Effect of salt concentration on the properties of poly[oxymethylene–oligo(oxyethylene)]/Mg(ClO₄)₂polymer electrolytes

Poly[oxymethylene-oligo(oxyethylene)] for use in subambient temperature electrochromic devices

“…Compared to perfectly crystalline poly(oxyethylene) (Δ fus H ° = 160 J g −1 at −20 °C),15 the degree of crystallinity in annealed P200 was about 20 %, and in P200‐70 little more than 1 %. For the polymer electrolytes, the data in Table 2 show an increase in T g with increasing salt concentration (decreasing O:Li), as has been observed for other polymer/salt mixtures 1–4, 9, 11…”

“…Because conduction occurs through the amorphous polymer, crystallinity must be minimized for good conductivity to be achieved. One way of doing this is to incorporate crystallinity‐disrupting oxymethylene linkages into the polymer chain 5–14…”

“…Formation of a chloroether  OCH 2 CH 2 OH + CH 2 Cl 2 → OCH 2 CH 2 OCH 2 Cl is rapidly followed by reaction of the chloroether with a second hydroxy group to form an oxymethylene (acetal) link OCH 2 CH 2 OCH 2 Cl + HOCH 2 CH 2  → OCH 2 CH 2 OCH 2 OCH 2 CH 2  The difference in reactivities of the chloromethylene and chloroether groups is so great that high molar mass products can be obtained without the need to balance the concentrations of reagents, and DCM can be used as the solvent for the reaction. The crystalline melting point of the product decreases with decrease in the average oxyethylene sequence length n , which is determined by the starting PEG 5–14. The present work was concerned with applications at subambient temperatures, and so a short polyethylene glycol (PEG200, n ≈ 4.5) was employed.…”

Polyphosphazenes Bearing Branched and Linear Oligoethyleneoxy Side Groups as Solid Solvents for Ionic Conduction

“…3-tert-Butoxy-1,2-propanediol (17). Compound 17 was prepared by the method described by Montanari and Tundo.…”

Supramolecular organization of block oligomers based on rod-shaped mesogen into liquid crystalline assembly

“…Particularly, poly(alkylene oxide) as the coil block of rod-coil molecule has additional advantages due to its complexation capability with alkali metal cations, which can provide an application potential for solid polyelectrolytes with various supramolecular structures. 24,25 Control of the supramolecular structure in rod-coil molecular systems containing either PEO or PPO coils and induction of ordered structures are possible through selective complexation with lithium ions. For example, the complexes of 2 with 0.0-0.15 mol CF 3 SO 3 Li per ethylene oxide unit ([Li 1 ]/ [EO]) exhibit only a smectic A mesophase, while the complex with [Li 1 ]/[EO] ~0.20 shows an optical isotropic cubic phase in addition to a high-temperature smectic A phase.…”