Complexing of Na† ion with polyethylene glycol

Arkhipovich, G. N.; Dubrovskii, S. A.; Kazanskii, K. S.; Shupik, A.N.

doi:10.1016/0032-3950(81)90423-8

Cited by 12 publications

(11 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Being water-soluble and nonionic, it does not interfere with electrostatic stabilization of the nematic suspensions. Moreover, PEG is known to form complexes with Na + , 42 and, consequently, intercalated phases with two different PEG volumes may be obtained 36 because phase separation is counterpoised by interaction with the interlayer cation.…”

Section: Resultsmentioning

confidence: 99%

Nanoscale-Structured Hybrid Bragg Stacks with Orientation- and Composition-Dependent Mechanical and Thermal Transport Properties: Implications for Nacre Mimetics and Heat Management Applications

Dörres

Bartkiewicz

Herrmann

et al. 2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Layered nanomaterials fascinate researchers for their mechanical, barrier, optical, and transport properties. Nacre is a biological example thereof, combining excellent mechanical properties by aligned submicron inorganic platelets and nanoscale proteinic interlayers. Mimicking nacre with advanced nanosheets requires ultraconfined organic layers aimed at nacre-like high reinforcement fractions. We describe inorganic/polymer hybrid Bragg stacks with one or two fluorohectorite clay layers alternating with one or two poly(ethylene glycol) layers. As indicated by X-ray diffraction, perfect one-dimensional crystallinity allows for homogeneous single-phase materials with up to a 84% clay volume fraction. Brillouin light spectroscopy allows the exploration of ultimate mechanical moduli without disturbance by flaws, suggesting an unprecedentedly high Young’s modulus of 162 GPa along the aligned clays, indicating almost ideal reinforcement under these conditions. Importantly, low heat conductivity is observed across films, κ ⊥ = 0.11–0.15 W m –1 K –1 , with a high anisotropy of κ ∥ /κ ⊥ = 28–33. The macroscopic mechanical properties show ductile-to-brittle change with an increase in the clay volume fraction from 54% to 70%. Conceptually, this work reveals the ultimate elastic and thermal properties of aligned layered clay nanocomposites in flaw-tolerant conditions.

show abstract

Section: Resultsmentioning

confidence: 99%

Nanoscale-Structured Hybrid Bragg Stacks with Orientation- and Composition-Dependent Mechanical and Thermal Transport Properties: Implications for Nacre Mimetics and Heat Management Applications

Dörres

Bartkiewicz

Herrmann

et al. 2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…The lack of a significant induction period might be attributed to a chain-length effect, as PEO is known to be a good complexation agent for alkali metal cations. [34][35][36][37][38][39] Furthermore, it has been found that complexation of the RO À M þ ion pair by the growing PEO chain results in an auto-acceleration during the early stage of EO polymerization (degree of polymerization DP < 4-6). [2,40] Consequently, complexation of the Li þ counterion by the PEO macroinitiator might result in an additional weakening of lithium alkoxide aggregates.…”

Section: Resultsmentioning

confidence: 99%

Anionic Polymerization of Ethylene Oxide in the Presence of the Phosphazene Base Bu^tP₄ – Kinetic Investigations Using In‐Situ FT‐NIR Spectroscopy and MALDI‐ToF MS

Schmalz

Lanzendörfer

Abetz

et al. 2003

Macro Chemistry & Physics

View full text Add to dashboard Cite

Fourier‐transform near‐infrared (FT‐NIR) fiber‐optic spectroscopy was successfully used to monitor the anionic polymerization of ethylene oxide (EO). Kinetic data are provided for the polymerization of EO with the sec‐BuLi/ButP4 initiating system under different reaction conditions. In addition, the influence of different initiators and reaction conditions on the polymerization of EO is investigated. Online monitoring using NIR spectroscopy reveals an unexpected induction period present in EO homopolymerizations as well as in the synthesis of PEO containing block copolymers with [Li/ButP4]+ counterions. The resulting polymers are characterized by size exclusion chromatography (SEC). A low‐molecular‐weight polystyrene‐block‐poly(ethylene oxide) (PS‐b‐PEO) diblock copolymer was synthesized to gain more insight into the observed induction period by matrix‐assisted laser desorption ionization time‐of‐flight mass spectrometry (MALDI‐ToF MS) on samples taken during EO polymerization. The induction period is believed to be a result of different factors involved in the formation of active centers, for example, the break up of lithium alkoxide aggregates by the phosphazene base ButP4, and chain length effects. It depends on reaction temperature, concentration of the phosphazene base ButP4, as well as the structure of the initiator.SEC traces for EO homopolymerizations using different initiating systems at 50 °C.magnified imageSEC traces for EO homopolymerizations using different initiating systems at 50 °C.

show abstract

“…The most polymeric organic substances contain a large number of hydrophilic functional groups (-COO − , -OH, -CONH 2 , -RO − , -RS − , etc. ), and these functional groups contain electron donor elements (O, N, and S) capable of complex formation with metal ions [4][5][6][7][8]. It is also well established that water-soluble particulate organic materials of high-molecular-weight compounds adsorb or chemically bound to hydrous oxides of Fe 3+ , Al 3+ , Si 4+ and Mn 2+ etc.…”

Section: Introductionmentioning

confidence: 99%

Effects of vinyl series polymers on the formation of hematite particles in a forced hydrolysis reaction

Kandori

Yamoto

Ishikawa

2005

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

Complexing of Na† ion with polyethylene glycol

Cited by 12 publications

References 24 publications

Nanoscale-Structured Hybrid Bragg Stacks with Orientation- and Composition-Dependent Mechanical and Thermal Transport Properties: Implications for Nacre Mimetics and Heat Management Applications

Nanoscale-Structured Hybrid Bragg Stacks with Orientation- and Composition-Dependent Mechanical and Thermal Transport Properties: Implications for Nacre Mimetics and Heat Management Applications

Anionic Polymerization of Ethylene Oxide in the Presence of the Phosphazene Base Bu^tP₄ – Kinetic Investigations Using In‐Situ FT‐NIR Spectroscopy and MALDI‐ToF MS

Effects of vinyl series polymers on the formation of hematite particles in a forced hydrolysis reaction

Contact Info

Product

Resources

About

Complexing of Na† ion with polyethylene glycol

Cited by 12 publications

References 24 publications

Nanoscale-Structured Hybrid Bragg Stacks with Orientation- and Composition-Dependent Mechanical and Thermal Transport Properties: Implications for Nacre Mimetics and Heat Management Applications

Nanoscale-Structured Hybrid Bragg Stacks with Orientation- and Composition-Dependent Mechanical and Thermal Transport Properties: Implications for Nacre Mimetics and Heat Management Applications

Anionic Polymerization of Ethylene Oxide in the Presence of the Phosphazene Base ButP4 – Kinetic Investigations Using In‐Situ FT‐NIR Spectroscopy and MALDI‐ToF MS

Effects of vinyl series polymers on the formation of hematite particles in a forced hydrolysis reaction

Contact Info

Product

Resources

About

Anionic Polymerization of Ethylene Oxide in the Presence of the Phosphazene Base Bu^tP₄ – Kinetic Investigations Using In‐Situ FT‐NIR Spectroscopy and MALDI‐ToF MS