Narrowly distributed poly(N-vinyl caprolactam) obtained by the MADIX/RAFT process was used for preparation of novel thermoresponsive gold nanoparticles presenting a sharp reversible response to temperature, which can be easily modulated near physiological temperature simply changing polymer molecular weight or concentration.

This article is the first comprehensive review on study and use of vinyl ester monomers in reversible addition fragmentation chain transfer (RAFT) polymerization. It covers all synthetic aspects associated with definition precision polymers comprising poly(vinyl ester) building blocks, such as choice RAFT agent reaction conditions order to progress from simple complex macromolecular architectures. Although acetate was by far most studied monomer range, many esters have been considered tune...

We herein report the synthesis of original vinylidene fluoride (VDF)-based amphiphilic block copolymers by RAFT/MADIX polymerization. The controlled polymerization VDF could be successfully mediated a xanthate chain transfer agent as evidenced size exclusion chromatography (SEC), 19F NMR, and matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) analysis. Copolymers perfluoro(methyl vinyl ether) (PMVE) varying lengths were also obtained. Finally, direct...

This review is meant to give the reader an insight into hybrids incorporating different types of nanoparticles, e.g. metallic or metal oxides, within lyotropic and thermotropic liquid crystals, from relatively small calamitic molecules larger discotics polymers. In particular, this highlights importance nanoparticle–liquid crystal interactions in accessing hybrid materials that exhibit synergetic properties.

The ability to self-assemble was evaluated for a large variety of amphiphilic block copolymers, including poly(ethyleneoxide-b-ε-caprolactone), poly(ethyleneoxide-b-d,l-lactide), poly(ethyleneoxide-b-styrene), poly(ethyleneoxide-b-butadiene) and poly(ethyleneoxide-b-methylmethacrylate). Different methods formation are discussed, such as cosolvent addition, film hydration or electroformation. influence experimental parameters macromolecular structures on the size morphology final...

Mixing double-hydrophilic block copolymers containing a poly(acrylic acid) with gadolinium ions in water leads to the spontaneous formation of polymeric nanoparticles. With an average diameter near 20 nm, nanoparticles are exceptionally stable, even after dilution and over large range pH ionic strength. High magnetic relaxivities were measured vitro for these biocompatible colloids, vivo resonance imaging on rats demonstrates potential utility such assemblies.

The synthesis and characterization of a new family dendritic polymers comprising hyperbranched polyamidoamine core polyethyleneglycol-derivative units is reported. mentioned have either core−shell or core−multishell architectures. Their intrinsic properties (solubility in wide range solvents, ability to interact with hydrophilic hydrophobic compounds, etc.) allows the one-step situ water-soluble ZnO quantum dots via decomposition an organometallic precursor. effect structural polymer (nature...

The novel monomer, vinyl trifluorobutyrate (VTFBu), when polymerized in a controlled fashion by RAFT/MADIX polymerization with xanthate transfer agent, yields poly(vinyl ester)s improved solubility supercritical carbon dioxide. thermodynamic parameters controlling the of VTFBu/vinyl acetate statistical copolymers are discussed based on ab initio calculations, glass transition temperatures copolymers, and surface tension measurements. enhanced this new class CO2-philic polymer combined its...

Thermoresponsive hydrogels were successfully prepared from poly(N-isopropylacrylamide)-based polymers with different architectures (linear, branched, or hyperbranched). The macromolecular strongly influence the internal structure of hydrogels, therefore modulating their thermoresponsive and rheological properties. These used for in situ synthesis gold nanoparticles. Significant changes hydrogel microstructures average pore size due to presence nanoparticles observed. Additionally,...

Hyperbranched poly(ethylenimine) (PEI) with amino groups or carbohydrate terminal have been used as support materials for metal nanoparticles (i.e., Cu, Ag, Au, and Pt) in water. Various parameters optimized, such pH, concentration of the polymer solution, [metal ions]/[polymer] ratio order to obtain stable a narrow size distribution. TEM measurements revealed that particles diameter low 1.4 nm were obtained. An increase stability was obtained after functionalization PEI glycidol,...

