Polyelectrolytes bearing azobenzenes for the functionalization of multilayers

Fischer, Peter; Laschewsky, André; Wischerhoff, Erik; Arys, X; Jonas, Alain M.; Legras, Roger

doi:10.1002/masy.19991370103

Cited by 49 publications

(74 citation statements)

References 50 publications

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“…The same is true for other rather hydrophobic polycations 130,135) . Therefore, we suggested that successful deposition asks for appropriate matching of the charge density of the used polyelectrolyte pair, rather than for a minimum charge density 135) . Of course, if one of the partners is a standard strong polyelectrolyte, the second polyion should have a high charge density, too, to favor film growth by ESA.…”

Section: Polymers Suited For Esasupporting

confidence: 55%

“…Fortunately despite these and other 135) observations, the picture of the critical minimum charge density is oversimplified. A number of polymers have been successfully grown to films by ESA though bearing a surprisingly low density of charge 136,137) .…”

Section: Polymers Suited For Esamentioning

confidence: 91%

“…But instead of reproducible linear growth, asymptotically limited growth, or pseudo-exponential growth of multilayers may be observed for not too high numbers of deposition cycles 135,138,146) , as illustrated in Fig. 6 and 7.…”

Section: Polymers Suited For Esamentioning

confidence: 92%

“…The ionene with the longest spacer produces patchy deposits only, and coherent coatings could not be obtained 132,133) . Within the same line, ESA proceeds with irregular growth when employing poly(acrylamido-2-methyl-propanesulfonate) (4) with ionene 23 of low charge density, but proceeds well when using hyperbranched analogue 24 which has a high charge density 134,135) . According to this picture, the functionalization of organic polyelectrolytes with large functional fragments should be most critical for ESA.…”

Section: Polymers Suited For Esamentioning

confidence: 98%

“…Of course, if one of the partners is a standard strong polyelectrolyte, the second polyion should have a high charge density, too, to favor film growth by ESA. Obviously, the charge matching criterion does not apply too strictly so that polyelectrolytes with an intermediate charge density such as poly(styrene sulfonate) (6), or polymeric dye 25 26,27,102,134,135,[138][139][140][141][142][143][144][145] (cf. Fig.…”

Section: Polymers Suited For Esamentioning

confidence: 99%

See 4 more Smart Citations

Ultrathin polymer coatings by complexation of polyelectrolytes at interfaces: suitable materials, structure and properties

Bertrand

Jonas

Laschewsky³

et al. 2000

Macromol. Rapid Commun.

1,168

1,184

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A bit of historyThe key role of surfaces for many material properties as well as for many biological processes has been recognized now. Therefore, new strategies aim at the tailoring of the material's surface only -or of a thin surface layer, respectively -, while preserving the bulk properties of the underlying support. Particular emphasis has been given to the surface modification by polymers, in an attempt to extend the known versatility of polymer bulk materials to ultrathin films and coatings, and to prepare bulk-surface composite materials. The self-organization of polymers has been increasingly explored for the preparation of well-defined surfaces and interfaces in recent years, extending the use of the established methods of low molar mass compounds (for comparative reviews, see ref. 1-3)). With such techniques, polymer films are formed spontaneously on substrates, due to balanced interactions between substrate, polymer (or its precursor) and medium. Typically, very thin, often monomolecular layers are produced. Repetitive deposition steps provide a precise control over the total thickness of the coatings, in the range from a few angstroms up to the micrometer range. Moreover, the step-by-step procedures allow for a fine structuring in the third dimension. In addition to the preparation of uniform and homogeneous coatings, gratings, gradients or steps of defined height in molecular dimensions can be easily constructed.The most recent of the self-organization techniques is the alternating physisorption of oppositely charged polyelectrolytes, the so-called "layer-by-layer" method or "electrostatic self-assembly" (ESA) [3][4][5][6][7][8][9][10] . Although some early, singular studies of self-assembly by alternating adsorption of oppositely charged polyions are reported [11][12][13] , a practical method for ESA was developed Feature Article: The article presents the state-of-the-art of alternating physisorption of oppositely charged polyelectrolytes, the so-called "layer-by-layer" method or "electrostatic self-assembly" (ESA), for the preparation of thin polymer coatings. In comparison to other, more established self-organization techniques, this recent method is distinguished by its simplicity, versatility, and speed. In particular, the tendency for self-healing is unique. Emphasis is given to the role of the molecular structure of the polyelectrolytes, and to the nature of the support. Also, various parameters for the preparation of multilayer films are highlighted, which are very important due to the kinetic control of the build-up process. The structure of the resulting coatings, their quality and stability, chemical reactions in the films, and potential applications are discussed.Macromol. Rapid Commun. 21, No. 7

