1, Jiao Chen1
1Key Laboratory for Advanced Materials and School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, PR China.
Colloids and Surfaces. B, Biointerfaces
|March 24, 2022
Summary
Poly(ethylene glycol) (PEG) polymer brushes with looped conformations significantly enhance antifouling and lubrication properties for biomaterials. This surface modification strategy offers improved performance for medical implants.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Surface Science
Background:
- Antifouling and lubrication are critical for biomaterials, particularly for implants.
- Understanding polymer conformation's impact on surface properties is essential for designing advanced biomaterials.
Purpose of the Study:
- To investigate the influence of poly(ethylene glycol) (PEG) polymer brush conformation on surface antifouling and lubrication properties.
- To compare the performance of PEG in tail and loop conformations anchored to surfaces.
Main Methods:
- Synthesized diblock and triblock copolymers with poly(dopamine methacrylamide) (PDMA) anchors and PEG main bodies.
- Anchored copolymers onto silicon surfaces using a "grafting to" strategy, controlling for similar surface characteristics.
- Evaluated antifouling and friction behaviors of surfaces modified with PEG in different conformations.
Main Results:
- PEG triblock copolymer surfaces (looped conformation) demonstrated superior antifouling properties and a lower friction coefficient (∼0.011) compared to diblock copolymer surfaces (tailed conformation).
- Calculations and simulations confirmed higher adsorption energy and looped conformation for triblock copolymers.
- Strongly anchored PEG loops provide excellent antifouling and lubrication due to hydration and steric hindrance.
Conclusions:
- Polymer brush conformation significantly impacts surface antifouling and lubrication.
- Loop-configured PEG polymer brushes offer a promising approach for developing highly effective antifouling surfaces with reduced friction for biomaterial applications.
Keywords:
AntifoulingAqueous lubricationMussel-inspired chemistryPoly(ethylene glycol)Topological conformationMore Related Videos
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