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Dynamics and glass transition of a starburst polymer from its low‐wavenumber Raman spectrum: neat poly(propylene imine) DAB‐ dendr ‐(CN) 64
Author(s) -
Rothschild Walter G.,
Perrot Michel,
Cavagnat Raymond M.
Publication year - 2001
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.790
Subject(s) - raman spectroscopy , glass transition , wavenumber , imine , polymer , branching (polymer chemistry) , chemistry , polymer chemistry , spectral line , analytical chemistry (journal) , materials science , organic chemistry , physics , optics , astronomy , catalysis
We obtained experimental correlation times, in the range 11–27 ps and at temperatures between 333 and 123 K, from the low‐wavenumber VH ‐Raman spectra of starburst polymer poly(propylene imine) DAB‐ dendr ‐(CN) 64 in its neat state which, we propose, quantify the deformational mobility of the entire system's propylene— N < [ethylene— CN] 2 links of its branching pattern. An activation plot of the correlation times extrapolates to a crossover value of T c ≈225 K, which we assign as ‘spectral signature’ of the system's known, thermodynamic glass transition temperature T G = 233 K. Copyright © 2001 John Wiley & Sons, Ltd.