共 41 条
Polydispersity-induced stabilization of the core-shell gyroid
被引:26
作者:

Meuler, Adam J.
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA

Ellison, Christopher J.
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h-index: 0
机构:
Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA

Hillmyer, Marc A.
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h-index: 0
机构:
Univ Minnesota, Dept Chem, Minneapolis, MN 55455 USA Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA

Bates, Frank S.
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h-index: 0
机构:
Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA
机构:
[1] Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA
[2] Univ Minnesota, Dept Chem, Minneapolis, MN 55455 USA
基金:
美国国家科学基金会;
关键词:
D O I:
10.1021/ma8010894
中图分类号:
O63 [高分子化学(高聚物)];
学科分类号:
070305 ;
080501 ;
081704 ;
摘要:
Polydispersity-driven macrophase separation has been introduced into the poly(ethylene oxide) (PEO) block of poly(isoprene-b-styrene-b-ethylene oxide) (ISO) triblock polymers to stabilize the core-shell gyroid (CSG) network mesostructure at a composition where it is not stable for the monodisperse analogue. A hydroxyl-terminated IS diblock (IS-OH) was synthesized by sequential anionic polymerization in cyclohexane using secbutyllithium as the initiator. The living chains were end-capped with ethylene oxide and terminated with degassed methanol. Five ethylene oxide polymerizations were initiated from the isolated IS-OH diblock using an established protocol. Synchrotron small-angle X-ray scattering (SAXS) experiments were also conducted. The increased polydispersity in the PEO block increases the entropic penalty incurred by the PEO chains as they stretch to accommodate the CSG mesostructure.
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页码:6272 / 6275
页数:4
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