Laurent Billon | Université De Pau Et Des Pays De L'adour (original) (raw)

Papers by Laurent Billon

Research paper thumbnail of Biomimetic Mussel Adhesive Inspired Anchor to Design ZnO@Poly(3-Hexylthiophene) Hybrid Core@Corona Nanoparticles

Macromolecular Rapid Communications, 2015

Research paper thumbnail of Microwave-assisted nitroxide-mediated radical polymerization of acrylamide in aqueous solution

Research paper thumbnail of Poly(ethylene oxide)- and poly (acrylamide)-based water-soluble associative polymers: synthesis, characterisation, properties in solution

Research paper thumbnail of Semicrystalline Macromolecular Design by Nitroxide-Mediated Polymerization

... EPCP UMR 5254 CNRS, Université de Pau et des Pays de l'Adour, Hélioparc, 2 Avenue du... more ... EPCP UMR 5254 CNRS, Université de Pau et des Pays de l'Adour, Hélioparc, 2 Avenue du Président Angot, 64053 Pau cedex, France. ... Chong, F. Ercole, J. Krstina, J. Jeffery, TPT Le, TA Mayadunne, GF Meijs, CL Moad, G. Moad, E. Rizzardo, SH Thang, Macromolecules 1998 ...

Research paper thumbnail of Design of Smart Oligo(ethylene glycol)-Based Biocompatible Hybrid Microgels Loaded with Magnetic Nanoparticles

Macromolecular Rapid Communications, 2014

This article reports a rational strategy for preparing smart oligo(ethylene glycol)-based hybrid ... more This article reports a rational strategy for preparing smart oligo(ethylene glycol)-based hybrid microgels loaded with high content of homogeneously distributed preformed magnetic nanoparticles (NPs) (up to 33 wt%). The strategy is based on the synthesis of biocompatible multiresponsive microgels by precipitation copolymerization of di(ethylene glycol) methyl ether methacrylate, oligo(ethylene glycol) methyl ether methacrylate, methacrylic acid, and oligo(ethylene glycol)diac-rylate. An aqueous dispersion of preformed magnetic NPs is straightforwardly loaded into the microgels. Robust monodisperse thermoresponsive magnetic microgels are produced, exhibiting a constant value of the volume phase transition temperature whatever the NPs content. The homogeneous microstructure of the initial stimuli-responsive biocompatible microgels plays a crucial role for the design of unique well-defined ethylene glycol-based thermoresponsive hybrid microgels.

Research paper thumbnail of A versatile route to functional biomimetic coatings: ionomers for honeycomb-like structures

Soft Matter, 2007

ABSTRACT Highly ordered films were prepared by spreading out carbon disulfide (CS2) solutions of ... more ABSTRACT Highly ordered films were prepared by spreading out carbon disulfide (CS2) solutions of ionomers over inorganic surfaces and for the first time over an organic surface. These ionomers, i.e. hydrophobic homopolymers or copolymers end-capped by a cationic group, were easily synthesized in a one-step reaction by a control radical process called nitroxide-mediated polymerization. Optical and electronic microscopy observations of the films lead to the definition of new criteria for the formation of such structures. Firstly, the effect of a solid support on the honeycomb structure regularity was studied. By comparing two polar substrates, it was found that a more regular organization is obtained over mica than over glass. This phenomenon may be due to the electrostatic interactions between cationic ionomer ends and oxanions of the mica surface. Moreover, for the first time, highly ordered hexagonal patterns were also created on a flexible and soft polymeric surface, a poly(vinyl chloride) sheet. Secondly, it was found that the characteristics of the polymeric chain of the ionomer and mainly its glass transition temperature play an important role in the process of formation of ordered structures. The iridescent aspect of the films, due to light diffraction and optical interferences, was studied and quantified by spectrogoniometry. Finally, results of measurements of superficial tension are discussed; the presence of a honeycomb film at the surface of a material very significantly enhances its hydrophobicity. All these criteria of highly ordered structures correlated to a water repellency and iridescent behaviours lead to a functional biomimetic material.

