Synthesis and characterization of pyrene bearing amphiphilic miktoarm star polymer and its noncovalent interactions with multiwalled carbon nanotubes

Abstract

A novel amphiphilic miktoarm star polymer, polystyrene-poly(ethylene glycol)-poly(methyl methacrylate), bearing a pyrene group at the end of PS arm (Pyrene-PS-PEG-PMMA) was successfully synthesized via combination of atom transfer radical polymerization and click chemistry. The structure and composition of the amphiphilic miktoarm star polymer were characterized by gel permeation chromatography and 1 H NMR.

Preparation and characterization of novel p-acryloyloxybenzaldehyde copolymers bearing pyrene or fluorescein moieties. Interaction of fluorophore with some quenchers and silver nanoparticles

“…Actually, 13 C NMR signals at 190.65 ppm due to the methyne carbon of aldehide (CH=O) were observed in all copolymers. In Figure 2(a), the peaks at 172.22 and 170.68 ppm are assignable to the ester carbon of poly(VAc-co-AcrBzA), while the signals corresponding to the aromatic carbon can be detected in the region 155.91-130.95 ppm.…”

“…The structure of all synthesized derivatives was verified by FTIR, 1 H NMR, 13 C NMR, UV/visible and fluorescence spectroscopies.…”

“…[5,6] One of the most used fluorophore is pyrene and its derivatives, which has a high fluorescence emission quantum yield and a rather long excited state lifetime. However, some effort has been made to synthesize pyrene-labeled polymers, [7][8][9][10] amphiphilic copolymers, [11][12][13] and polyelectrolytes [14][15][16] to name some examples, in order to study the structure, optical sensor ability, conformational properties, aggregates formation, or polymer micellization.…”

Synthesis of arborescent polystyrene by “click” grafting

“…The application of “click” chemistry to polymer science is now well established, since it typically allows the fast and simple creation of well‐defined and complex polymeric structures in yields previously unattainable. Several polystyrene‐containing block and star copolymers such as poly(vinylidene fluoride)‐ b ‐polystyrene, polystyrene‐ b ‐poly(γ‐propargyl‐ l ‐glutamate‐ g ‐polyhedral oligomeric silsesquioxane), polystyrene‐ b ‐poly(ethylene oxide)‐ b ‐poly( tert ‐butyl acrylate), three‐arm stars of polystyrene, poly( tert ‐butyl acrylate) and poly(ethylene glycol), miktoarm stars of poly(ethylene oxide)‐polystyrene‐poly(ε‐caprolactone), and miktoarm stars of polystyrene‐poly(ethylene glycol)‐poly(methyl methacrylate) and polystyrene‐polycaprolactone‐poly(methyl methacrylate)‐poly(ethylene glycol) have been synthesized through “click” chemistry. However to date there are no reports on the synthesis of arborescent polymers by “click” techniques.…”

Non‐covalent interactions of pyrene end‐labeled star poly(ɛ‐caprolactone)s with fullerene

“…Comparison of the two methods, the non‐covalent interaction has remarkable advantages including not destroying π system of CNMs and preventing the adsorption of various groups . In this system, non‐covalent interactions including van der Waals, π–π stacking, and C‐π between CNMs and dispersants enhance their solubility in fluid media to form stable dispersions . Using the polymeric dispersant brings several advantages reducing the entropic penalty of micelle formations and providing higher energy of interactions using conjugated polymers …”