Synthesis and Thin Film Phase Behaviour of Functional Rod‐Coil Block Copolymers Based on Poly(para‐phenylenevinylene) and Poly(lactic acid)
- 14 April 2011
- journal article
- research article
- Published by Wiley in Macromolecular Rapid Communications
- Vol. 32 (11) , 813-819
Abstract
We report the synthesis of a series of block copolymers consisting of a rod-like semiconducting poly(2,5-di(2′-ethylhexyloxy)-1,4-phenylenevinylene) (DEH-PPV) block and a flexible poly(lactic acid) (PLA) block that can be selectively degraded under mild conditions. Such selectively degradable block copolymers are designed as self-assembling templates for bulk heterojunction donor–acceptor layers in organic solar cells. A lamellar microphase-separated domain structure was identified for block copolymers with PLA volume fractions between 29 and 79% in bulk and thin films using SAXS, TEM, and AFM. Depending on the ratio of the two blocks we find either lamellae oriented parallel or perpendicular to the substrate in thin films.Keywords
Funding Information
- DFG
- Emmy Noether program and the Freiburg Institute
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