Research paper thumbnail of Effect of the synthetic methodology on molecular architecture: from statistical to gradient copolymers

Soft Matter, 2006

... E-mail: eve.pere@univ-pau.fr; claude.pouchan@univ-pau.fr. ... 6, J. Chiefari, YK Chong, F. Er... more ... E-mail: eve.pere@univ-pau.fr; claude.pouchan@univ-pau.fr. ... 6, J. Chiefari, YK Chong, F. Ercole, J. Krstina, J. Jeffery, TPT Le, RTA Mayadunne, GF Meijs, CL Moad, G. Moad, E. Rizzardo and SH Thang, Macromolecules, 1998, 31, 5559 CrossRef CAS Search PubMed . ...

Research paper thumbnail of In situ thermo-dependant trapping of carbon radicals: a versatile route to well-defined polymer-grafted silica nanoparticles

Soft Matter, 2007

ABSTRACT We report in this paper an original and simple method for the grafting of polymer chains... more ABSTRACT We report in this paper an original and simple method for the grafting of polymer chains on colloidal silica particles. We first synthesize an alkoxyamine bi-functional initiator, by coupling 2-methyl-2-[N-tert-butyl-N-(dimethoxyphosphoryl-2,2-dimethylpropyl)aminoxy]propionic acid (MAMA) and an acrylate coupling agent, 3-(trimethoxysilyl)propyl acrylate (TPMA). Based on the fact that MAMA dissocs. at 25°, but activates polymn. of acrylates at only 110°, it is possible to stop the reaction after the insertion of only one C:C acrylate double bond, in the temp. range 25-80°. This synthetic methodol. is called "in situ thermo-dependant trapping of carbon radicals". The "new" initiator obtained at that stage is then grafted on Stoeber silica particles, by simple condensation of its alkoxysilane functions. We show that the initiator-grafting d. is twice as high as the value obtained by our first approach of "trapping of carbon radicals". The last step of the synthesis process is the grafting from polymn. of polybutylacrylate (PBA). Transmission electron microscopy (TEM) images and small-angle neutron scattering (SANS) spectra show that the PBA-grafted silica particles are spherical, with a narrow size distribution, and do not form aggregates. Moreover, by this versatile route, the grafted polymer d., the mol. wt. and therefore the polymer-layer morphol., can be easily controlled and tuned. It can also be extended to other monomers that work well with SG1 nitroxide. [on SciFinder(R)]

Research paper thumbnail of Formation of polyacrylate brushes on silica surfaces

Polymer International, 2002

ABSTRACT

Research paper thumbnail of New Thermostable Systems: Structure/Property Relationships of Nadic Terminated Telechelic Fluorine Polyimides

Polymer International, 1996

ABSTRACT

Research paper thumbnail of Synthesis of amphiphilic diblock copolymers derived from renewable dextran by nitroxide mediated polymerization: towards hierarchically structured honeycomb porous films

Research paper thumbnail of Highly structured pH-responsive honeycomb films by a combination of a breath figure process and in situ thermolysis of a polystyrene-block-poly(ethoxy ethyl acrylate) precursor

Polymer Chemistry, 2013

ABSTRACT In the present work, we show that Cu(0)-mediated controlled radical polymerization is a ... more ABSTRACT In the present work, we show that Cu(0)-mediated controlled radical polymerization is a suitable method to synthesize high molar mass polystyrene-b-poly(ethoxy ethyl acrylate) PS-b-PEEA diblock copolymers. This method, applied at room temperature, is mandatory for complete preservation of ethoxy ethyl protecting groups during the course of polymerization. The synthesized PS-b-PEEA diblock copolymers were subsequently used for the elaboration of pH sensitive hierarchically structured honeycomb (HC) films through the Breath Figure (BF) process. The PS-b-PEEA hydrophobic honeycomb films were characterized by optical microscopy and atomic force microscopy (AFM) to reveal the hexagonal array of pores at the micrometer length scale, together with the phase segregation of the diblock copolymer. Similar to highly structured natural materials, the biomimetic honeycomb polymer films displayed intense iridescence. Moreover, the increase of surface roughness by peeling off the top layer of the PS-b-PEEA HC films produced superhydrophobic surfaces exhibiting a water contact angle of 155°. Subsequent deprotection of PEEA into pH-responsive poly(acrylic acid) (PAA) was performed in situ from the PS-b-PEEA honeycomb film by a simple thermolysis step carried out at 90 °C. The resulting PS-b-PAA honeycomb films showed a clear pH-responsive behavior with a water contact angle gap of 65° between a pH of 3 and 10.

