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Molecular‐Complex Formation of Syndiotactic Polystyrene with Stable Radical Molecules
Author(s) -
Kaneko Fumitoshi,
Uda Yukihiro,
Kajiwara Atsushi,
Tanigaki Nobutaka
Publication year - 2006
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200600432
Subject(s) - thermogravimetric analysis , polystyrene , tacticity , materials science , electron paramagnetic resonance , phase (matter) , molecule , nitroxide mediated radical polymerization , clathrate hydrate , polymer chemistry , crystallography , chemistry , polymer , hydrate , organic chemistry , nuclear magnetic resonance , radical polymerization , copolymer , polymerization , composite material , physics
Summary: The formation of a molecular‐complex crystalline phase of syndiotactic polystyrene (sPS) that contains a stable nitroxide radical compound, 2,2,6,6‐tetramethylpiperidinyl‐ N ‐oxyl (TEMPO), is confirmed by IR and electron spin resonance (ESR) spectroscopy, X‐ray diffractometry, and thermogravimetric analysis. Through a guest exchange procedure assisted by a plasticizing agent, the original guest (chloroform) contained in the starting clathrate phase is completely replaced by TEMPO. Although the conformational regularity of the sPS helices in the resultant crystalline phase that contains TEMPO is similar to that in the starting clathrate phase, the host lattice expands in the 010 direction. The guest TEMPO molecules exhibit a significantly broadened ESR signal because of their highly concentrated state in the complex crystalline phase.Thermogravimetric measurement of a powder sample of the sPS/TEMPO complex.