期刊
MACROMOLECULES
卷 -, 期 -, 页码 -出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.2c01267
关键词
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资金
- U.S. National Science Foundation [DMR-1801993, CHE-1807330]
- NSF [00039202]
- NSF
- E.I. DuPont de Nemours Co.
- Dow Chemical Company [00039202, DMR-2011401]
- Northwestern University
- U.S. DOE
- National Science Foundation
- [DE-AC02-06CH11357]
- [NSF CHE-1336940]
This study reports the sensitivity of diblock copolymer particle packing symmetry to the ratio alpha and reveals the rich phase behavior as a function of alpha, overall particle core volume fraction, and temperature.
We report the sensitivity of diblock copolymer particle packing symmetry to the ratio alpha = N-homo/N-core, where N-homo and N-core are the respective homopolymer and core-block degrees of polymerization. Three poly(ethylene oxide)-b-poly(2-ethyllhexyl acrylate) (OA) diblock copolymers with O volume fractions f(O) = 0.15, 0.16, and 0.20 were blended with O homopolymers characterized by alpha = 0.23, 0.42, 0.80, and 1.00. Small-angle X-ray scattering revealed rich phase behavior as a function of alpha, the overall particle core volume fraction (f(core) ), and temperature. BCC, HCP, and Frank-Kasper sigma, C14, C15, and dodecagonal quasicrystal phases, were all identified. Dry-brush homopolymer distribution (alpha = 0.80 and 1.00) favor C14 and C15 phases with macrophase separation at high homopolymer loadings. Wet-brush homopolymer distributions in the particle cores (alpha = 0.42) lead to narrow sigma or C15 windows and cylinders at greater O concentrations. Solvent-like swelling (alpha = 0.23) favors widespread a phase formation.
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