Research paper thumbnail of Elastomer polymer brushes on flat surface by bimolecular surface-initiated nitroxide mediated polymerization

Research paper thumbnail of Block copolymer grafted-silica particles: a core/double shell hybrid inorganic/organic material

Research paper thumbnail of Functional biohybrid materials synthesized via surface-initiated MADIX/RAFT polymerization from renewable natural wood fiber: Grafting of polymer as non leaching preservative

Research paper thumbnail of Elastomer monolayers adsorbed on mica surfaces by nitroxide-mediated polymerisation

Research paper thumbnail of Hydrophobically associating polyacrylamides and their partially hydrolyzed derivatives prepared by post-modification. 1. Synthesis and characterization

Research paper thumbnail of Gradient or statistical copolymers by batch nitroxide mediated polymerization: effect of styrene/methyl acrylate feed

New Journal of Chemistry, 2006

... fr. c Centre des Matériaux de Grande Diffusion, Ecole des Mines d'Alès, Héliopar... more ... fr. c Centre des Matériaux de Grande Diffusion, Ecole des Mines d'Alès, Hélioparc, 2 Avenue du Président Angot, 64053, Pau Cedex, France ... F. Ercole, J. Krstina, J. Jeffery, TPT Le, RTA Mayadunne, GF Meijs, CL Moad, G. Moad, E. Rizzardo and SH Thang, Macromolecules, 1998 ...

Research paper thumbnail of Tailoring Highly Ordered Honeycomb Films Based on Ionomer Macromolecules by the Bottom-Up Approach

Research paper thumbnail of Amphiphilic Gradient Copolymers Shape Composition Influence on the Surface/Bulk Properties

Macromolecules, 2007

... Laboratoire de Chimie Théorique et Physico-Chimie Moléculaire, UMR 5624 CNRS, Université de P... more ... Laboratoire de Chimie Théorique et Physico-Chimie Moléculaire, UMR 5624 CNRS, Université de Pau et des Pays de l'Adour, Hélioparc 2, Avenue du Président Angot, 64053 Pau Cedex, France. ... 9) Rizzardo, E.; Chiefari, J.; Mayadunne, RTA; Moad, G.; Thang, SH Macromol. ...

Research paper thumbnail of Biomimetic Mussel Adhesive Inspired Anchor to Design ZnO@Poly(3-Hexylthiophene) Hybrid Core@Corona Nanoparticles

Macromolecular Rapid Communications, 2015

Research paper thumbnail of Microwave-assisted nitroxide-mediated radical polymerization of acrylamide in aqueous solution

Research paper thumbnail of Poly(ethylene oxide)- and poly (acrylamide)-based water-soluble associative polymers: synthesis, characterisation, properties in solution

Research paper thumbnail of Semicrystalline Macromolecular Design by Nitroxide-Mediated Polymerization

... EPCP UMR 5254 CNRS, Université de Pau et des Pays de l'Adour, Hélioparc, 2 Avenue du... more ... EPCP UMR 5254 CNRS, Université de Pau et des Pays de l'Adour, Hélioparc, 2 Avenue du Président Angot, 64053 Pau cedex, France. ... Chong, F. Ercole, J. Krstina, J. Jeffery, TPT Le, TA Mayadunne, GF Meijs, CL Moad, G. Moad, E. Rizzardo, SH Thang, Macromolecules 1998 ...

Research paper thumbnail of Design of Smart Oligo(ethylene glycol)-Based Biocompatible Hybrid Microgels Loaded with Magnetic Nanoparticles

Macromolecular Rapid Communications, 2014

This article reports a rational strategy for preparing smart oligo(ethylene glycol)-based hybrid ... more This article reports a rational strategy for preparing smart oligo(ethylene glycol)-based hybrid microgels loaded with high content of homogeneously distributed preformed magnetic nanoparticles (NPs) (up to 33 wt%). The strategy is based on the synthesis of biocompatible multiresponsive microgels by precipitation copolymerization of di(ethylene glycol) methyl ether methacrylate, oligo(ethylene glycol) methyl ether methacrylate, methacrylic acid, and oligo(ethylene glycol)diac-rylate. An aqueous dispersion of preformed magnetic NPs is straightforwardly loaded into the microgels. Robust monodisperse thermoresponsive magnetic microgels are produced, exhibiting a constant value of the volume phase transition temperature whatever the NPs content. The homogeneous microstructure of the initial stimuli-responsive biocompatible microgels plays a crucial role for the design of unique well-defined ethylene glycol-based thermoresponsive hybrid microgels.

