Controlling the morphology of side chain liquid crystalline block copolymer thin films through variations in liquid crystalline content.

Controlling the morphology of side chain liquid crystalline block copolymer thin films through variations in liquid crystalline content.
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DOI:
10.1021/nl802298m
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发表时间:
2008-10
期刊:
影响因子:
10.8
通讯作者:
Hammond PT
Hammond PT
中科院分区:
材料科学1区
文献类型:
--
作者:
Verploegen E;Zhang T;Jung YS;Ross C;Hammond PT

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In this paper we describe methods for manipulating the morphology of side-chain liquid crystalline block copolymers through variations in the liquid crystalline content. By systematically controlling the covalent attachment of side chain liquid crystals to a block copolymer (BCP) backbone, the morphology of both the liquid crystalline (LC) mesophase and the phase segregated BCP microstructures can be precisely manipulated. Increases in LC functionalization lead to stronger preferences for the anchoring of the LC mesophase relative to the substrate and the inter-material dividing surface (IMDS). By manipulating the strength of these interactions the arrangement and ordering of the ultrathin film block copolymer nanostructures can be controlled, yielding a range of morphologies that includes perpendicular and parallel cylinders, as well as both perpendicular and parallel lamellae. Additionally, we demonstrate the utilization of selective etching to create a nanoporous liquid crystalline polymer thin film. The unique control over the orientation and order of the self-assembled morphologies with respect to the substrate will allow for the custom design of thin films for specific nano-patterning applications without manipulation of the surface chemistry or the application of external fields.
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