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Section: Polymers Suited For Esasupporting

confidence: 55%

Section: Polymers Suited For Esamentioning

confidence: 91%

Section: Polymers Suited For Esamentioning

confidence: 92%

Section: Polymers Suited For Esamentioning

confidence: 98%

Section: Polymers Suited For Esamentioning

confidence: 99%

See 3 more Smart Citations

Ultrathin polymer coatings by complexation of polyelectrolytes at interfaces: suitable materials, structure and properties

Bertrand

Jonas

Laschewsky³

et al. 2000

Macromol. Rapid Commun.

1,168

1,184

View full text Add to dashboard Cite

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Controlled Electrodissolution of Polyelectrolyte Multilayers: A Platform Technology Towards the Surface‐Initiated Delivery of Drugs

Boulmedais

Tang

Keller

et al. 2005

Adv Funct Materials

113

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A novel method for the electrochemical dissolution of polyelectrolyte multilayers from the surface of an electrode for applications in controlled drug delivery is reported. Biodegradable and biocompatible multilayer films based on poly(L‐lysine) and heparin have been selected as a model system, and have been built on an indium tin oxide semiconductor substrate. The build‐up and dissolution processes of the multilayers is followed by electrochemical optical waveguide light mode spectroscopy. The formation and stability of the polyelectrolyte multilayers have been found to depend on the applied potential and the ionic strength of the buffer. The application of potentials above a threshold of 1.8 V induces dissolution, which follows single‐exponential kinetics, of the polyelectrolyte multilayer film. The rate of this process can be varied by an on–off profile of the potential, leading to the controlled release of heparin into the bulk. Atomic force microscopy investigations show that the electrodissolution of the polyelectrolyte multilayers is a local phenomenon that leads to the formation of nanoporous films.

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Synthesis of Optically Active Photoresponsive Multifunctional Polymer Containing the Side‐Chain Azocarbazole Chromophore

Angiolini

Benelli

Giorgini

et al. 2006

Macro Chemistry & Physics

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Summary: A new optically active photochromic polymethacrylate containing the carbazole moiety, deriving from the chiral monomer (S)‐(4‐cyanophenyl)‐(3‐{9‐[2‐(2‐methacryloyloxypropanoyloxy)ethyl]carbazolyl})diazene [(S)‐MLECA] has been prepared and fully characterized with the aim to obtain a multifunctional derivative possessing at the same time chemical moieties suitable to NLO and optical storage, to chiroptical switches, and to photorefractive and photoconductive applications. Spectroscopic, thermal and chiroptical characterizations clearly indicate the occurrence of dipolar interactions between chromophores and the presence of an ordered chiral conformation of one prevailing helical handedness, at least for chain segments of the macromolecules.Structure of poly[(S)‐MLECA].magnified imageStructure of poly[(S)‐MLECA].

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Polyelectrolytes bearing azobenzenes for the functionalization of multilayers

Cited by 49 publications

References 50 publications

Ultrathin polymer coatings by complexation of polyelectrolytes at interfaces: suitable materials, structure and properties

Ultrathin polymer coatings by complexation of polyelectrolytes at interfaces: suitable materials, structure and properties

Controlled Electrodissolution of Polyelectrolyte Multilayers: A Platform Technology Towards the Surface‐Initiated Delivery of Drugs

Synthesis of Optically Active Photoresponsive Multifunctional Polymer Containing the Side‐Chain Azocarbazole Chromophore

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