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Nitroxide‐controlled free radical polymerization of p‐tert ‐butoxystyrene. Kinetics and applications
Author(s) -
Ohno Kohji,
Ejaz Muhammad,
Fukuda Takeshi,
Miyamoto Takeaki,
Shimizu Yusuke
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<291::aid-macp291>3.0.co;2-d
Subject(s) - polymerization , nitroxide mediated radical polymerization , polymer chemistry , copolymer , dispersity , radical polymerization , lamellar structure , chemistry , polymer , living free radical polymerization , polystyrene , living polymerization , degree of polymerization , materials science , organic chemistry , crystallography
The free radical polymerization of p‐tert ‐butoxystyrene (BOS) in the bulk at 125°C “initiated” with the adduct of 2‐benzoyloxy‐1‐phenylethyl and TEMPO (BS‐TEMPO) was found to proceed in a “living” fashion, providing low‐polydispersity PBOS and block copolymers of the type PBOS‐ b ‐PS, where TEMPO is 2,2,6,6‐tetramethylpiperidin‐1‐oxyl and PS is polystyrene. The acidolysis of the polymers gave well‐defined poly( p ‐vinylphenol) (PVP) polymers. The PVP‐ b ‐PS block copolymers were observed to exhibit lamellar and cylindrical microdomain morphologies depending on the copolymer composition. The rate of BOS polymerization is independent of the “initiator” (BS‐TEMPO) concentration, being essentially equal to the rate of thermal polymerization. The polydispersity of PBOS depends on polymerization time but not on the degree of polymerization, under the studied experimental conditions.