ISSN:1042-7147    

DOI:10.1002/pat.1993.220040201

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY

ISSN:1042-7147    

DOI:10.1002/pat.1993.220040202

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractIonic conductivities of complexes of polystyrene derivatives having a spacer, CH2O(CH2CH2O)n (poly‐(SEDEP), n = 1; poly(SDEDEP), n = 2), between backbone and pendant penta(methoxyethoxyethoxy)cyclotriphosphazene with LiClO4were investigated as functions of temperature and salt concentration. The glass transition of temperature of poly(SEDEP) and poly(SDEDEP) was observed at −64 and −65°C, respectively. The extent of Tgelevation of the Li+–polymer complexes was not affected by the difference of spacer in the host polymers. The conductivities of the complexes exhibit non‐Arrhenius temperature dependence. The conductivities of poly(SDEDEP)–Li+complexes were somewhat higher than those of poly(SEDEP) systems and the maximum value close to 10−4S/cm at 50°C has been achieved at [Li+]/O = 0.08. The results are compared with those obtained previously for the complexes based on polymers which have the similar structures but no spacer, and the correlation between the conduction mechanism and polymer character

ISSN:1042-7147    

DOI:10.1002/pat.1993.220040203

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractGraft copolymers were synthesized by means of hydrosilylation from poly[hydromethylsiloxane)‐co‐dimethylsiloxane)] and allylether of poly(ethylene oxide)‐co‐(propyleneoxide)](poly(EO‐CO‐PO)). Network polymer electrolyte complexes were made from the graft copolymers and alkali metal salt by solvent‐casting from acetone and the tetraethyl orthosilicate crosslinking method. The influence of composition of the polyether side chains, and the species and concentration of inorganic salts on the ionic conductivity were investigated. The temperature dependence of the ionic conductivity of the network film was also studied. It is shown that the complexes of the network polymers with alkali metal salt exhibit a very high ionic conductivity of about 5 × 10−5S/cm at 25°C and have the characteristic of a typical noncrystalline

ISSN:1042-7147    

DOI:10.1002/pat.1993.220040204

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractNetwork polymer electrolytes based on poly[2‐(2‐methoxyethoxy)ethyl glycidyl ether] (PME2GE) were synthesized and characterized. The effects of crosslinking density, the introduction of ethylene oxide (EO) unit into the main chain by copolymerization, and the electrolyte (LiClO4) concentration on the ionic conductivity were explored. The random copolymer system improved the conductivity considerably compared with the polymer electrolytes previously obtained for network polymer systems and exhibited a high ionic conductivity of 10−4S/cm at 40°C and 10−5S/cm at 10°C, and even 3 X 10−7S/cm at −20°C with optimization of the copolymer composition, the crosslinking density and the amount of LiClO4. The optimum composition was EO/ME2GE = 70/30 in molar ratio. The most preferable ratio of LiClO4to etheric oxygen was in the rang

ISSN:1042-7147    

DOI:10.1002/pat.1993.220040205

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractA brief review is given of the fundamental features determining the behavior of amorphous polyethylene oxide‐based networks as polymer electrolytes containing ionic moieties in terms of two basic issues affecting the ultimate optimum ionic conductivity, viz. the factors determining the extent of ionic dissociation and those influencing the ionic mobility. These generalizations deduced from previous studies on a variety of systems allowed the elaboration of a new family of structures based on polysaccharides crosslinked with polyethylene oxide and grafted with polyether chains. The preliminary results dscribed in this paper are promising in view of the application of these materials in solid‐state batteries because of their good electrochemical properties combined with mechanical strength and film‐forming apt

ISSN:1042-7147    

DOI:10.1002/pat.1993.220040206

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractA new proton‐conducting polymer electrolyte—poly‐(benzylsulfonic acid)siloxane (PBSS)—has been prepared by sol–gel process. Both the hydrolysis and the condensation reactions of triethoxybenzylsilane have been studied under different catalysis conditions. The basic material—polybenzylsiloxane (PBS)—is always soluble, no matter what the experimental conditions, reaching an average molecular weight—Mw—of 20,000 and a polydispersity index close to 5. Good yields of a water‐soluble polyelectrolyte—PBSS–thermally stable up to 300°C in air according to thermogravimetric analysis (TGA), and for which the exchange capacity is close to 4.4, can be obtained by sulfonation of PBS. Conductivities ranging from 2 × 10−3to 10−2S/cm at room temperature have been determined by a.c. impedance spectroscopy. These high conductivities, as well as the tensile strength of the PBSS, allow its use in se

ISSN:1042-7147    

DOI:10.1002/pat.1993.220040207

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractIonic conductors based on N‐substituted oligo(ethylene oxide) poly(p‐phenylene terephthalamide) (PPTA) were investigated. Two different PPTAs (Mv= 12,000 and 3600) were grafted with tri(ethylene oxide) and hexa(ethylene oxide). These modified PPTAs were found to be soluble in organic solvents such as dimethyl acetamide and dimethyl sulfoxide and were miscible with various concentrations of oligo(ethylene oxide). The resulting blends formed complexes with lithium trifluoromethanesulfonate (LiSO3CF3). The thermal and ionic conductive properties of the blends were investigated. The conductivities of some of the blends were in the range of 0.5–5.0 × 10−5S/cm at 25°C and 0.5–5.0 × 10−4S/cm at 100°C. The profile of conductivity at various temperatures followed the Vogel–Tammann–Fulcher (VTF) plots and it suggested that the major ionic transport took place in

ISSN:1042-7147    

DOI:10.1002/pat.1993.220040208

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractRedox‐active poly(xylyl viologen) (PXV) was cast on a glassy carbon electrode and soaked into poly(ethylene oxide) (PEO) oligomers containing different supporting electrolytes. The obtained peak current was the function of the anion radius of the supporting electrolytes in PEO No cation dependence was observed. Anions migrated in the PXV matrix during the redox reaction and smaller anions gave a larger peak current, reflecting faster migration in the PXV matrix. However, when PXV was mixed with poly(styrene sulfonate) (PSS) on the carbon electrode to form a PXV–PSS complex, a similar voltammetric study revealed that only cations migrated in the PXV–PSS matrix during the redox reaction. Smaller cations gave larger peak currents for the PXV–PSS complex‐coated electrode in PEO oligomers. The ion radius dependence of the peak current in the PXV–PSS complex was smaller than that in the PXV system. This suggested that the PXV–PSS complex domain was polar but considerably smaller in the

ISSN:1042-7147    

DOI:10.1002/pat.1993.220040209

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractPhotoresponse in ionic conductivity has been realized in the solid polymer electrolytes, consisting of poly[(ω‐hydroxy) oligo(oxyethylene) methacrylate] [P(MEO)OH]or poly[(MEO)OH‐co‐butyl methacrylate] (PBMA), spiropyran derivative (SP) and LiClO4. SP showed reversible isomerization upon photoirradiation in these films. The ionic conductivity in these films decreased upon ultraviolet light (UV) irradiation and subsequently increased upon visible light (Vis) irradiation. The interaction between photoisomerized merocyanine form (PMC form) and the hydroxyl group on the polymer side chain was confirmed by an IR shift assignable to OH stretching vibration. From DSC thermograms, the change of ionic conductivity was revealed to be considerably affected by this interaction and attributed to reversible photoisomerization of SP. Reversibility of ionic conductivity was improved in copolymer P[(MEO)OH‐co‐BMA] in comparison with that

ISSN:1042-7147    

DOI:10.1002/pat.1993.220040210

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY