DENSITY-MEASUREMENTS OF ANNEALED AMORPHOUS POLYMERS

Authors
LEDNICKY F
Citation
F. Lednicky, DENSITY-MEASUREMENTS OF ANNEALED AMORPHOUS POLYMERS, Collection of Czechoslovak Chemical Communications, 60(11), 1995, pp. 1935-1940
Citations number
10
Categorie Soggetti
Chemistry
Journal title
Collection of Czechoslovak Chemical Communications → ACNP
ISSN journal
00100765
Volume
60
Issue
11
Year of publication
1995
Pages
1935 - 1940
Database
ISI
SICI code
0010-0765(1995)60:11<1935:DOAAP>2.0.ZU;2-#
Abstract
The flotation method of the density measurement was adapted to reach s ufficient accuracy with which the differences due to annealing amorpho us polymers above their glass transition temperature can be traced. Th e densities of amorphous poly(methyl methacrylate) and polystyrene inc rease logarithmically in the course of the annealing, which suggests t hat some arrangement or ordering takes place. However, the changes are not stable.