Bio‐Inspired Renewable Surface‐Initiated Polymerization from Permanently Embedded Initiators

Du, Tao; Li, Bin; Wang, Xiaolong; Yu, Bo; Pei, Xiaowei; Huck, Wilhelm T. S.; Zhou, Feng

doi:10.1002/anie.201600080

Cited by 45 publications

(30 citation statements)

References 35 publications

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“…To allow modification by SI‐ATRP from the micro‐brushes, an amount of functionalized methacrylate comonomer bearing a Br‐functional living free radical initiator, BrMA are added to the AA monomer to give the copolymer. Because the initiator BrMA exists on the surface, the PAABr micro‐brushes can be modified with a wide range of polymer brushes via SI‐ATRP technique …”

Section: Resultsmentioning

confidence: 99%

Bio‐Inspired Design and Fabrication of Micro/Nano‐Brush Dual Structural Surfaces for Switchable Oil Adhesion and Antifouling

Pei

et al. 2016

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The underwater superoleophobic surfaces play a significant role in anti-oil contamination, marine antifouling, etc. Inspired by the Gecko's feet and its self-cleaning property, a hierarchical structure composed of poly (acrylic acid) gel micro-brushes is designed by the liquid-infused method. This surface exhibits underwater superoleophobicity with very low oil adhesion. It is then modified with stimuli-responsive polymer nano-brushes via surface-initiated atom transfer radical polymerization from the embedded initiator. The micro/nano-brush dual structural surfaces can switch the underwater oil adhesion between low and high while keeping the superoleophobicity. The antifouling properties against algae attachment under different mediums are also investigated to show a strong link between oleophobicity and antibiofouling property. The model surface will be very useful in directing the design of marine self-cleaning coatings to both living and non-living species.

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Section: Resultsmentioning

confidence: 99%

Bio‐Inspired Design and Fabrication of Micro/Nano‐Brush Dual Structural Surfaces for Switchable Oil Adhesion and Antifouling

Pei

et al. 2016

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“…[ 10 ] Nevertheless, in macroscale test level such as for in vivo applications, nanothin polymer brushes are liable to be torn even under small loading because of the existing roughness of the sliding pair. [ 15 ] This is already the case of a smooth hard artificial joint grafted with zwitterionic polymer brushes, which hardly showed an ultralow coefficient of friction in realistic contact conditions because of the high contact stresses (proportional to E 2/3 , where E is the Young’s modulus), which could not be avoided even with the adopted smooth surfaces. [ 14 ] Therefore, in the worst case of rough or wear‐induced roughened hard mating surfaces, which typically results in a wider (than in the Hertzian case) distribution of interface contact stresses (due to the multiscale fragmentation of the nominal contact into micro‐ to nanoscale contact patches), polymer brushes alone on a rigid substrate cannot represent a good candidate to provide ultralow friction.…”

Section: Theoretical Analysis and Modelsmentioning

confidence: 99%

High Lubricity Meets Load Capacity: Cartilage Mimicking Bilayer Structure by Brushing Up Stiff Hydrogels from Subsurface

Rong

Liu

Scaraggi

et al. 2020

Adv Funct Materials

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Natural articular cartilage has ultralow friction even at high squeezing pressure. Biomimicking cartilage with soft materials has been and remains a grand challenge in the fields of materials science and engineering. Inspired by the unique structural features of the articular cartilage, as well as by its remarkable lubrication mechanisms dictated by the properties of the superficial layers, a novel archetype of cartilage-mimicking bilayer material by robustly entangling thick hydrophilic polyelectrolyte brushes into the subsurface of a stiff hydrogel substrate is developed. The topmost soft polymer layer provides effective aqueous lubrication, whereas the stiffer hydrogel layer used as a substrate delivers the load-bearing capacity. Their synergy is capable of attaining low friction coefficients (order 0.010) under heavily loaded conditions (order 10 MPa contact pressure) in water environment, a performance incredibly close to that of natural articular cartilage. The bioinspired material can maintain low friction even when subjected to 50k reciprocating cycles under high contact pressure, with almost no wear observed on the sliding track. These findings are theoretically explained and compounded by multiscale simulations used to shed light on the mechanisms responsible for this remarkable performance. This work opens innovative technology routes for developing cartilage-mimicking ultralow friction soft materials.

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“…Only a few reports demonstrate the possibility of double or multi-use functional substrates. A "print, erase, and reprint" approach was reported for the rewritable polymer brushes on glass and silicon substrates based on click chemistry [25,26]. Zhou et al demonstrated the repeatable surface modification based on an initiator-embedded polystyrene sheet that did not require specific surface chemistry for the initiator immobilization [27].…”

Section: Introductionmentioning

confidence: 99%

Renewable Fabric Surface-Initiated ATRP Polymerizations: Towards Mixed Polymer Brushes

et al. 2020

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A totally new approach in the synthesis of mixed polymer brushes tethered on polyamide (PA) surfaces is presented herein. As a proof of concept, two types of homopolymers were synthesized in sequential surface-initiated atom transfer radical polymerization (SI-ATRP) reactions: poly(methyl methacrylate)/poly((2-dimethylamino)ethyl methacrylate) and polystyrene /poly((2-dimethylamino)ethyl methacrylate). The ATRP initiator was immobilized on the surface through PA chain-end groups in two subsequent steps, separated by homo-polymerizations. The amount of the PA chains’ end groups available on the modified surface was tuned by the thermal rearrangement of the surface.

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Bio‐Inspired Renewable Surface‐Initiated Polymerization from Permanently Embedded Initiators

Cited by 45 publications

References 35 publications

Bio‐Inspired Design and Fabrication of Micro/Nano‐Brush Dual Structural Surfaces for Switchable Oil Adhesion and Antifouling

Bio‐Inspired Design and Fabrication of Micro/Nano‐Brush Dual Structural Surfaces for Switchable Oil Adhesion and Antifouling

High Lubricity Meets Load Capacity: Cartilage Mimicking Bilayer Structure by Brushing Up Stiff Hydrogels from Subsurface

Renewable Fabric Surface-Initiated ATRP Polymerizations: Towards Mixed Polymer Brushes

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