Ionic conductivity probed in main chain liquid crystalline azobenzene polyesters

Nardele, Chinmay G.; Dhavale, Vishal M.; Sreekumar, K.; Asha, S. K.

doi:10.1002/pola.27484

Cited by 12 publications

(6 citation statements)

References 52 publications

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“…Many of these investigations have focused on synthesis, conductivity, or ion transport. , Polymer electrolytes can be produced by dissolving polymer and salt and then evaporating the solvent. Selected examples include poly(ethylene oxide)/poly(vinyl chloride) blends, poly(vinylidene fluoride)/poly(vinyl alcohol) blends, polycarbonates, − polyesters, − and cellulose …”

Section: Introductionmentioning

confidence: 99%

Synthetic Design of Polyester Electrolytes Guided by Hydrophobicity Calculations

et al. 2016

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Partition coefficients (LogP) help to quantify hydrophobicity, which can be used to guide the design of polymer electrolytes with targeted properties. Thus, this study combined synthetic experiments and molecular modeling to produce polyester electrolytes that solubilize lithium salts. These polyester electrolytes were derived from natural sources and polymerized with different ratios of polyols (diglycerol, glycerol, and diethylene glycol) and citric acid in the presence of lithium salts (LiTf and LiTFSI). The Fisher esterification produced homogeneous, cross-linked films with high optical transparency, whereas the lithium salts increased glass transition temperatures. The LogP values of monomers and the resulting polyesters were predicted using cheminformatics tools and indicate changing diglycerol to glycerol or diethylene glycol alters the hydrophobicity. Comparison of different molecular modeling methods with predicted LogP values demonstrate that LogP values are a reliable means of tailoring physical and chemical properties of these polymer electrolytes. Additionally, LogP values greatly benefit from being extremely less expensive from a computational standpoint as well as more convenient for calculating precursory quantitative information.

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Section: Introductionmentioning

confidence: 99%

Synthetic Design of Polyester Electrolytes Guided by Hydrophobicity Calculations

et al. 2016

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“…Similarly, controlling materials properties at the molecular level through, for instance, control or minimization of defect presence could improve the efficiency of "switchable" devices. In addition, systematic investigations focused on tuning geometrical parameters (e.g., angles and distances between [161,162] photoresponsive units, i.e., dipole alignment) could result in the development of high-performance devices with dynamically controlled electronic properties. Thus, exploring material dimensionality and photoswitch connectivity could result in a material with adaptive electronic behavior that will significantly modify the current energetical and technological sectors.…”

Section: Discussionmentioning

confidence: 99%

“…Photoresponsive molecules with two sites of connection ( c = 2) integrated inside polymers. [ 161,162 ] …”

Section: Integration Of Photochromic Units With Two Points Of Connect...mentioning

confidence: 99%

“…In an approach to tune ionic conductivity by integrating photochromic molecules into the polymer backbone, Asha and co‐workers utilized a monomer, P4DTEG (P4DTEG = dimethyl 4,4′‐((1 E ,1′ E )‐(((((oxybis(ethane‐2,1‐diyl))bis(oxy))bis(ethane‐2,1‐diyl))bis(oxy))bis(4,1‐phenylene))bis(diazene‐2,1‐diyl))dibenzoate) to form polyP4P(TEG) ( c = 2; Figure 28) that was crystalline in nature. [ 162 ] An almost 90% conversion of trans ‐to‐ cis isomerization occurred within 60 s of UV‐irradiation, while an 80% recovery from cis ‐to‐ trans isomer occurred upon irradiation with 450‐nm light in about 80 s. Based on viscosity and its glass transition temperature, polyP4P(TEG) was selected for ionic conductivity studies, and a thin polymer electrolyte film was prepared by incorporating lithium trifluoromethanesulfonate (LiCF 3 SO 3 ) into the polymer prior to its analysis with impedance spectroscopy. Composite polymer films containing 0.3 mol of Li were amorphous and exhibited an ionic conductivity in the range of 1.8 × 10 −5 S cm −1 at 25 °C, which increased up to 2.4 × 10 −5 S cm −1 upon UV‐irradiation (λ ex = 360 nm).…”

Section: Integration Of Photochromic Units With Two Points Of Connect...mentioning

confidence: 99%

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Dynamically Controlled Electronic Behavior of Stimuli‐Responsive Materials: Exploring Dimensionality and Connectivity

Leith

Martin

Mathur

et al. 2021

Advanced Energy Materials

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Materials with dynamically controlled electronic structures (i.e., upon external stimuli) are at the forefront of the renewable energy sector with applications as memory devices, smart supercapacitors, programmable solar cells, and field‐effect transistors. Moreover, their continued development as device components is critical for the field of optoelectronics since their performance is comparable, or could even surpass, the current benchmarks. Adaptive electronic properties are the main focus of this review that discusses recent developments in the modulation of electronic behavior that can be tuned using external stimuli in metal–organic frameworks (MOFs), covalent–organic frameworks (COFs), primarily inorganic hybrids, polymers, and graphitic‐type materials. Triggers to achieve “dynamic” behavior discussed within this manuscript are primarily light‐based switches that include different classes of photochromic molecules such as naphthalene diimide, viologen, diarylethene, azobenzene, and spiropyran. The effect of material dimensionality and photoswitch connectivity achieved through integration of photochromic moieties inside 0D, 1D, 2D, and 3D hybrid matrices is discussed. This review showcases the prospects of advancing the material and energy landscapes through employment of structural motifs with adaptive electronic structures occurring as a function of their dimensionality and connectivity.

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“…However, photoresponsive nanoporous LC materials have only been rarely reported. Gas permeation LC membranes have been prepared which can switch between an impermeable ordered state and a permeable disordered state while azobenzene containing smectic LCs have been used to induce anisotropic ion conduction and photoswitchable ion conduction . Lyotropic azobenzene containing LC assemblies with switchable nanopores have also been reported …”

Section: Introductionmentioning

confidence: 99%

Photoresponsive Nanoporous Smectic Liquid Crystalline Polymer Networks: Changing the Number of Binding Sites and Pore Dimensions in Polymer Adsorbents by Light

et al. 2015

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Photoresponsive nanoporous polymer films have been fabricated by adding a photoresponsive azobenzene cross-linker to a hydrogen-bonded smectic liquid crystalline polymer network. A base treatment resulted in the nanoporous material which has been fully characterized. Upon exposure to UV light a decrease in the smectic layer spacing is observed, suggesting a decrease in pore size. In addition, the binding sites in the material could be changed with light, leading to light-induced adsorption of cations and cationic dyes. Finally, light could also be used to create nanoporous channels in the polymer film.

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Ionic conductivity probed in main chain liquid crystalline azobenzene polyesters

Cited by 12 publications

References 52 publications

Synthetic Design of Polyester Electrolytes Guided by Hydrophobicity Calculations

Synthetic Design of Polyester Electrolytes Guided by Hydrophobicity Calculations

Dynamically Controlled Electronic Behavior of Stimuli‐Responsive Materials: Exploring Dimensionality and Connectivity

Photoresponsive Nanoporous Smectic Liquid Crystalline Polymer Networks: Changing the Number of Binding Sites and Pore Dimensions in Polymer Adsorbents by Light

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