Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 30, Issue 17, Pages 1509-1514Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.200900227
Keywords
diblock copolymers; microphase separated brush; single crystal; tethering density; thin film
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Funding
- National Natural Science Foundation of China [20621401, 20834005]
- Chinese Academy of Sciences [KJCX2-YW-M11]
- Ministry of Science and Technology of China [2009CB930603]
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In polystyrene-block-poly(ethylene oxide) thin square platelets can be obtained via fast solvent evaporation by controlling the tethering density (0.08 < sigma < 0.11). The tethering density of the brushes is proportional to the thickness of the PEO crystal and increases with increasing initial solution heating temperature (T-i). When T-i < T-m, where T-m is the melting point of PEO, brushes with microphase-separated structures are observed. The formation of microphase-separated brushes depends on two factors: the strong incompatibility between PS and noncrystalline PEO chains (attached to the crystalline PEO) and the weak interaction between PS-PS brushes.
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