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Atropisomerism as a probe of restrictions to motion above and below the glass transition temperature of Polymers
Author(s) -
Park JIWoong,
Green Mark M.
Publication year - 2002
Publication title -
chirality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.43
H-Index - 77
eISSN - 1520-636X
pISSN - 0899-0042
DOI - 10.1002/chir.10057
Subject(s) - racemization , glass transition , chemistry , polymer , atropisomer , yield (engineering) , scale (ratio) , chemical physics , polymer chemistry , thermodynamics , organic chemistry , physics , quantum mechanics
This short review and interpretation of work conducted in the authors' laboratory concerns the use of atropisomeric 1,1′‐binaphthyl derivatives to gain information about the glassy properties of polymers. Bridged binaphthyls appended with oligophenyl paddles are found to yield a series of probes whose racemization kinetics reveal new kinds of information concerning the basis of the time scale and length scale for the restrictions to motion and the heterogeneity of the polymeric glassy state. Because the time scale of the racemization is slower than all other glass probes used previously, new kinds of information were gained for the first time below the glass transition temperature. Chirality 14:209–214, 2002.© 2002 Wiley‐Liss, Inc.