Confined versus Unconfined Crystallization in Block Copolymer/Salt Mixtures Studied by Depolarized Light Scattering

Xiuhong Li, Whitney S. Loo, Xi Jiang, Xin Wang, Michael D. Galluzzo, Katrina I. Mongcopa, Andrew A. Wang, Nitash P. Balsara, Bruce Garetz

Research output: Contribution to journalArticle

Abstract

Crystallization in an ordered lamellar diblock copolymer/salt mixture, polystyrene-block-poly(ethylene oxide) mixed with lithium bis(trifluoromethanesulfonyl)imide salt (SEO/LiTFSI), has been studied using a combination of small-angle X-ray scattering (SAXS), transmission electron microscopy (TEM), and depolarized light scattering (DPLS). Such materials have applications as electrolyte membranes in solid-state lithium batteries. The grain structure of the electrolyte was controlled by manipulating thermal history. Poly(ethylene oxide) (PEO) crystallization was confined within the microphase-separated morphology and did not affect the grain structure in the case of shallow quenches. Deep quenches resulted in unconfined crystallization, where crystal formation does not affect the microphase-separated morphology but does alter the grain structure. The difference between the two modes of crystallization can only be detected by DPLS. This knowledge is particularly relevant for nanostructured electrolytes wherein ion transport is a strong function of grain structure.

Original languageEnglish (US)
JournalMacromolecules
DOIs
StateAccepted/In press - Jan 1 2019

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Crystal microstructure
Crystallization
Light scattering
Block copolymers
Salts
Polyethylene oxides
Electrolytes
Lithium batteries
Polystyrenes
X ray scattering
Lithium
Ions
Transmission electron microscopy
Membranes
Crystals

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Confined versus Unconfined Crystallization in Block Copolymer/Salt Mixtures Studied by Depolarized Light Scattering. / Li, Xiuhong; Loo, Whitney S.; Jiang, Xi; Wang, Xin; Galluzzo, Michael D.; Mongcopa, Katrina I.; Wang, Andrew A.; Balsara, Nitash P.; Garetz, Bruce.

In: Macromolecules, 01.01.2019.

Research output: Contribution to journalArticle

Li, Xiuhong ; Loo, Whitney S. ; Jiang, Xi ; Wang, Xin ; Galluzzo, Michael D. ; Mongcopa, Katrina I. ; Wang, Andrew A. ; Balsara, Nitash P. ; Garetz, Bruce. / Confined versus Unconfined Crystallization in Block Copolymer/Salt Mixtures Studied by Depolarized Light Scattering. In: Macromolecules. 2019.
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