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Synthesis and characterization of block copolymers containing cationic blocks
Author(s) -
Lieske Antje,
Jaeger Werner
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(19980201)199:2<255::aid-macp255>3.0.co;2-d
Subject(s) - copolymer , polymer chemistry , cationic polymerization , chemistry , gel permeation chromatography , polymer , ethylene glycol , monomer , dispersity , aqueous solution , polymerization , emulsion polymerization , styrene , radical polymerization , organic chemistry
Poly(ethylene glycol)‐poly(diallyldimethylammonium chloride) block copolymers containing nearly equal number of both monomer units were synthesized by free radical polymerization using macroazoinitiators of different molecular weights obtained from 2,2'‐azoisobutyronitrile (AIBN) and poly(ethylene glycol). Characterization by elemental analysis, gel permeation chromatography and ultracentrifugation proved the formation of ABA‐block copolymers. Furthermore, the polymers were characterized by DSC and viscosimetric measurements. The block copolymers lowered the surface tension of their aqueous solutions. Cross‐sectional areas A min of some of the polymers were calculated from surface tension vs. concentration isotherms. The results indicate the PEG‐blocks to be adsorbed at the air‐water interface, whereas the poly‐(DADMAC)‐block is completely present in the aqueous phase. The block copolymers are powerful stabilizers in emulsion polymerization of styrene, resulting in monodisperse cationic latexes.