Nanostructure and Rheology of Hydrogen-Bonding Telechelic Polymers in the Melt: From Micellar Liquids and Solids to Supramolecular Gels

Tingzi Yan; Klaus Schröter; Florian Herbst; Wolfgang H. Binder; Thomas Thurn-Albrecht

doi:10.1021/ma402007f

Nanostructure and Rheology of Hydrogen-Bonding Telechelic Polymers in the Melt: From Micellar Liquids and Solids to Supramolecular Gels

Macromolecules ◽

10.1021/ma402007f ◽

2014 ◽

Vol 47 (6) ◽

pp. 2122-2130 ◽

Cited By ~ 59

Author(s):

Tingzi Yan ◽

Klaus Schröter ◽

Florian Herbst ◽

Wolfgang H. Binder ◽

Thomas Thurn-Albrecht

Keyword(s):

Hydrogen Bonding ◽

Telechelic Polymers ◽

Supramolecular Gels

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Supramolecular Polymer Materials: Chain Extension of Telechelic Polymers Using a Reactive Hydrogen-Bonding Synthon

Advanced Materials ◽

10.1002/1521-4095(200006)12:12<874::aid-adma874>3.0.co;2-c ◽

2000 ◽

Vol 12 (12) ◽

pp. 874-878 ◽

Cited By ~ 432

Author(s):

B. J. B. Folmer ◽

R. P. Sijbesma ◽

R. M. Versteegen ◽

J. A. J. van der Rijt ◽

E. W. Meijer

Keyword(s):

Hydrogen Bonding ◽

Polymer Materials ◽

Chain Extension ◽

Supramolecular Polymer ◽

Telechelic Polymers

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Supramolecular pyridyl urea gels as soft matter with antibacterial properties against MRSA and/or E. coli

Chemical Communications ◽

10.1039/c4cc04028g ◽

2014 ◽

Vol 50 (74) ◽

pp. 10819-10822 ◽

Cited By ~ 21

Author(s):

Komala Pandurangan ◽

Jonathan A. Kitchen ◽

Salvador Blasco ◽

Francesca Paradisi ◽

Thorfinnur Gunnlaugsson

Keyword(s):

Hydrogen Bonding ◽

Soft Matter ◽

Antibacterial Properties ◽

Antimicrobial Properties ◽

E Coli ◽

Supramolecular Gels

The development of a family of twelve aryl pyridyl ureas, their crystallography and the ability of a number of these to form hydrogen bonding supramolecular gels with antimicrobial properties are described.

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A Molecular Picture for the Thermo-Reversibility of Gels Formed by Isophthalic Acid-Ended Telechelic Polymers

MRS Proceedings ◽

10.1557/opl.2015.638 ◽

2015 ◽

Vol 1794 ◽

pp. 9-14

Author(s):

Boyu Li ◽

Joey Kim ◽

Julie Kornfield

Keyword(s):

Hydrogen Bonding ◽

Aggregation Number ◽

Polymer Concentration ◽

Isophthalic Acid ◽

Solution Temperature ◽

Present System ◽

Measured Temperature ◽

Telechelic Polymers ◽

End Groups ◽

Molecular Picture

ABSTRACTWe demonstrate that isophthalic acid-ended telechelic poly(1,5-cyclooctadiene)s (A-PCODs) form thermo-reversible gels in non-polar solvent with a unique molecular mechanism for their thermo-reversibility. Like other associative telechelic polymers, A-PCODs form “flower-like” micelles at low concentration and form gels through bridging at higher concentration which exhibit linear viscoelasticity. However, unlike the widely studied hydrophobically end-capped PEOs, A-PCODs show clear thermo-reversibility in viscosity and dynamic modulus around 30 °C due to the hydrogen-bonding end groups. In addition, they differ from other reported thermo-reversible gelators (eg. Pluronics, PNIPAm containing block copolymers, etc.): neither the end group nor the backbone in the present system has a critical solution temperature within the measured temperature range (0 °C to 60 °C), indicating that the present system has a unique mechanism for its thermo-reversibility. To obtain a molecular picture of the mechanism, rheology and small angle neutron scattering (SANS) studies were implemented. Topological changes above the transition temperature (30 °C) were observed in both oscillatory rheology and SANS. SANS reveals that the size of clusters, which are formed by interacting micelles, depends highly on temperature (T) but independent of polymer concentration. These results cannot be explained by current theories on associative telechelic polymers which assume constant and large aggregation number of end groups at all temperatures and concentrations. We hypothesize that the temperature-sensitive sol-gel transition is due to a decrease in aggregation number for T above the critical temperature in our system, and this temperature-dependence of aggregation number is further determined by the chemical structure and hydrogen-bonding property of isophthalic acid ends.

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Evaluating the role of a urea-like motif in enhancing the thermal and mechanical strength of supramolecular gels

CrystEngComm ◽

10.1039/d0ce01194k ◽

2021 ◽

Author(s):

Daníel Arnar Tómasson ◽

Dipankar Ghosh ◽

M. R. Prathapachandra Kurup ◽

Matthew T. Mulvee ◽

Krishna K. Damodaran

Keyword(s):

Hydrogen Bonding ◽

Mechanical Strength ◽

Supramolecular Gels ◽

Hydrazone Compound

Enhanced thermal and mechanical strength in semicarbazone gels with a urea-like motif obtained by modifying the hydrogen bonding motif of the hydrazone compound.

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