Polyurethanes Containing an Imidazolium Diol‐Based Ionic‐Liquid Chain Extender for Incorporation of Ionic‐Liquid Electrolytes

Abstract

Novel polyurethane (PU) cationomers are synthesized using an imidazolium diol‐based ionic liquid (IL) chain extender. A systematic comparison with a non‐ionic PU analogue reveals effect of the imidazolium cation on physical properties, hydrogen bonding, and morphology of segmented PU. Casting resulting PU solutions with various contents of IL generates novel membranes. Thermal study reveals that IL‐containing PU membranes exhibit a constant soft segment Tg at −81 °C; however, the Tg of imidazolium hard segments systematically shifts to lower temperatures with increasing IL content. This suggests that IL preferentially locates into the imidazolium ionic hard domains, which is also evident in small‐angle X‐ray scattering. Moreover, dielectric relaxation spectroscopy demonstrates increased ionic conductivity of PU membranes by 5 orders of magnitude upon incorporation of 30 wt% IL.

Antimicrobial polyurethane foams having cationic ammonium groups

“…Thus, new signals around 3.7-3.8 and 4.1 ppm are observed corresponding to the methylene protons of the tetraol monomer. Similarly, FTIR signal associated with the OH stretching were observed between 3200 and 3500 cm 21 . In addition, …”

“…FTIR spectrum of the final foam is provided in Figure 1. Polyurethane formation can be easily verified by the disappearance of the isocyanate stretching at 2258 cm 21 . After the reaction, new bands corresponding to the carbonyl stretching signals associated with the urethane and urea groups are observed between 1686 and 1340 cm 21 .…”

“…Polyurethane formation can be easily verified by the disappearance of the isocyanate stretching at 2258 cm 21 . After the reaction, new bands corresponding to the carbonyl stretching signals associated with the urethane and urea groups are observed between 1686 and 1340 cm 21 . The carbon-nitrogen and carbon-oxygen stretching bands were also observed around 1090 cm 21 .…”

“…After the reaction, new bands corresponding to the carbonyl stretching signals associated with the urethane and urea groups are observed between 1686 and 1340 cm 21 . The carbon-nitrogen and carbon-oxygen stretching bands were also observed around 1090 cm 21 . Furthermore, the ammonium groups could be identified in the spectra of the foam by the bands at 1500 cm 21 .…”

“…prepared. 2,21 Some of these polyurethanes have showed excellent capacity to kill a broad range of bacteria. 22 In this work, we show a simple and straightforward strategy to chemically incorporate antimicrobial active quaternary ammonium groups into the polyurethane foams.…”