Research paper thumbnail of A versatile route to functional biomimetic coatings: ionomers for honeycomb-like structures

Soft Matter, 2007

ABSTRACT Highly ordered films were prepared by spreading out carbon disulfide (CS2) solutions of ... more ABSTRACT Highly ordered films were prepared by spreading out carbon disulfide (CS2) solutions of ionomers over inorganic surfaces and for the first time over an organic surface. These ionomers, i.e. hydrophobic homopolymers or copolymers end-capped by a cationic group, were easily synthesized in a one-step reaction by a control radical process called nitroxide-mediated polymerization. Optical and electronic microscopy observations of the films lead to the definition of new criteria for the formation of such structures. Firstly, the effect of a solid support on the honeycomb structure regularity was studied. By comparing two polar substrates, it was found that a more regular organization is obtained over mica than over glass. This phenomenon may be due to the electrostatic interactions between cationic ionomer ends and oxanions of the mica surface. Moreover, for the first time, highly ordered hexagonal patterns were also created on a flexible and soft polymeric surface, a poly(vinyl chloride) sheet. Secondly, it was found that the characteristics of the polymeric chain of the ionomer and mainly its glass transition temperature play an important role in the process of formation of ordered structures. The iridescent aspect of the films, due to light diffraction and optical interferences, was studied and quantified by spectrogoniometry. Finally, results of measurements of superficial tension are discussed; the presence of a honeycomb film at the surface of a material very significantly enhances its hydrophobicity. All these criteria of highly ordered structures correlated to a water repellency and iridescent behaviours lead to a functional biomimetic material.

Research paper thumbnail of Effect of the synthetic methodology on molecular architecture: from statistical to gradient copolymers

Soft Matter, 2006

... E-mail: eve.pere@univ-pau.fr; claude.pouchan@univ-pau.fr. ... 6, J. Chiefari, YK Chong, F. Er... more ... E-mail: eve.pere@univ-pau.fr; claude.pouchan@univ-pau.fr. ... 6, J. Chiefari, YK Chong, F. Ercole, J. Krstina, J. Jeffery, TPT Le, RTA Mayadunne, GF Meijs, CL Moad, G. Moad, E. Rizzardo and SH Thang, Macromolecules, 1998, 31, 5559 CrossRef CAS Search PubMed . ...

Research paper thumbnail of In situ thermo-dependant trapping of carbon radicals: a versatile route to well-defined polymer-grafted silica nanoparticles

Soft Matter, 2007

ABSTRACT We report in this paper an original and simple method for the grafting of polymer chains... more ABSTRACT We report in this paper an original and simple method for the grafting of polymer chains on colloidal silica particles. We first synthesize an alkoxyamine bi-functional initiator, by coupling 2-methyl-2-[N-tert-butyl-N-(dimethoxyphosphoryl-2,2-dimethylpropyl)aminoxy]propionic acid (MAMA) and an acrylate coupling agent, 3-(trimethoxysilyl)propyl acrylate (TPMA). Based on the fact that MAMA dissocs. at 25°, but activates polymn. of acrylates at only 110°, it is possible to stop the reaction after the insertion of only one C:C acrylate double bond, in the temp. range 25-80°. This synthetic methodol. is called "in situ thermo-dependant trapping of carbon radicals". The "new" initiator obtained at that stage is then grafted on Stoeber silica particles, by simple condensation of its alkoxysilane functions. We show that the initiator-grafting d. is twice as high as the value obtained by our first approach of "trapping of carbon radicals". The last step of the synthesis process is the grafting from polymn. of polybutylacrylate (PBA). Transmission electron microscopy (TEM) images and small-angle neutron scattering (SANS) spectra show that the PBA-grafted silica particles are spherical, with a narrow size distribution, and do not form aggregates. Moreover, by this versatile route, the grafted polymer d., the mol. wt. and therefore the polymer-layer morphol., can be easily controlled and tuned. It can also be extended to other monomers that work well with SG1 nitroxide. [on SciFinder(R)]

