Photocrosslinkable Star Polymers: Precursors for Model Polyelectrolyte Networks

Mengel, C.; Meyer, Wolfgang; Wegner, Gerhard

doi:10.1002/1521-3935(20010401)202:7<1138::aid-macp1138>3.0.co;2-1

Cited by 27 publications

(25 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Also the distribution and type of strand lengths, the role of entanglements, and the presence and unknown number of dangling ends introduces many unknown/controllable features. Despite recent progress in that respect, allowing to synthesize well‐defined model PE networks based on the photodimerization of monodisperse star polymers from poly( tert‐ butyl methacrylate) (P t BMA) star precursor polymers with subsequent photo‐crosslinking,20 equilibrium properties in general do depend on the exact preparation process of the gel (e.g., active ends and N ‐functional crosslinking agents).…”

Section: Introductionmentioning

confidence: 99%

Hydrogels in Poor Solvents: A Molecular Dynamics Study

Mann

Kremer

Lenz

et al. 2011

Macro Theory & Simulations

View full text Add to dashboard Cite

The equilibrium swelling behavior of a crosslinked polyelectrolyte gel under poor‐solvent conditions is examined. To this end, MD simulations of a coarse‐grained network model with a diamond‐like topology are employed where the counterions are explicitly taken into account. A large range of different parameter combinations in the fraction f of charged monomers of the network, the strength of electrostatic interactions measured via the Bjerrum length $\ell _{{\rm B}} $, and various strand lengths are studied. The results agree with data on single PE chains, in particular the theoretically predicted pearl necklace conformations can be identified as well as a sausage‐like regime in the strong‐coupling region.magnified image

show abstract

Section: Introductionmentioning

confidence: 99%

Hydrogels in Poor Solvents: A Molecular Dynamics Study

Mann

Kremer

Lenz

et al. 2011

Macro Theory & Simulations

View full text Add to dashboard Cite

show abstract

“…In contrast, defined multifunctional terminating agents circumvent this problem. Thus, poly(methacrylic acid) (PMAA) and PAA stars with three, four, and eight arms37,38 were obtained.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization and Behavior in Aqueous Solution of Star‐Shaped Poly(acrylic acid)

Plamper

Becker

Lanzendörfer

et al. 2005

Macro Chemistry & Physics

182

185

View full text Add to dashboard Cite

Summary: We report the synthesis of star‐shaped poly(acrylic acid) (PAA), with 5, 8, and 21 arms, by atom transfer radical polymerization of tert‐butyl acrylate. We employ the core‐first approach using glucose‐, saccharose‐ and cyclodextrin‐based initiators. Subsequent acidic treatment of poly(tert‐butyl acrylate) (PtBA) leads to star‐shaped poly(acrylic acid) (PAA). Alkaline cleavage of the arms enabled us to determine the initiation site efficiency. The PAA stars and arms were esterified to poly(methyl acrylate) (PMA). Molecular weight determination by means of GPC/viscosity, MALDI‐TOF MS and NMR end‐group determination showed that the initiation site efficiency is close to unity. Results from potentiometric titration of PAA arms and stars show that the apparent pKa values increase with increasing arm number, which is a direct result of increasing segment density. Osmometry measurements of aqueous solutions of the PAA stars result in osmotic coefficients between 0.05 and 0.38, indicating that most of the counterions are confined within the star. The confinement increases with arm number.

show abstract

“…In recent years, POSS have attracted significant attention because they can be used as templates for fabricating nanostructured materials such as star polymers [14][15][16], catalysts [17,18], and dendrimers [19]. In addition, POSS can be part of "self-healing" high temperature (nano)composites used in coatings [20,21].…”

Section: Introductionmentioning

confidence: 99%

Insertion of Iron Decorated Organic–Inorganic Cage-Like Polyhedral Oligomeric Silsesquioxanes between Clay Platelets by Langmuir Schaefer Deposition

Potsi

Gengler

et al. 2020

Materials

View full text Add to dashboard Cite

Tuning the architecture of multilayer nanostructures by exploiting the properties of their constituents is a versatile way to develop multifunctional films. Herein, we report a bottom-up approach for the fabrication of highly ordered hybrid films consisting of dimethyldioctadecylammonium (DODA), iron decorated polyhedral oligomeric silsesquioxanes (POSS), and montmorillonite clay platelets. Clay platelets provided the template where Fe/POSS moieties were grafted by the use of the surfactant. Driven by the iron ions present, DODA adopted a staggered arrangement, which is essential to realize the controllable layer-by-layer growth of the film. The elemental composition of the film was studied by X-ray photoelectron spectroscopy and X-ray reflectivity confirmed the existence of smooth interfaces between the different layers.

show abstract

Photocrosslinkable Star Polymers: Precursors for Model Polyelectrolyte Networks

Cited by 27 publications

References 21 publications

Hydrogels in Poor Solvents: A Molecular Dynamics Study

Hydrogels in Poor Solvents: A Molecular Dynamics Study

Synthesis, Characterization and Behavior in Aqueous Solution of Star‐Shaped Poly(acrylic acid)

Insertion of Iron Decorated Organic–Inorganic Cage-Like Polyhedral Oligomeric Silsesquioxanes between Clay Platelets by Langmuir Schaefer Deposition

Contact Info

Product

Resources

About