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Synthesis of ABC‐triblock copolymers for light emitting diodes
Author(s) -
Heischkel Yvonne,
Schmidt HansWerner
Publication year - 1998
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19980501)199:5<869::aid-macp869>3.0.co;2-0
Subject(s) - copolymer , polymer chemistry , materials science , polymer science , polymer , composite material
In this paper we report on the synthesis and characterization of ABC‐triblock copolymers poly( N ‐vinylcarbazole)‐ block ‐poly(4‐(1‐pyrenyl)butyl vinyl ether)‐ block ‐poly(2‐[4‐(2‐phenyl‐1,3,4‐oxdiazolyl)phenyloxy]ethyl vinyl ether) 15 . The ABC‐triblock copolymers were synthesized by sequential living cationic polymerization of N ‐vinylcarbazole 11 , 4‐(1‐pyrenyl)butyl vinyl ether 10 and 2‐chloroethyl vinyl ether 3 . In a second step, the reactive pendant chloro groups of the poly(2‐chloroethyl vinyl ether) segment of the block copolymers were substituted with 2‐(4‐hydroxyphenyl)‐5‐phenyl‐1,3,4‐oxadiazole 6 to form fully functionalized ABC'‐triblock copolymers. The molecular weight of the block copolymers varied from M n = 4800 to 14000. The thermal behavior is discussed with respect to the block copolymer composition and compared with corresponding polymer blends. LED characteristics of a single layer device for one of the block copolymers are presented as an example.