Research paper thumbnail of Formation of polyacrylate brushes on silica surfaces

Polymer International, 2002

ABSTRACT

Research paper thumbnail of New Thermostable Systems: Structure/Property Relationships of Nadic Terminated Telechelic Fluorine Polyimides

Polymer International, 1996

ABSTRACT

Research paper thumbnail of Synthesis of amphiphilic diblock copolymers derived from renewable dextran by nitroxide mediated polymerization: towards hierarchically structured honeycomb porous films

Research paper thumbnail of Highly structured pH-responsive honeycomb films by a combination of a breath figure process and in situ thermolysis of a polystyrene-block-poly(ethoxy ethyl acrylate) precursor

Polymer Chemistry, 2013

ABSTRACT In the present work, we show that Cu(0)-mediated controlled radical polymerization is a ... more ABSTRACT In the present work, we show that Cu(0)-mediated controlled radical polymerization is a suitable method to synthesize high molar mass polystyrene-b-poly(ethoxy ethyl acrylate) PS-b-PEEA diblock copolymers. This method, applied at room temperature, is mandatory for complete preservation of ethoxy ethyl protecting groups during the course of polymerization. The synthesized PS-b-PEEA diblock copolymers were subsequently used for the elaboration of pH sensitive hierarchically structured honeycomb (HC) films through the Breath Figure (BF) process. The PS-b-PEEA hydrophobic honeycomb films were characterized by optical microscopy and atomic force microscopy (AFM) to reveal the hexagonal array of pores at the micrometer length scale, together with the phase segregation of the diblock copolymer. Similar to highly structured natural materials, the biomimetic honeycomb polymer films displayed intense iridescence. Moreover, the increase of surface roughness by peeling off the top layer of the PS-b-PEEA HC films produced superhydrophobic surfaces exhibiting a water contact angle of 155°. Subsequent deprotection of PEEA into pH-responsive poly(acrylic acid) (PAA) was performed in situ from the PS-b-PEEA honeycomb film by a simple thermolysis step carried out at 90 °C. The resulting PS-b-PAA honeycomb films showed a clear pH-responsive behavior with a water contact angle gap of 65° between a pH of 3 and 10.

Research paper thumbnail of Elastomer polymer brushes on flat surface by bimolecular surface-initiated nitroxide mediated polymerization

Research paper thumbnail of Block copolymer grafted-silica particles: a core/double shell hybrid inorganic/organic material

Research paper thumbnail of Functional biohybrid materials synthesized via surface-initiated MADIX/RAFT polymerization from renewable natural wood fiber: Grafting of polymer as non leaching preservative

Research paper thumbnail of Elastomer monolayers adsorbed on mica surfaces by nitroxide-mediated polymerisation

Research paper thumbnail of Hydrophobically associating polyacrylamides and their partially hydrolyzed derivatives prepared by post-modification. 1. Synthesis and characterization

Research paper thumbnail of Gradient or statistical copolymers by batch nitroxide mediated polymerization: effect of styrene/methyl acrylate feed

New Journal of Chemistry, 2006

... fr. c Centre des Matériaux de Grande Diffusion, Ecole des Mines d'Alès, Héliopar... more ... fr. c Centre des Matériaux de Grande Diffusion, Ecole des Mines d'Alès, Hélioparc, 2 Avenue du Président Angot, 64053, Pau Cedex, France ... F. Ercole, J. Krstina, J. Jeffery, TPT Le, RTA Mayadunne, GF Meijs, CL Moad, G. Moad, E. Rizzardo and SH Thang, Macromolecules, 1998 ...

Research paper thumbnail of Tailoring Highly Ordered Honeycomb Films Based on Ionomer Macromolecules by the Bottom-Up Approach

Research paper thumbnail of Amphiphilic Gradient Copolymers Shape Composition Influence on the Surface/Bulk Properties

Macromolecules, 2007

... Laboratoire de Chimie Théorique et Physico-Chimie Moléculaire, UMR 5624 CNRS, Université de P... more ... Laboratoire de Chimie Théorique et Physico-Chimie Moléculaire, UMR 5624 CNRS, Université de Pau et des Pays de l'Adour, Hélioparc 2, Avenue du Président Angot, 64053 Pau Cedex, France. ... 9) Rizzardo, E.; Chiefari, J.; Mayadunne, RTA; Moad, G.; Thang, SH Macromol. ...