Glass-Transition Temperature (Tg) of Free-Radically Prepared Polyacrylonitrile by Inverse Gas Chromatography, 1. A Study on Tg of Atactic Monodisperse Polystyrenes

✍ Scribed by Masatomo Minagawa; Hiroyasu Kanoh; Satoshi Tanno; Yuhko Nishimoto

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 122 KB
• Volume: 203
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.200290030

✦ Synopsis

Abstract

The glass‐transition temperature (T~g~) of several atactic monodisperse polystyrenes (PSt)s was studied by an inverse gas chromatographic (IGC) analysis, as a preliminary study for the detection of the T~g~ of polyacrylonitrile. The T~g~ of PSt with different molecular weights was clearly obtained by this method. The agreement in the T~g~ values obtained by IGC and by differential scanning calorimetry (DSC) was quite good within the molecular‐weight range M~p~ = 7 600–2 430 000 (where, M~p~ = (M~n~ × M~w~)^1/2^). This method has a wide universality for the detection of the T~g~ of polymers. Several essential factors were extracted for the establishment of the optimum conditions for IGC measurements, such as the concentration of polymer toward a clay matrix (10 wt.‐%), and the type of lower probe, decane. The best probe was determined empirically from the most effective detection in the IGC measurements of PSt.

Molecular‐weight dependence of the T~g~ of PSt. Experimental data obtained here are indicated by an arrow. Other data was taken from ref.21

magnified imageMolecular‐weight dependence of the T~g~ of PSt. Experimental data obtained here are indicated by an arrow. Other data was taken from ref.21