Non-linear effect of 18-crown-6 in propylene oxide polymerization with potassium glycidoxide used as the inimer

Stolarzewicz, Andrzej; Morejko-Buż, Barbara; Grobelny, Zbigniew; Pisarski, Wojciech A.; Frey, Holger

doi:10.1016/j.polymer.2004.07.073

Cited by 8 publications

(6 citation statements)

References 35 publications

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“…6 These telechelic APs self-assemble into starlike flowers in dilute regime and develop a fully connected network of flowers above some threshold concentration. 14 In order to improve our understanding of hydrophobic segment influence on rheological behavior, we have developed a method to prepare asymmetric functional (PEOs) by taking advantage of living anionic polymerization of ethylene oxide (EO) [15][16][17][18][19][20][21] initiated by alkoxides. The hydroxy telechelic oneended PEO is then modified by esterification.…”

Section: Introductionmentioning

confidence: 99%

“…In order to improve our understanding of hydrophobic segment influence on rheological behavior, we have developed a method to prepare asymmetric functional (PEOs) by taking advantage of living anionic polymerization of ethylene oxide (EO) – initiated by alkoxides. The hydroxy telechelic one-ended PEO is then modified by esterification.…”

Section: Introductionmentioning

confidence: 99%

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Asymmetric End-Capped Poly(ethylene oxide). Synthesis and Rheological Behavior in Aqueous Solution

et al. 2008

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A method was developed to prepare asymmetric end-capped poly(ethylene oxide)s (PEOs), containing an alkyl group on one chain end and a perfluoroalkyl group on the other one (C18H37−PEO−C2H4−C8F17 and C18H37−PEO−C10H20−C8F17). These new telechelic associative polymers (APs) were synthesized by anionic polymerization of ethylene oxide initiated by an alkoxide (C18H37−O−K+) followed by esterification. The rheological behavior of asymmetric and analogous symmetric APs in aqueous solutions has been investigated as a function of polymer concentration (C), hydrophobic end-cap and surfactant used to homogenize the system: sodium dodecyl sulfate (SDS) or lithium perfluorooctyl sulfonate (LiFOS). A steep increase of the static viscosity η, attributed to the formation of a multiconnected network, is observed for C ≈ 1 wt %. Semidilute solutions present a Maxwellian rheological behavior with only one relaxation time τ associated with the least hydrophobic end group. The viscoelastic response is modified by the interactions between hydrophobic end groups and surfactant inside mixed aggregates.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Asymmetric End-Capped Poly(ethylene oxide). Synthesis and Rheological Behavior in Aqueous Solution

et al. 2008

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“…Combining the two commercially available monomers propylene oxide and glycidol allows for the generation of copolymers with adjustable functionality and lower critical solution temperature (LCST) in one single step. Both monomers have been combined before to generate linear structures and block architectures, − but a random copolymerization, as it has recently been reported for the monomer combination ethylene oxide/glycidol has not been successful to date.…”

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confidence: 99%

Hyperbranched Poly(propylene oxide): A Multifunctional Backbone-Thermoresponsive Polyether Polyol Copolymer

2012

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Backbone-thermoresponsive hyperbranched poly-(propylene oxide)-based polyether polyols have been synthesized by anionic ring-opening copolymerization of glycidol and propylene oxide. The number of functional hydroxyl end groups and the lower critical solution temperature (LCST) can be readily adjusted by varying the comonomer ratio. Molecular weights in the range of 1200−2000 g/mol were achieved. Hyperbranched polyether polyols with LCST values between 24 and 83 °C can be obtained in a convenient one-step reaction.

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“…In this paper, we report the synthesis of PTGE using t‐ BuOK/18‐crown‐6 in high conversion suppressing deactivation of the radical moieties, and the electrochemical performance of PTGE as the cathode‐active material in a battery. 18‐Crown‐6 has been used to increase the reactivity of alkoxides by accommodating a potassium cation in the anionic ring‐opening polymerization . A combination of t‐ BuOK and 18‐crown‐6 allowed the polymerization to proceed to completion even at moderate temperatures near 40 °C which suppressed the deactivation of the radical moieties.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Poly(TEMPO‐Substituted Glycidyl Ether) by Utilizing t‐BuOK/18‐Crown‐6 for an Organic Cathode‐Active Material

Sato

Sukegawa

Oyaizu

et al. 2015

Macromolecular Symposia

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Summary: A nitroxide radical-substituted polyether, poly(TEMPO-substituted glycidyl ether) (PTGE), was synthesized using a potassium tert-butoxide/18-crown-6 initiator. The presence of 18-crown-6 effected significant improvement in the reactivity of the chain end, thus allowing the polymerization to proceed at moderate temperatures to suppress the deactivation of the pendant nitroxide group. A high molecular-weight polyether with a theoretical radical concentration was first obtained in high yield. Charging and discharging cyclability was much improved by cross-linking, which helped the electrode-active material stay on a current collector during the electrolysis. The polymer/vapor-grown carbon nanofiber composite electrode exhibited a redox capacity comparable to the formula weightbased theoretical density over 10 3 cycles and fast charging/discharging capability up to a rate of 60 C which corresponded to full charging and discharging in 60 s. The redox capacity was almost maintained for a composite layer with a remarkably high polymer ratio of 90 %, which demonstrated the presence of effective percolation network of the carbon nanofiber due likely to the affinity of the polyether to the carbon material.

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Non-linear effect of 18-crown-6 in propylene oxide polymerization with potassium glycidoxide used as the inimer

Cited by 8 publications

References 35 publications

Asymmetric End-Capped Poly(ethylene oxide). Synthesis and Rheological Behavior in Aqueous Solution

Asymmetric End-Capped Poly(ethylene oxide). Synthesis and Rheological Behavior in Aqueous Solution

Hyperbranched Poly(propylene oxide): A Multifunctional Backbone-Thermoresponsive Polyether Polyol Copolymer

Synthesis of Poly(TEMPO‐Substituted Glycidyl Ether) by Utilizing t‐BuOK/18‐Crown‐6 for an Organic Cathode‐Active Material

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