Premium
Application of Fluorescence Depolarization Method to Monitor Free Volume in Gels of Stereoregular Polystyrene
Author(s) -
Itagaki Hideyuki
Publication year - 2008
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200851302
Subject(s) - polystyrene , polymer , fluorescence , materials science , molecule , tacticity , volume (thermodynamics) , polymer chemistry , chemical engineering , chemistry , organic chemistry , composite material , thermodynamics , polymerization , optics , physics , engineering
Summary: A fluorescence depolarization technique was applied to get the information on free volume among polymer chains in gel form. Four fluorescent molecules with different molecular sizes were doped throughout the gels of syndiotactic polystyrene (sPS) and isotactic polystyrene (iPS) physical gel system, and their fluorescence anisotropy values were examined in detail for a range of polymer concentrations. Consequently, the free volume among sPS chains in sPS/chloroform gels is as large as the size of molecules smaller than 1,5‐dimethylnaphthalene and is consistent with that of the cavity size in the δ ‐empty crystalline form of sPS solids. The cause to produce δ ‐empty crystalline form of sPS solids and to form cocrystals between sPS and guest molecules is discussed by comparing the molar size of guest molecules with the free volume among sPS chains in gel form.