NONLINEAR RHEOLOGY OF CONFINED POLYMER MELTS UNDER OSCILLATORY FLOW

Citation
A. Subbotin et al., NONLINEAR RHEOLOGY OF CONFINED POLYMER MELTS UNDER OSCILLATORY FLOW, Macromolecules, 29(4), 1996, pp. 1296-1304
Citations number
21
Categorie Soggetti
Polymer Sciences
Journal title
ISSN journal
00249297
Volume
29
Issue
4
Year of publication
1996
Pages
1296 - 1304
Database
ISI
SICI code
0024-9297(1996)29:4<1296:NROCPM>2.0.ZU;2-#
Abstract
We present a theory for nonlinear dynamics of confined polymer melts u nder oscillatory flow. Using a Rouse-like model of chains with finite extensibility, we calculate elastic and dissipative stresses and corre sponding storage and loss moduli. The effect of bridges and surface sl ip are taken into account. Several features have been discovered: the storage modulus G' passes through a maximum with increasing strain amp litude in the range of intermediate frequencies, when adsorption is we ak and surface slip is important; the elastic sigma' and dissipative s igma '' stresses and the corresponding moduli G' and G '' show a jump with increasing strain amplitude when polymer bridges between the surf aces are formed.