A stimuli-responsive polymer brush system is designed to switch on and off surface functionality prevent functional groups from fouling by grafting together two brushes with precisely controlled lengths. The has a fixed length, while the other extends collapses as environment changes.

ABSTRACT pH‐ and temperature‐responsive poly( N ‐isopropylacrylamide‐ block −4‐vinylbenzoic acid) (poly(NIPAAm‐ b ‐VBA)) diblock copolymer brushes on silicon wafers have been successfully prepared by combining click reaction, single‐electron transfer‐living radical polymerization (SET‐LRP), reversible addition‐fragmentation chain‐transfer (RAFT) polymerization. Azide‐terminated poly(NIPAAm) were obtained SET‐LRP followed reaction with sodium azide. A was utilized to exchange the azide end...

Abstract In this study, we report on the fabrication of tunable mixed‐charged copolymer brushes consisting negatively charged carboxylic acid monomer (4‐vinylbenzoic acid, VBA) and positively quaternary amine (( ar ‐vinylbenzyl)trimethylammonium chloride) via reversible addition–fragmentation chain transfer‐mediated polymerization. The have negative charge under neutral basic conditions, are acidic conditions owing to protonation carboxylate groups. revealed a unique wetting behavior with...

The control of molecular interactions between host and guest is considerable importance for adsorption release applications. To address this challenge, polymeric ionic liquid (PIL) brushes were prepared via reversible addition–fragmentation chain transfer polymerization, where we demonstrate that PILs confer a resistance to fouling the material based on counterion tunability PILs. anion-exchange poly(1-vinyl-3-buthylimidazolium bromide) was used host–guest interactions. Measurement film...

An unexpected nucleophilic aromatic substitution lead to a novel benzothiadiazole scaffold that bore the functional group pattern associated with benzyl-type photocleavable protecting groups. The new molecules display efficient photochemical release of leaving groups blue light. performance both ortho- and meta-substituted derivatives was probed through structural manipulation computational metrics improve performance.

Surface-grafted poly(ionic liquid) (PIL) films were prepared by both in and ex situ cross-linking methods with reversible addition-fragmentation chain transfer (RAFT) polymerization. Cross-linked brushes are more stable than linear without sacrificing the surface functionality and, therefore, have increased potential for applications biomedicine materials chemistry. The two methods, via a bifunctional cross-linker thermal cross-linking, systematically compared on silicon-wafer substrates....

Abstract Polycaprolactone (PCL) nanofibers incorporating azo dye/γ‐cyclodextrin inclusion complex (Azo/γ‐CD‐IC) were successfully produced. The characteristics of the Azo/γ‐CD‐IC and PCL/Azo/γ‐CD‐IC investigated by X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) thermogravimetric analysis (TGA). Based on SEM prepared nanofiber has a smooth surface with size diameter below 500 nm. Meanwhile, thermal stability Azo was further improved after being embedded into...

Abstract Surface contamination is a major concern in the design, fabrication, and application of biomaterials. In this work, series new adenine derivatives were synthesized three‐step method with goal protecting functional materials against microbial adhesion. Initially, 9‐(chloroalkyl)‐9H‐purin‐6‐amine compounds from adenine. Then, these reacted potassium thiocyanate or selenocyanate. last step, incorporating tetrazole ring via cycloaddition sodium azide thiocyano selenocyano derivatives....

Microbial contamination is a significant issue in various areas, especially the food industry. In this study, to overcome microbial contamination, cross-linked polymer brushes containing N-halamine were synthesized, characterized, and investigated for antibacterial properties. The with different ratios synthesized by in-situ cross-linking methods reversible addition−fragmentation chain transfer (RAFT) polymerization using bifunctional cross-linker. RAFT agent was immobilized on an...

<p>A strategy to control the efficiency of a photocleavage reaction based on changing nature excited state is presented. A novel class photoactive compounds has been synthesized by combining classical o-nitrobenzyl scaffold with an environmentally sensitive dye, 4-amino-nitrobenzothiazole. Irradiation in polar solvent lead that inoperative for photochemistry whereas excitation nonpolar photochemically active. photochemical degradation appears be preferred process contrast intended...

A strategy to control the efficiency of a photocleavage reaction based on changing nature excited state is presented. novel class photoactive compounds has been synthesized by combining classical o-nitrobenzyl scaffold with an environmentally sensitive dye, 4-amino-nitrobenzothiazole. Irradiation in polar solvent lead that inoperative for photochemistry whereas excitation nonpolar photochemically active. photochemical degradation appears be preferred process contrast intended process.

Abstract A new design strategy to control the efficiency of a photocleavage reaction based on changing nature excited state is presented. novel class photoactive compounds has been synthesized by combining classical o ‐nitrobenzyl scaffold with an environmentally sensitive dye, 4‐amino‐nitrobenzothiazole. Irradiation in polar solvent led that was inoperative for photochemistry whereas excitation nonpolar photochemically active. While our hypothesis tests true on/off photochemical process,...

Polymer brushes and brush gels were prepared by RAFT polymerization. Prepared surfaces characterized XPS, AFM, ellipsometry, water contact angle measurements. The swelling properties stability of compared. It was determined that the ratio decreased with increasing grafting density cross-linker for polymer gels, respectively. As a result, it observed cross-linked more stable than brushes, could be controlled cross-linking.