Infrared Spectroscopic Study of the Phases and Phase Transitions in Poly(ethylene oxide) and Poly(ethylene oxide)-Lithium Trifluoromethanesulfonate Complexes

Dissanayake, M.A.K.L.; Frech, Roger

doi:10.1021/ma00119a022

Cited by 180 publications

(152 citation statements)

References 11 publications

Supporting

Mentioning

136

Contrasting

Unclassified

Order By: Relevance

“…The spectrum of anhydrous poloxamer pellet was compared to the spectra of pure crystalline PEO and PPO, which are the blocks of the copolymer. Within the C-O-C stretching region (1200-1000 cm 01 ), it was found that the pellet's spectrum coincides very well with pure crystalline PEO spectrum superposed to pure crystalline PPO spectrum in the literature (19,20) (Table 1). However, in the anhydrous poloxamer pellet spectrum, some PPO bands reported in the literature are masked by the high intensity of PEO bands.…”

Section: Methodsmentioning

confidence: 57%

See 1 more Smart Citation

Study of the Gelation Process of Polyethylene Oxidea–Polypropylene Oxideb–Polyethylene OxideaCopolymer (Poloxamer 407) Aqueous Solutions

Cabana

Aı̈t-Kadi

Juhász

1997

Journal of Colloid and Interface Science

242

143

View full text Add to dashboard Cite

Section: Methodsmentioning

confidence: 57%

“…On the other hand, the poloxamer solution spectra coincide also with pure amorphous PEO spectra superposed to pure amorphous PPO spectra in the literature (19,20). Nevertheless, these coincidences with pure PEO and PPO blocks are less exact than those in anhydrous phase for the pellet.…”

Section: Methodsmentioning

confidence: 58%

Study of the Gelation Process of Polyethylene Oxidea–Polypropylene Oxideb–Polyethylene OxideaCopolymer (Poloxamer 407) Aqueous Solutions

Cabana

Aı̈t-Kadi

Juhász

1997

Journal of Colloid and Interface Science

242

143

View full text Add to dashboard Cite

“…Moreover, FTIR bands at 1237, 1281, 1298, 1373, 2865 cm -1 were broadened considerably in Curve 2 as compared to pure P123 (Curve 1). The vibrational multiplate structure of the pure solid phase collapsed leading to a conformational change when they are dissolved in water particularly as monomers, which is already well known [45][46][47]. The bands at 963, 1061, 1150 and 1342 cm -1 have their weak signature in 3% and 5% P123 solution FTIR profiles (Curve 3 and Curve 4 respectively) which were completely absent in 0.3% P123 solution (Curve 2).…”

Section: Resultsmentioning

confidence: 83%

Block copolymer mediated stabilization of sub-5 nm superparamagnetic nickel nanoparticles in an aqueous medium

et al. 2009

View full text Add to dashboard Cite

The paper presents a facile method for decreasing the size of water dispersible Ni nanoparticles from 30 nm to 3 nm by the incorporation of a passivating surfactant combination of pluronic triblock copolymer and oleic acid into a wet chemical reduction synthesis. A detailed study revealed that the size of the Ni nanoparticles is critically governed not only by the concentration of the tri block copolymers but also dependent on the hydrophobic nature of the micelle-core formed. The synthesized Ni nanoparticles were thoroughly characterized by TEM, XRD, XPS and temperature and field dependent magnetic measurements along with a comprehensive FTIR analysis to predict a possible mechanism of formation. Mirkin and co-workers demonstrated the efficient and selective separation of His-tagged proteins using Ni-based nanorods with a diameter of about 300 nm [15]. Hyeon and co-workers have successfully proved that superparamagnetic Ni with NiO shells have a high affinity for poly histidine and can be utilized for separating and purifying His-tagged proteins from a multicomponent solution [16]. Introduction.Ni nanoparticles can be synthesised in both organic and aqueous media. The high temperature decomposition of nickel carbonyl compounds [17] or Ni(acac) 2 compounds [18] in the presence of oleylamine, tri octyl phosphine oxide (TOPO) and tri octyl phosphine (TOP) [19] are common organic routes. While these methods are capable of producing monodispersed Ni with sub 5 nm size range, partial oxidation on the surface of the particles occurs readily even with the use of more than one capping agent [19]. Furthermore, the complexity involved in the above synthetic procedures is quite evident, requiring many steps, higher temperature, inert atmosphere and the use of non-regular, toxic chemicals. Microemulsion based methods using mixtures of polar and non polar solvents have also

show abstract

“…Using infrared spectroscopy, primarily two modes can be used to investigate the dissociation tendency of the salt, the SO 3 symmetric stretching mode ms(SO 3 ) (at 1032 cm ±1 for the free triflate ion) and the CF 3 symmetric deformation mode, ds(CF 3 ) (752 cm ±1 for the free triflate anion). [31] For associated triflate ions these peaks shift, depending on the kind of the cation. From such studies it is known that LiTf forms a strongly aggregated bidentate bridging structure with the HMWPEO backbone.…”

Section: Full Papermentioning

confidence: 99%

The Influence of the Phase Morphology on the Optoelectronic Properties of Light‐Emitting Electrochemical Cells

Wenzl¹,

Pachler

Suess

et al. 2004

Adv Funct Materials

View full text Add to dashboard Cite

We report on the morphological aspects of thin films prepared from a blue–green light‐emitting conjugated polymer, (methyl‐substituted ladder‐type poly(p‐phenylene, mLPPP)), blended with a solid‐state electrolyte composed either by a crown ether, dicyclohexano‐18‐crown‐6 (DCH18C6), or a high‐molecular‐weight poly(ethylene oxide) (HMWPEO), and a Li salt, lithium trifluoromethanesulfonate (LiCF3SO3, Li triflate (LiTf)), as they have been successfully applied in light‐emitting electrochemical cells (LECs). The surface morphologies of the blend layers were investigated using atomic force microscopy (AFM) in tapping mode, and the ion distribution was probed using X‐ray analysis by means of energy‐dispersive X‐ray spectrometry (EDXS) in the scanning electron microscope (SEM). We show that the two different phase‐separation processes, the complexation tendencies of the ionic species as well as the ionic transport numbers, have tremendous influence on the performances of the corresponding LECs, revealing either rectifying or symmetric optoelectronic characteristics in forward and reverse bias directions. This opens up new possibilities for tuning the optoelectronic properties of ion‐supported organic electronic devices.

show abstract

Infrared Spectroscopic Study of the Phases and Phase Transitions in Poly(ethylene oxide) and Poly(ethylene oxide)-Lithium Trifluoromethanesulfonate Complexes

Cited by 180 publications

References 11 publications

Study of the Gelation Process of Polyethylene Oxidea–Polypropylene Oxideb–Polyethylene OxideaCopolymer (Poloxamer 407) Aqueous Solutions

Study of the Gelation Process of Polyethylene Oxidea–Polypropylene Oxideb–Polyethylene OxideaCopolymer (Poloxamer 407) Aqueous Solutions

Block copolymer mediated stabilization of sub-5 nm superparamagnetic nickel nanoparticles in an aqueous medium

The Influence of the Phase Morphology on the Optoelectronic Properties of Light‐Emitting Electrochemical Cells

Contact Info

Product

Resources

About