Effect of Polymerized Ionic Liquid Structure and Morphology on Shockwave Energy Dissipation

Abstract

The ability of nanosegregated polymerized ionic liquids (PILs) to dissipate shockwave energy is investigated for a series of imidazolium-based PILs with varying alkyl spacer length. The PILs are designed to have similar glass transition temperatures but different structures. X-ray scattering analysis reveals that each of the amorphous PILs exhibit distinct nanoscale structural heterogeneity, depending on the length of the chain spacer. We find that a higher structural heterogeneity, determined from the intensity of the intercluster scattering peak, in the PILs with longer alkyl spacers results in greater shockwave energy dissipation. In addition, we observe the crystalline phase is less effective at dissipating shockwave energy than the amorphous phase due to the close packed morphology and slow kinetics.

Poly(ionic liquid) Bridge Joining Smectic Lamellar Conducting Channels in Photoelectrochemical Devices as High-Performance Solid-State Electrolytes

“…The detailed procedure for PIL synthesis is shown in the Supporting Information (Figure S1), and the successful preparation of PIL was confirmed by 1 H NMR and FT-IR spectroscopy (Figure S2). As shown in Figure S2a, the peaks at 6.9, 7.1, and 7.4 ppm representing the protons at the imidazole moiety totally shifted to 7.8 ppm, standing for the protons at the imidazolium moiety in the 1 H NMR spectrum of PIL after in situ polycondensation, which confirmed the full polycondensation of the precursors for PIL …”

“…As shown in Figure S2a, the peaks at 6.9, 7.1, and 7.4 ppm representing the protons at the imidazole moiety totally shifted to 7.8 ppm, standing for the protons at the imidazolium moiety in the 1 H NMR spectrum of PIL after in situ polycondensation, which confirmed the full polycondensation of the precursors for PIL. 34 FT-IR measurements of the electrolytes were also performed to investigate the interaction between [C 14 Mim][I] and PIL in PIL-ILC a (Figure S2, Supporting Information). No new peak and no chemical band shift were observed in the FT-IR spectrum of PIL-ILC a by comparing with those of PIL and ILC a , which suggested that the molecular assembly of PIL and ILC a in PIL-ILC a was mainly based on physical interactions.…”

“…No peak was observed from T g to 100 °C for PIL, which indicated that PIL has a random morphology with an amorphous phase. 34 DSC measurements of the electrolytes PIL-ILC a were performed in absence of I 2 to avoid the potential corrosion. An endothermic peak at 18 °C was observed for PIL-ILC a (Figure 2a), indicating the appearance of a phase transition in the electrolyte.…”

“…All reactions were performed under dry N 2 atmosphere. 1-Tetradecyl-3-methylimidazolium iodide ([C 14 MIm]­[I]) and 1,10-bis­(imidazoyl)­decane were prepared according to procedures described previously. , An N719-sensitized TiO 2 photoanode and Pt counter electrode were prepared for DSSC fabrication as described in the literature . A TiO 2 electrode with an 8 μm 20-nm-sized TiO 2 particle layer and a 5 μm 400-nm-sized TiO 2 particle scatting layer screen printed on a fluorine-doped tin oxide (FTO) glass substrate was prepared, and then, the sintered electrode was immersed into N719 sensitizer solution (0.5 mM in ethanol) for 20 h to give the photoanode.…”

Molecular dynamics study of the shock response of polyurea

“…This mixing can also be inferred from the clear discrepancy in distance between the two carbon atoms bonded to terminal aromatic rings of a hard segment (≈ 3 nm) and the width of a hard domain ribbon. Furthermore, the experiments indicate that there is little or no crystallinity in polyurea [13,15], which likely helps to improve shock energy absorption [18].…”