A series of poly(vinyl alcohol-co-vinyl acetal) gel electrolytes was synthesized, characterized and assessed as electrode separators in alkaline water electrolysis. The copolymers were prepared by reacting alcohol) with benzaldehyde or 4-formylbenzoic acid under acidic conditions at different ratios, visually homogenous water-insoluble membranes subsequently obtained solution casting. physicochemical characteristics terms electrolyte uptake, swelling behavior, ion conductivity could be tuned...

Alkaline ion-solvating polymer electrolyte membranes derived from poly(isatin biphenyl) and polybenzimidazole (m-PBI) blends with different ratios were prepared, characterized, evaluated as electrode separators in alkaline water electrolysis. The physicochemical properties could be tuned by varying the composition of blend, membrane a content 25% showed suitable balance between conductivity mechanical robustness. polarization behavior was comparable to that state-of-the-art separators,...

Enantioselective electrophilic aromatic nitration methodology is needed to advance chirality-assisted synthesis (CAS). Reported here an enantioselective strategy operating with chiral diester auxiliaries, and it provides of a C3v -symmetric tribenzotriquinacene (TBTQ). These axially-chiral structures are much sought-after building blocks for CAS, but they were not accessible prior this work in enantioenriched form without resolution enantiomers. This controls the stereochemistry threefold...

Selective monofunctionalization of substrates with distant, yet equally reactive functional groups is difficult to achieve, as it requires the second group selectively modulate its reactivity once first has reacted. We now show that mechanically interlocked catalytic rings can effectively regulate stoppering in rotaxanes over a distance about 2 nm. Our mechanism communication enabled by unique design, which removes from fast dethreading soon reaction taken place. method not only led rare...

A new class of ion-solvating membranes based on a tetrazole functionalized vinyl copolymer is introduced. The are prepared from poly(styrene-co-acrylonitrile), by converting the acrylonitrile groups to pendants in one-step click-type [3+2] cycloaddition reaction, and content controlled adjusting starting material. Due weak acidity pendants, nearly complete ionization corresponding tetrazolides occurs when equilibrated aqueous KOH. Model system studies DFT simulations show that this...

Abstract Crystal‐packing forces can have a significant impact on the relative stabilities of different molecules and their conformations. The magnitude such effects is, however, not yet well understood. Herein we show, that crystal packing completely overrule stereoisomers in solution. Heating atropoisomers (i.e. “frozen‐out” conformational isomers) solution leads to complex mixtures. In contrast, solid‐state heating selectively amplifies minor (<25 mole %) components these solution‐phase...

Abstract Enantioselective electrophilic aromatic nitration methodology is needed to advance chirality‐assisted synthesis (CAS). Reported here an enantioselective strategy operating with chiral diester auxiliaries, and it provides of a C 3 v ‐symmetric tribenzotriquinacene (TBTQ). These axially‐chiral structures are much sought‐after building blocks for CAS, but they were not accessible prior this work in enantioenriched form without resolution enantiomers. This controls the stereochemistry...

Abstract Crystal‐packing forces can have a significant impact on the relative stabilities of different molecules and their conformations. The magnitude such effects is, however, not yet well understood. Herein we show, that crystal packing completely overrule stereoisomers in solution. Heating atropoisomers (i.e. “frozen‐out” conformational isomers) solution leads to complex mixtures. In contrast, solid‐state heating selectively amplifies minor (<25 mole %) components these solution‐phase...

Replacing commercial hardeners with bio-sourced fatty acids linked by hetero Diels–Alder (HDA) motifs enabled epoxy-amine coatings intrinsic self-healing properties. The HDA-based demonstrate scratch healing at 95 °C within 15 min.

Abstract Alkaline ion‐solvating membranes derived from a tetrazole functionalized poly(arylene alkylene) are prepared, characterized and evaluated as electrode separators in alkaline water electrolysis. The base polymer, poly[[1,1′‐biphenyl]‐4,4′‐diyl(1,1,1‐trifluoropropan‐2‐yl)], is synthesized by superacid catalyzed polyhydroxyalkylation subsequently with pendants. After equilibration aqueous KOH, the relatively acidic pendants deprotonated to form corresponding potassium tetrazolides....

Polymeric ion-solvating membranes 1 derived from poly(arylene alkylene)s 2 have emerged as promising candidates for alkaline water electrolysis, offering a PFAS-free, robust, and chemically stable alternative. This work focuses on the development of such membrane with an emphasis high resistance to gas crossover, addressing challenges associated conventional ion-exchange materials. The polymer presented in this study demonstrated very good performance electrolysis. At 80 degrees Celsius,...

Alkaline ion-solvating membranes, such as those based on polybenzimidazole (PBI), offer high ion conductivity and good gas barrier properties, making them promising for next-generation alkaline water electrolyzers. 1 However, the stability of commonly used PBI derivatives is limited due to gradual backbone degradation. Consequently, alternative chemistries other polymer options like poly(vinyl alcohol), 2 carboxylate functionalized styrene-ethylene-butylene copolymers are being explored...

Many novel lab-scale diaphragms, as well commercial state-of-the-art diaphragms for alkaline water electrolysis are prepared by non-solvent based phase inversion processes. On the lab-scale, fabrication process is often asymmetric. The polymer dope coated onto a glass plate similar to conventional film forming techniques, after which substrate carrying immersed into bath rapidly precipitate constituting polymer. As initially only exposed on top surface, resulting pore structure at surface of...

Ion-solvating membranes constitute an alternative to both porous diaphragms and anion-exchange for alkaline electrolysis. [1,2] The underlying principle is imbibe a nonporous hydrophilic membrane with concentrated aqueous KOH thus obtain high ionic conductivity from the sorbed electrolyte. It well-established that can be reached, [3] main challenge identify or develop polymers right affinity long-term stability in aggressive environment. Polymers known their are generally hydrophobic will...

Tetrazole functionalization is described as a new strategy toward synthesis of stable and high-performing quaternary ammonium-free alkaline ion-solvating membranes for water electrolysis.

A series of poly(vinyl alcohol-co-vinyl acetal) gel electrolytes was synthesized, characterized and assessed as electrode separators in alkaline water electrolysis. The copolymers were prepared by reacting alcohol) with benzaldehyde or 4-formylbenzoic acid under acidic conditions at different ratios, visually homogenous water-insoluble membranes subsequently obtained solution casting. physicochemical characteristics terms electrolyte uptake, swelling behavior, ion conductivity could be tuned...

Abstract Selective monofunctionalization of substrates with distant, yet equally reactive functional groups is difficult to achieve, as it requires the second group selectively modulate its reactivity once first has reacted. We now show that mechanically interlocked catalytic rings can effectively regulate stoppering in rotaxanes over a distance about 2 nm. Our mechanism communication enabled by unique design, which removes from fast dethreading soon reaction taken place. method not only led...

Abstract A better understanding of polymer degradation and post‐degradation processes are essential for the development novel degradable polymers. Herein, we present synthesis a new aliphatic azo‐containing polyurethane its behavior toward external stimuli like heat UV light. relatively stable radical forming azo‐monomer in current is readily undergoing thermal degradation, whereas azo‐group less susceptible to optical degradation. comparison stimuli‐responsive properties azo‐polymer with...

Alkaline ion-solvating polymer electrolyte membranes derived from poly(isatin biphenyl) and polybenzimidazole (m-PBI) blends with different ratios were prepared, characterized, evaluated as electrode separators in alkaline water electrolysis. The physicochemical properties could be tuned by varying the composition of blend, membrane a content 25% showed suitable balance between conductivity mechanical robustness. polarization behavior was comparable to that state-of-the-art separators,...