Correlation among transport properties in ionically conducting cross-linked networks☆

Killis, A.; LeNest, Jean-François; Gandini, Alessandro; Cheradame, Hervé; Cohen‐Addad, J. P.

doi:10.1016/0167-2738(84)90104-8

Cited by 46 publications

(23 citation statements)

References 8 publications

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“…As it was shown by Killis et al [36,37], E, is proportional to f*, the critical free volume fraction, i.e. the volume necessary for the movements of the ions in the host polymer.…”

Section: Conductivitymentioning

confidence: 84%

Synthesis, Characterization and Ionic Conductivity of Poly[(oligoethylene oxide) ethoxysilane] and Poly[(oligoethylene oxide) ethoxysilane]/(EuCl3)0.67

Noto

Furlani

Lavina

1996

Polym. Adv. Technol.

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Poly[(oligoethylene oxide) ethoxysilane)] (I) and poly[(oligoethylene oxide) ethoxysilane)]/(EuCl3)0.67 (II) were synthesized by reacting tetraethoxysilane with oligo(ethylene glycol) of molecular weight 400 and oligo(ethylene glycol)400/(EuCl3)0.317, respectively. The products so obtained are very transparent and rubbery. By Fourier transform infrared and Raman spectroscopy studies and by using analytical results it was concluded that these products are crosslinked macromolecular materials where the Si atom is bonded to one OEt group and to three poly(ethylene oxide) 400 chains. Scanning electronic microscopy studies showed that the presence of EuCl3 in polymer host significantly affects the morphology of the material. Laser luminescence investigations on (II) showed that Eu3+ ion in the polymer host is accommodated in two different types of sites having a distorted C2v symmetry. Moreover, the ionic conductivity of these systems was investigated and the data were satisfactorily fitted by the empirical Vogel Tamman Fulcher equation. At 70°C the conductivities of (I) and (II) were 9 × 10−6 and 14.3 × 10−6 Ω−1 cm−1 respectively.

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“…As it was shown by Killis et al [36,37], E, is proportional to f*, the critical free volume fraction, i.e. the volume necessary for the movements of the ions in the host polymer.…”

Section: Conductivitymentioning

confidence: 84%

Synthesis, Characterization and Ionic Conductivity of Poly[(oligoethylene oxide) ethoxysilane] and Poly[(oligoethylene oxide) ethoxysilane]/(EuCl3)0.67

Noto

Furlani

Lavina

1996

Polym. Adv. Technol.

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“…Larger diffusants, such as inorganic ions, do not appreciably diffuse through glassy amorphous polymers, whereas diffusion does occur through amorphous polymers that have passed through their glass transition and are in a rubbery state [33][34][35]. This change in diffusion at the glass transition is linked to the increases in free volume and cooperative motion relaxations in the polymer as it changes from a glassy state to a rubbery one [36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Effects of Moisture on Diffusion in Unmodified Wood Cell Walls: A Phenomenological Polymer Science Approach

Jakes

Hunt

Zelinka

et al. 2019

Forests

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Despite the importance of cell wall diffusion to nearly all aspects of wood utilization, diffusion mechanisms and the detailed effects of moisture remain poorly understood. In this perspective, we introduce and employ approaches established in polymer science to develop a phenomenological framework for understanding the effects of moisture on diffusion in unmodified wood cell walls. The premise for applying this polymer-science-based approach to wood is that wood polymers (cellulose, hemicelluloses, and lignin) behave like typical solid polymers. Therefore, the movement of chemicals through wood cell walls is a diffusion process through a solid polymer, which is in contrast to previous assertions that transport of some chemicals occurs via aqueous pathways in the cell wall layers. Diffusion in polymers depends on the interrelations between free volume in the polymer matrix, molecular motions of the polymer, diffusant dimensions, and solubility of the diffusant in the polymer matrix. Because diffusion strongly depends on whether a polymer is in a rigid glassy state or soft rubbery state, it is important to understand glass transitions in the amorphous wood polymers. Through a review and analysis of available literature, we conclude that in wood both lignin and the amorphous polysaccharides very likely have glass transitions. After developing and presenting this polymer-science-based perspective of diffusion through unmodified wood cell walls, suggested directions for future research are discussed. A key consideration is that a large difference between diffusion through wood polymers and typical polymers is the high swelling pressures that can develop in unmodified wood cell walls. This pressure likely arises from the hierarchical structure of wood and should be taken into consideration in the development of predictive models for diffusion in unmodified wood cell walls.

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“…Numerous polyether-based crosslinked polymer electrolytes have been studied [9][10][11][12][13][14][15][16][17][18]. Simple strategies for crosslinking usually involve thermally activated reactions or UV irradiation [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Crosslinked perfluoropolyether solid electrolytes for lithium ion transport

et al. 2017

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A B S T R A C TPerfluoropolyethers (PFPE) are commercially available non-flammable short chain polymeric liquids. Endfunctionalized PFPE chains solvate lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt and these mixtures can be used as electrolytes for lithium (Li) batteries. Here we synthesize and characterize a new class of solid PFPE electrolytes. The electrolytes are made by either thermal or UV crosslinking PFPE chains with urethane methacrylate end-groups. For the synthesis of thermally crosslinked electrolytes, polyhedral oligomeric silsesquioxane (POSS) with organic acrylopropyl groups was used as crosslinker agent, while for UV cured electrolytes a photoinitiatior was used. We present thermal, morphological, and electrical data of the solid electrolytes. We compare these properties with those of the two parent liquids (PFPE with urethane methacrylate end-groups and POSS with acrylopropyl groups) mixed with LiTFSI. The solubility limit of LiTFSI in the PFPE-based solids is higher than that in the liquids. The conductivity data are analyzed using the Vogel-Tamman-Fulcher equation. The concentration of effective charge carriers is a strong function of the nature of the solvent (solid versus liquid) whereas the activation energy is neither a strong function of the nature of the solvent nor salt concentration.

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Correlation among transport properties in ionically conducting cross-linked networks☆

Cited by 46 publications

References 8 publications

Synthesis, Characterization and Ionic Conductivity of Poly[(oligoethylene oxide) ethoxysilane] and Poly[(oligoethylene oxide) ethoxysilane]/(EuCl3)0.67

Synthesis, Characterization and Ionic Conductivity of Poly[(oligoethylene oxide) ethoxysilane] and Poly[(oligoethylene oxide) ethoxysilane]/(EuCl3)0.67

Effects of Moisture on Diffusion in Unmodified Wood Cell Walls: A Phenomenological Polymer Science Approach

Crosslinked perfluoropolyether solid electrolytes for lithium ion transport

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