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Block copolymers prepared by emulsion polymerization with poly(ethylene oxide)–azo‐initiators
Author(s) -
Tauer K.
Publication year - 1995
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1995.220060703
Subject(s) - copolymer , materials science , ethylene oxide , emulsion , polymerization , emulsion polymerization , polymer chemistry , ethylene , oxide , poly ethylene , block (permutation group theory) , polymer science , chemical engineering , organic chemistry , polymer , catalysis , composite material , chemistry , geometry , mathematics , metallurgy , engineering
Poly(ethylene oxide)‐b‐poly(styrene) block copolymers were prepared in the form of latex particles by emulsion polymerization of styrene with poly(ethylene glycol)–azo‐initiators as well as with the redox initiation system poly(ethylene glycol)/Ce 4+ . The emulsion polymerization can be carried out in the absence of additional stabilizers if the chain length of the poly(ethylene glycol) is greater than 40. The latex particles as well as the copolymers were characterized by capillary hydrodynamic fractionation, 13 C‐nuclear magnetic resonance (NMR) spectroscopy and Fourier transform infrared spectroscopy. By 13 C‐NMR spectroscopy a side reaction of the primary radicals arising from the azo‐initiator was found which can contribute to the low efficiency of azo‐initiators in emulsion polymerization.