Non-centrosymmetric superlattices in block copolymer blends

Thorsten Goldacker, Volker Abetz (), Reimund Stadler, Igor Erukhimovich and Ludwik Leibler
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Thorsten Goldacker: Lehrstuhl Makromolekulare Chemie II, Universität Bayreuth
Volker Abetz: Lehrstuhl Makromolekulare Chemie II, Universität Bayreuth
Reimund Stadler: Lehrstuhl Makromolekulare Chemie II, Universität Bayreuth
Igor Erukhimovich: Moscow State University
Ludwik Leibler: Unité Mixte de Recherches CNRS - Elf Atochem (UMR 167)

Nature, 1999, vol. 398, issue 6723, 137-139

Abstract: Abstract Materials with a macroscopic electric polarization display a variety of useful properties, such as piezo- and pyroelectricity and second-order nonlinear optical activity1. Macroscopic polarization results when dipolar molecules are orientated in the same direction, or when ions are organized in a non-centrosymmetric crystal structure2. Centrosymmetric molecules have no dipole moment and so cannot generate a macroscopic polarization. Non-centrosymmetry in amorphous materials can be engineered by depositing particular sequences of layers on top of each other, or by applying external fields (generally electric) to orientate the molecules3. Here we report the formation of a non-centrosymmetric structure in an amorphous material through spontaneous self-assembly. Block copolymers are known to form ordered structures at the microscale owing to segregation of the different blocks4, 5. We show that a mixture of a ternary triblock copolymer and a binary diblock copolymer will organize itself into a non-centrosymmetric layered structure in which the layers are occupied by different blocks. The structure is periodic with a length scale of around 60 nm.

Date: 1999
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DOI: 10.1038/18191

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