Hyperbranched Poly(ethylene glycol)s:  A New Class of Ion-Conducting Materials

Hawker, Craig J.; Chu, Fengkui; Pomery, Peter J.; Hill, David J. T.

doi:10.1021/ma951909i

Cited by 176 publications

(158 citation statements)

References 22 publications

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“…Efforts to limit this crystallization have included numerous branch polymers with reported conductivities of 7 × 10 −5 to 10 −3 S cm −1 at 90°C. 12,13 Similarly, crosslinking can reduce crystallinity while increasing mechanical stability, 2 giving materials with moduli on the order of 10 4 −10…”

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confidence: 99%

Tunable Networks from Thiolene Chemistry for Lithium Ion Conduction

et al. 2012

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End-functionalized poly(ethylene glycol) (PEG) and polydimethylsiloxane (PDMS) were cross-linked by a thiolene reaction with a tetra-functional thiol to create robust, tunable networks. These networks were loaded with increasing amounts of lithium bis(trifluoromethane sulfonyl imide) (LiTFSI), and their ion conductivity was measured. A wide range of salt loading was achieved, allowing the investigation of both salt-in-polymer and polymer-in-salt regimes. Thermal, mechanical, and ion conductivity properties of LiTFSI-loaded PEG and PEG-PDMS networks were measured. Even at high salt loadings, both networks maintained rubber-like characteristics, which were stable over a range of temperatures (30−90°C). The PEG network with the highest salt loading showed the greatest ion conductivity, 6.7 × 10 −4 S cm −1 at 30°C, as measured by impedance spectroscopy. This system provides a route to optimize lithium ion conduction and mechanical properties.A ccess to affordable, clean energy is a well-recognized scientific and technical challenge of this century.

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Tunable Networks from Thiolene Chemistry for Lithium Ion Conduction

et al. 2012

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“…Hawker et al 202 and Itoh et al 203 reported a multistep synthetic pathway to hyperbranched polyesters consisting of oligo(ethylene glycol)s with aromatic branching units. However, because of the low mobility of the aromatic moieties, their ion conductivity was too low to match the practical standard for lithium ion batteries.…”

Section: Toward Biomedical Applicationsmentioning

confidence: 99%

Hyperbranched aliphatic polyether polyols

Schömer

Schüll

Frey

2012

J. Polym. Sci. A Polym. Chem.

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Hyperbranched polymers, dendritic macromolecules with branch-on-branch structures, have become an important polymer class since the early 1990s. They combine several advantages of the perfectly branched dendrimers with easy accessibility, typically in a one-step synthesis. Hyperbranched polyethers are a particularly interesting class of chemically stable and often biocompatible materials. Multifunctional hyperbranched polyethers with controllable molar mass and comparably low polydispersities can been prepared using hydroxyl-functional epoxides or oxetanes for polymerization via anionic and cationic polymerization mechanisms. Here, we review the progress in the preparation, characterization, and application of these uniquely versatile aliphatic polyether polyols. Their unusual mechanical, thermal, and solution properties render them useful for a variety of applications, for example, as building blocks for various complex macromolecular architectures or in biomedical applications.

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“…Dieses Konzept wurde insbesondere auf Basis von N-(2-Hydroxypropyl)methacrylamid-Copolymeren (PHPMA) als Wirkstoffträger umgesetzt. Poly(2-oxazoline), [38] Poly(glycerine) [40,65,66] und Poly(aminosäuren) [41,42] Die Dendronisierung von PEG [45,46] oder die Synthese von PEGs mit Stern-oder dendritischen Strukturen [39,[47][48][49][50] repräsentieren innovative Lçsungsansätze zur Überwindung der intrinsisch niedrigen Beladungskapazität. Ebenso wie bei Blockcopolymeren basierend auf PEG und anderen funktionellen Monomeren als Epoxiden (z.…”

Section: Introductionunclassified

Multifunktionelle Poly(ethylenglycole)

et al. 2011

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Maßgeschneiderte makromolekulare Strukturen stellen auf dem sich stetig entwickelnden Feld der Polymertherapeutika die Schlüsselkomponente dar, um das Potential bioaktiver Konjugate auszuschöpfen. Die jüngsten Entwicklungen auf dem Gebiet der Wirkstoffkonjugate zur Krebsbehandlung zeigen, dass multifunktionelle Polymere als Wirkstoffträger immer bedeutender werden. Die Anwendung des vermeintlich am besten geeigneten Polymers, Poly(ethylenglycol) (PEG), ist hier jedoch durch die limitierte Zahl funktioneller Gruppen eingeschränkt. Als Resultat ziehen multifunktionelle Copolymere basierend auf Ethylenoxid (EO) und einem entsprechenden Epoxid als Comonomer (mf‐PEGs) zunehmend Aufmerksamkeit auf sich. Wohldefiniert dargestellt durch lebende anionische Polymerisation in Kombination mit modernen Charakterisierungsmethoden – beispielsweise Messungen der Polymerisationskinetik über 1H‐NMR‐Spektroskopie in Echtzeit –, repräsentiert diese aufkommende Klasse an Polymeren eine leistungsstarke Plattform zur Synthese von Bio‐ und Wirkstoffkonjugaten.

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Hyperbranched Poly(ethylene glycol)s: A New Class of Ion-Conducting Materials

Cited by 176 publications

References 22 publications

Tunable Networks from Thiolene Chemistry for Lithium Ion Conduction

Tunable Networks from Thiolene Chemistry for Lithium Ion Conduction

Hyperbranched aliphatic polyether polyols

Multifunktionelle Poly(ethylenglycole)

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