Structural Investigation of Polyurethane Based Gel Polymer Electrolytes Using Small Angle X-ray Scattering (SAXS)

Kulkarni, Ajit R.; Balaji, R.; Srinivasa, R.S.

doi:10.1143/jpsjs.79sa.154

Cited by 5 publications

(3 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure a shows the room-temperature SAXS patterns of the PU- X copolymers as a function of TEMPO monomer concentration. The SAXS pattern of the PU-0 sample exhibits a broad hump, suggesting the presence of a very weak microphase separation, with a Bragg d -spacing of 27.5 nm. − As the TEMPO units are introduced (PU-5), the intensity of the diffraction peak increases, suggesting an enhancement of the microphase separation in this system. Additionally, a shift of the diffraction peak toward lower q values is observed, indicating a reduction of the Bragg d -spacing to 16.1 nm.…”

Section: Resultsmentioning

confidence: 99%

DNP NMR Studies of Crystalline Polymer Domains by Copolymerization with Nitroxide Radical Monomers

et al. 2018

View full text Add to dashboard Cite

Dynamic nuclear polarization (DNP) nuclear magnetic resonance (NMR) spectroscopy is increasingly recognized as a powerful and versatile tool for the characterization of polymers and polymer-based materials. DNP requires the presence of unpaired electrons, usually mono-or biradicals, and the method of incorporation of these groups and their distribution within the structure is crucial. Methods for covalently binding the radicals to the polymer and controlling their location (e.g., exclusively within a specific phase or at an interface) can allow the selective enhancement of a particular region or the measurement of domain sizes. We have prepared a series of polyurethanes by copolymerization of a nitroxide radical monomer with poly(ethylene glycol) (PEO) and diisocyanate linkers. The PEO is shown to form crystalline domains with the radical monomers in a separate phase, providing DNP enhancements of around 10 and allowing the domain size and morphology to be probed with the aid of X-ray scattering data. Additionally, electron paramagnetic resonance is used to estimate the inter-radical distances and density functional theory calculations are used to refine the PEO crystal structure.

show abstract

Section: Resultsmentioning

confidence: 99%

DNP NMR Studies of Crystalline Polymer Domains by Copolymerization with Nitroxide Radical Monomers

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The polymer host was doped with PC as plasticizer. At room temperature, the maximum conductivity of the PU–PC(60 wt%) gel electrolyte is 2.53 × 10 −3 S cm −1 79 …”

Section: Approachesmentioning

confidence: 99%

Polyurethane‐based polymer electrolyte for lithium ion batteries: a review

Misenan

Khiar

Eren

2022

Polymer International

View full text Add to dashboard Cite

For the past decade, lithium ion batteries have dominated the high‐performance and mobile markets. Despite their domination in many sectors, the development of contemporary commercial lithium ion batteries is hampered by safety concerns such as leakage, burning and even explosions caused by organic liquid electrolytes with low boiling points. Polymer electrolytes are a promising option to solve or mitigate these issues. Polymer electrolytes have the advantages of low flammability, good flexibility, excellent thermal stability and high safety. Among others, polyurethane (PU) has attracted attention as a promising polymer electrolyte candidate for the future. The soft and hard segments of the polymeric chain given by polyols and isocyanates, respectively, give PU its characteristic multiphase structure. The PU's soft segment can operate as a polymeric solvent to solvate the cations, while the hard segment can be functionalized to retain a wider range of electrochemical stability, allowing the construction of polymer electrolytes in electrochemical devices. Numerous researchers have concentrated on developing high‐performance PU‐based polymer lithium ion batteries. Nonetheless, low lithium ion conductivity characteristics remain the most significant obstacles to its commercialization. In order to tackle the issues and improve the overall performance, both physical and chemical modifications are widely investigated to form a PU‐based polymer electrolyte. In the light of this work, this review discusses PU as a polymer host and the approaches to increase its ionic conductivity, including polymer blending, copolymerization, crosslinking, filler addition, plasticization, salt dopant addition as well as the integration of PUs into polymeric ionic liquids. In this review, previous work regarding PU‐based polymer electrolytes from 1988 to 2021 is discussed and summarized. © 2022 Society of Industrial Chemistry.

show abstract

“…The bulk of the characterization and drug delivery studies have been on Soluplus ® in the solid state, while studies on the solution properties have been much more scarce. Small angle x-ray scattering (SAXS) is a powerful tool in elucidating the nanoscale structures of dynamic soft materials, which can provide insight into their physical properties [22,23]. In collaboration with the Department of Energy and Brookhaven National Lab, SAXS studies at the NSLS-II allowed for a highly detailed analysis into this material.…”

Section: Introductionmentioning

confidence: 99%

In situ saxs characterization of thermoresponsive behavior of a poly(ethylene glycol)-graft-(poly(vinyl caprolactam)-co-poly(vinyl acetate)) amphiphilic graft copolymer

Kennedy¹,

Zhang

Bhatia

2023

Nanotechnology

View full text Add to dashboard Cite

We report the thermoresponsive assembly and rheology of an amphiphilic thermosensitive graft copolymer, poly(ethylene glycol)-graft-(poly(vinyl caprolactam)-co-poly(vinyl acetate)) (commercial name Soluplus®), which has been investigated for potential biomedical applications. It has received attention due to is ability to solubilize hydrophobic drugs and for its thickening behavior close to body temperature. Through use of the synchrotron at Brookhaven National Lab, and collaboration with the department of energy, the nanoscale structure and properties can be probed in greater detail. Soluplus® undergoes two structural changes as temperature is increased; the first, a concentration independent change where samples become turbid at 32 °C. Increasing the temperature further causes the formation of physically associated hydrogels. This sol-gel transition is concentration dependent and occurs at 32 °C for 40 wt% samples, and increases to 42 °C for 10 wt% samples. From variable temperature SAXS characterization micelles of 20-25nm in radius can be seen and maintain their size and packing below 32 °C. A gradual increase in the aggregation of micelles corresponding to a thickening of the material is also observed. Close to and above the gelation temperature, micelles collapse and form a physically associated 3-D network. A model is proposed to explain these physical effects, where the poly(vinyl caprolactam) group transitions from the hydrophilic corona at room temperature to the hydrophobic core as temperature is increased.

show abstract

Structural Investigation of Polyurethane Based Gel Polymer Electrolytes Using Small Angle X-ray Scattering (SAXS)

Cited by 5 publications

References 12 publications

DNP NMR Studies of Crystalline Polymer Domains by Copolymerization with Nitroxide Radical Monomers

DNP NMR Studies of Crystalline Polymer Domains by Copolymerization with Nitroxide Radical Monomers

Polyurethane‐based polymer electrolyte for lithium ion batteries: a review

In situ saxs characterization of thermoresponsive behavior of a poly(ethylene glycol)-graft-(poly(vinyl caprolactam)-co-poly(vinyl acetate)) amphiphilic graft copolymer

Contact Info

Product

Resources

About