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Nitroxide-controlled free radical polymerization of p-tert-butoxystyrene. Kinetics and applications

✍ Scribed by Kohji Ohno; Muhammad Ejaz; Takeshi Fukuda; Takeaki Miyamoto; Yusuke Shimizu

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 899 KB
Volume: 199
Category: Article
ISSN: 1022-1352
DOI: 10.1002/(sici)1521-3935(19980201)199:2<291::aid-macp291>3.0.co;2-d

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✦ Synopsis

The free radical polymerization of p-tert-butoxystyrene (BOS) in the bulk at 125 "C "initiated" with the adduct of 2-benzoyloxy-l-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-l-oxyl and PS is polystyrene. The acidolysis of the polymers gave well-defined poly@-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.

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