Hyperbranched polymers chemically analogous to PAMAM dendrimers and their gluconamide derivatives were synthesized, use for gold nanoparticle synthesis stabilization is reported. This was achieved by a two-step process: complexation of metal ions within the then chemical reduction. The effect pH values, polymer concentration, reduction conditions on formation nanoparticles has been evaluated. Furthermore, when compared dendrimers, these experiments clearly demonstrated influence...

The phase diagram and microstructure of the ternary system ionic, liquid benzylpyridinium bis(trifluoromethanesulfonyl)imide)/nonionic surfactant (octylphenol ethoxylate)/toluene, were studied by using conductivity measurements, dynamic light scattering, pulse field gradient spin-echo NMR, small-angle neutron scattering. Three microregions identified measurements according to percolation theory. sizes IL-in-oil microemulsions with various IL fractions then determined NMR DLS found be in...

An enhancement of poly(vinyl ester) solubility in supercritical carbon dioxide (sc-CO(2)) can be achieved by decreasing the strength polymer-polymer interactions. To demonstrate this, a library statistical copolymers vinyl acetate and trifluoroacetate was synthesized RAFT/MADIX polymerization with varying compositions at given number-average molecular weight. These exhibited unprecedentedly low cloud-point pressures sc-CO(2) 40 °C compared previously reported esters). Surface tension...

We present a simple protocol to obtain versatile assemblies of nanoparticles from aqueous dispersions onto charge patterns written by atomic force microscopy, on 100 nm thin film polymethylmethacrylate spin-coated silicon wafers. This nanoxerography uses two-stage development involving incubation the desired colloidal dispersion and subsequent immersion in an adequate water-soluble alcohol. The whole process takes only few minutes. Numerical simulations evolution electric field generated...

We investigated the structure–property relationships between poly(vinyl acetate)-based (co)polymers and their solubility in supercritical carbon dioxide. Building on RAFT/MADIX polymerization, key macromolecular characteristics—chain length, chain-end group composition—of these were studied. Their sc-CO2 was determined by high-pressure infrared spectroscopy, thereby providing guidelines for design.

The formation of vesicles from 1,2-dipalmitoyl-sn-glycero-3-phosphatidylcholine (DPPC) in several room-temperature ionic liquids, namely, 1-butyl-3-methylimidazolium tetrafluoroborate (BmimBF(4)), hexafluorophosphate (BmimPF(6)), 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EmimNTf(2)), and N-benzylpyridinium (BnPyNTf(2)), as well a water/BmimBF(4) mixture, was investigated. In pure observations by staining transmission electron microscopy demonstrated clearly the spherical...

Poly(ethylene glycol)–poly(vinylphosphonic acid) double hydrophilic block copolymers were synthesized by RAFT/MADIX polymerization and used to prepare stable iron oxide nanoparticles.

Doubly thermo- and pH-responsive poly(N-isopropylacrylamide)-block-poly(N,N-diethylamino ethyl acrylamide) (PNIPAM-b-PDEAEAM) with different compositions were synthesized by reversible addition–fragmentation chain-transfer (RAFT) polymerization. The properties (solubility, self-assembly behavior) of these polymers corresponding homopolymers in solution depend on the value pH protonation degree diethylamino moiety. effect nature polymer chain ends also appears to be critical fully understand...

Hybrid polyionic complexes (HPICs) are colloidal structures with a charged core rich in metal ions and neutral hydrophilic corona. Their properties, whether as reservoirs or catalysts, depend on the accessibility environment of ions. This study demonstrates that modifying coordination sphere these can tune properties HPICs by altering composition complexing block varying formulation conditions. Hence, double copolymers were synthesized using RAFT polymerization, polyethylene glycol different...