Amphiphilic graft copolymers with poly(oxy ethylene) side chains: supermolecular structure in solid state

Mihaylova, Milena; Krestev, V.; Kresteva, M.; Amzil, Aissa; Berlinova, Iliyana V.

doi:10.1016/s0014-3057(00)00103-8

Cited by 35 publications

(19 citation statements)

References 23 publications

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“…The appearance of amorphous region or the reduction of crystalline region would give a high ionic conductivity as com< pared to the crystalline or semicrystalline region as reported elsewhere [16][17][18][19][20][21]. The indexing of the two PEO peaks is reported to be at 19.5°and at 23.5°of monoclinic system [22]. The characteristic diffraction peaks of crystalline PEO are apparent between 2θ015°-40° [23,24].…”

Section: Resultssupporting

confidence: 62%

Effect of NiO nanofiller concentration on the properties of PEO-NiO-LiClO4 composite polymer electrolyte

Fahmi

Ahmad

Rahman

et al. 2012

J Solid State Electrochem

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Composite polymer electrolyte films comprising polyethylene oxide (PEO) as the polymer host, LiClO 4 as the dopant, and NiO nanoparticle as the inorganic filler was prepared by solution casting technique. NiO inorganic filler was synthesized via sol-gel method. The effect of NiO filler on the ionic conductivity, structure, and morphology of PEO-LiClO 4 -based composite polymer electrolyte was investigated by AC impedance spectroscopy, X-ray diffraction, and scanning electron microscopy, respectively. It was observed that the conductivity of the electrolyte increases with NiO concentration. The highest room temperature conductivity of the electrolyte was 7.4×10 −4 S cm −1 at 10 wt.% NiO. The observation on structure shows the highest conductivity appears in amorphous phase. This result has been supported by surface morphology analysis showing that the NiO filler are well distributed in the samples. As a conclusion, the addition of NiO nanofiller improves the conductivity of PEO-LiClO 4 composite polymer electrolyte.

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Section: Resultssupporting

confidence: 62%

Effect of NiO nanofiller concentration on the properties of PEO-NiO-LiClO4 composite polymer electrolyte

Fahmi

Ahmad

Rahman

et al. 2012

J Solid State Electrochem

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“…1 a XRD pattern of PEO 25 -NaI + x wt% SnO 2 films (x=0, 1, 2, 5, 10, 15). b Effect of filler on changes in PEO diffraction peaks in PEO 25 -NaI+x wt% SnO 2 films (x=0, 1, 2, 5, 10,15) observed in terms of shift in peak position towards low angle side and peak broadening, appear to be more intensified with increasing filler concentration as recorded and presented in Fig. 1a and b.…”

Section: Structure and Morphologymentioning

confidence: 77%

“…The pattern has typical features such as: (1) a back ground hump, (2) two characteristic peaks of PEO host polymer at 2θ∼19°and 23°, and (3) SnO 2 filler peaks at ∼24.5°, 34°, and 52°appearing well marked for higher filler concentrations [14]. The indexing of two PEO peaks are reported to be (120) at 19.5°and (032)+(112) at 23.5°of a monoclinic system respectively [15]. These observations suggest a multiphase feature of the CPE films comprising of a combination of both the crystalline and amorphous phases in the polymer host (PEO), and this feature remains intact on complexation with salt as demonstrated by Liquan et al [16] for polymeric conductor.…”

Section: Structure and Morphologymentioning

confidence: 94%

Studies on PEO-based sodium ion conducting composite polymer films

Mohapatra

Thakur

Choudhary

2007

Ionics

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A sodium ion conducting composite polymer electrolyte (CPE) prepared by solution-caste technique by dispersion of an electrochemically inert ceramic filler (SnO 2 ) in the PEO-salt complex matrix is reported. The effect of filler concentration on morphological, electrical, electrochemical, and mechanical stability of the CPE films has been investigated and analyzed. Composite nature of the films has been confirmed from X-ray diffraction and scanning electron microscopy patterns. Room temperature d.c. conductivity observed as a function of filler concentration indicates an enhancement (maximum) at 1-2 wt% filler concentration followed by another maximum at ∼10 wt% SnO 2 . This two-maxima feature of electrical conductivity as a function of filler concentration remains unaltered in the CPE films even at 100°C (i.e., after crystalline melting), suggesting an active role of the filler particles in governing electrical transport. Substantial enhancement in the voltage stability and mechanical properties of the CPE films has been noticed on filler dispersion. The composite polymer films have been observed to be predominantly ionic in nature with t ion ∼ 0.99 for 1-2 wt% SnO 2 . However, this value gets lowered on increasing addition of SnO 2 with t ion ∼0.90 for 25 wt% SnO 2 . A calculation of ionic and electronic conductivity for 25 wt% of SnO 2 film works out to be ∼2.34×10 −6 and 2.6×10 −7 S/cm, respectively.

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“…The ability of this polymer to crystallise also as component of other block-copolymers has been recently reported [15]. It has been found that in this case the distortion of its monoclinic phase is due to the formation of crystal lamellae proceeding under stress [15].…”

Section: Introductionmentioning

confidence: 92%

“…The block copolymers, investigated in this article, have the following chemical structure: POE is a model sample for studying the crystallisation of polymers because of its large crystal formations occurring in solution and melt [13,14]. The ability of this polymer to crystallise also as component of other block-copolymers has been recently reported [15]. It has been found that in this case the distortion of its monoclinic phase is due to the formation of crystal lamellae proceeding under stress [15].…”

Section: Introductionmentioning

confidence: 99%

AB Block-copolymers poly(oxyethylene)-blockpoly( dicyclohexyl itaconate): temperature dependence of the morphology

et al. 2004

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The paper deals with AB block-copolymers poly(oxyethylene)-blockpoly(dicyclohexyl itaconate) (POE/PDCHI) containing 2000 and 5000 g/mol of the flexible POE. The study aims at revealing the thermal effect on the copolymer morphology in the 20 -200°C range. Optical microscopy investigations were performed. The results confirm our previous X-ray studies. A liquid crystalline state is observed in the 90 -180°C range. It is characterized by birefringence and is determined by the chair-chair conformation, a dominating structure of the cyclohexyl rings. A condis-crystal state is observed at cooling in the interval 90°C to room temperature. It is characterised by a variety of cyclohexyl conformations and, therefore, by a lack of birefringence. The PEO component in the copolymer starts crystallising into small local spherulites at about room temperature. The results obtained allow the conclusion that the presence of PDCHI is a determining factor for the mesomorphic state of the copolymers discussed.

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Amphiphilic graft copolymers with poly(oxy ethylene) side chains: supermolecular structure in solid state

Cited by 35 publications

References 23 publications

Effect of NiO nanofiller concentration on the properties of PEO-NiO-LiClO4 composite polymer electrolyte

Effect of NiO nanofiller concentration on the properties of PEO-NiO-LiClO4 composite polymer electrolyte

Studies on PEO-based sodium ion conducting composite polymer films

AB Block-copolymers poly(oxyethylene)-blockpoly( dicyclohexyl itaconate): temperature dependence of the morphology

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