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 A.

doi:10.1021/acs.macromol.8b02142

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

Journal Article · Tue Jan 22 23:00:00 EST 2019 · Macromolecules

DOI:https://doi.org/10.1021/acs.macromol.8b02142· OSTI ID:1594908

Li, Xiuhong ^[1]; ^[2]; ^[3]; Wang, Xin ^[1]; Galluzzo, Michael D. ^[4]; ^[2]; Wang, Andrew A. ^[2]; ^[4]; ^[1]

New York Univ. (NYU), NY (United States)
Univ. of California, Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

In this work, 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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division

Grant/Contract Number:: AC02-05CH11231; AC02-76SF00515

OSTI ID:: 1594908

Journal Information:: Macromolecules, Journal Name: Macromolecules Journal Issue: 3 Vol. 52; ISSN 0024-9297

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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

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