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Synthesis of rod‐coil block copolymers via end‐functionalized poly( p ‐phenylene)s
Author(s) -
Marsitzky Dirk,
Brand Thorsten,
Geerts Yves,
Klapper Markus,
Müllen Klaus
Publication year - 1998
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/(sici)1521-3927(19980701)19:7<385::aid-marc385>3.0.co;2-x
Subject(s) - phenylene , polymer chemistry , copolymer , ethylene oxide , polystyrene , materials science , monomer , condensation polymer , condensation , self condensation , oxide , polymer , composite material , physics , thermodynamics , metallurgy
This paper describes a new way to synthesize rod‐coil block copolymers consisting of poly( p ‐phenylene) (PPP) as rigid rod and either polystyrene (PS) or poly(ethylene oxide) (PEO) as flexible coil. The Suzuki‐coupling of the AB‐type monomer 4‐bromo‐2,5‐diheptylbenzeneboronic acid (1) under strictly proton‐free conditions leads to the control of PPP endgroups and hence allows the synthesis of a variety of differently end‐functionalized poly( p ‐phenylene)s. The poly(2,5‐diheptyl‐ p ‐phenylene)‐ block ‐polystyrene (7) is then prepared via condensation via condensation of anionically polymerized living polystyrene ( 6 ) with α‐(4‐formylphenyl)‐ω‐phenyl‐poly(2,5diheptyl‐ p ‐phenylene) ( 4 ). Toluenesulfonic acid catalyzed condensation of α‐methyl‐ω‐amino‐poly(oxyethylene) ( 8 ) with PPP 4 yields poly(2,5‐diheptyl‐ p ‐phenylene)‐ block ‐poly(ethylene oxide) ( 9 ).