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A Precursor Route to Supramolecular Oligo( p ‐phenylene terephthalamide) Block Copolymers
Author(s) -
Schleuss Tobias W.,
Schollmeyer Dieter,
Kilbinger Andreas F. M.
Publication year - 2008
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.200700633
Subject(s) - copolymer , polymer chemistry , dimer , phenylene , random hexamer , pentamer , chloroform , materials science , poly(p phenylene) , polymer , chemistry , organic chemistry , crystallography , biochemistry
New soluble precursors for the step‐wise synthesis of oligo( p ‐phenylene terephthalamide) block copolymers are described. Kevlar‐like aramide oligomers up to the hexamer (six phenyl groups) were prepared in a polymer‐analogous manner. Activating the carboxylic‐acid‐carrying oligomers as carbonyl chlorides while reversibly transforming the aromatic amides into imidoyl chlorides gave access to soluble precursors. The dimer and tetramer precursor were prepared and used in block copolymer synthesis. Single‐crystal XRD confirmed the structure of the dimer precursor. Above a critical rod length, the Kevlar‐like rod‐coil block copolymers show strong aggregation in non‐polar solvents such as chloroform.