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Synthesis and Thin Film Phase Behaviour of Functional Rod‐Coil Block Copolymers Based on Poly( para ‐phenylenevinylene) and Poly(lactic acid)
Author(s) -
Braun Christoph H.,
Schöpf Benjamin,
Ngov Chheng,
Brochon Cyril,
Hadziioannou Georges,
Crossland Edward J. W.,
Ludwigs Sabine
Publication year - 2011
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201100012
Subject(s) - materials science , copolymer , lamellar structure , thin film , polymer chemistry , substrate (aquarium) , chemical engineering , small angle x ray scattering , phase (matter) , block (permutation group theory) , lamellar phase , polymer , composite material , nanotechnology , scattering , organic chemistry , chemistry , optics , oceanography , physics , geology , engineering , geometry , mathematics
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.