Slow recrystallization in the polymer electrolyte system poly(ethylene oxide)n–LiN(CF3SO2)2

2000 ◽  
Vol 15 (9) ◽  
pp. 1950-1954 ◽  
Author(s):  
Ludvig Edman ◽  
Anders Ferry ◽  
Marca M. Doeff
Keyword(s):  
Ionic Conductivity ◽  
Ethylene Oxide ◽  
Polymer System ◽  
Electrolyte System ◽  
Slow Kinetics ◽  
History Of ◽  
Poly Ethylene Oxide ◽  
Melting Transitions ◽  
Poly Ethylene ◽  
Kinetics Of

Thermal and ion-transport properties of the salt-in-polymer system poly(ethylene oxide)n–LiN(CF3SO2)2 [P(EO)nLiTFSI] were investigated for compositions ranging from n = 5 to n = 50. Particular attention was paid to the region n = 8 to 10 where a crystallinity gap previously had been reported. We concluded that the absence of distinct melting transitions for salt-rich compositions (n = 5 to 12) was attributable to the extremely slow kinetics of recrystallization of this system following a heat treatment. The results further indicated that it was primarily the nucleation process that was inhibited by the [(bis)trifluoromethanesulfonate imide] (TFSI) anion. As a corollary, the ionic conductivity was strongly dependent on the thermal history of samples, and an enhancement of up to 300% was observed in the ambient temperature ionic conductivity for pre-heated salt-rich samples.

scholarly journals Isothermal Crystallization Kinetics of Poly(ethylene oxide)/Poly(ethylene glycol)-g-silica Nanocomposites

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 648
Author(s):  
Xiangning Wen ◽  
Yunlan Su ◽  
Shaofan Li ◽  
Weilong Ju ◽  
Dujin Wang
Keyword(s):  
Molecular Weight ◽  
Ethylene Oxide ◽  
Crystallization Kinetics ◽  
Isothermal Crystallization ◽  
Crystallization Rate ◽  
Poly Ethylene Glycol ◽  
Isothermal Crystallization Kinetics ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Kinetics Of

In this work, the crystallization kinetics of poly(ethylene oxide) (PEO) matrix included with poly(ethylene glycol) (PEG) grafted silica (PEG-g-SiO2) nanoparticles and bare SiO2 were systematically investigated by differential scanning calorimetry (DSC) and polarized light optical microscopy (PLOM) method. PEG-g-SiO2 can significantly increase the crystallinity and crystallization temperature of PEO matrix under the non-isothermal crystallization process. Pronounced effects of PEG-g-SiO2 on the crystalline morphology and crystallization rate of PEO were further characterized by employing spherulitic morphological observation and isothermal crystallization kinetics analysis. In contrast to the bare SiO2, PEG-g-SiO2 can be well dispersed in PEO matrix at low P/N (P: Molecular weight of matrix chains, N: Molecular weight of grafted chains), which is a key factor to enhance the primary nucleation rate. In particular, we found that the addition of PEG-g-SiO2 slows the spherulitic growth fronts compared to the neat PEO. It is speculated that the interfacial structure of the grafted PEG plays a key role in the formation of nuclei sites, thus ultimately determines the crystallization behavior of PEO PNCs and enhances the overall crystallization rate of the PEO nanocomposites.

Physical Gels Based on Polyrotaxanes: Kinetics of the Gelation, and Relative Contributions of α-Cyclodextrin and Poly(ethylene oxide) to the Gel Cohesion

2010 ◽  
Vol 291-292 (1) ◽  
pp. 202-211 ◽  
Author(s):  
Christophe Travelet ◽  
Guy Schlatter ◽  
Pascal Hébraud ◽  
Cyril Brochon ◽  
Denis V. Anokhin ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Kinetics Of

Ionic Conductivity and NMR Self-Diffusion in Poly(macromonomer)s of Vinylbenzyl Poly(ethylene oxide)s

2001 ◽  
Vol 30 (6) ◽  
pp. 490-491 ◽  
Author(s):  
Yasuhisa Tsukahara ◽  
Kazuhiko Hashimoto ◽  
Kyoji Kaeriyama ◽  
Arei Niwa ◽  
Mary Anne Mehta ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Ethylene Oxide ◽  
Self Diffusion ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene
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