Premium
Viscoelastic Properties of Clay‐Containing Nanocomposites of Thermotropic Liquid‐Crystal Polymer
Author(s) -
Bandyopadhyay Jayita,
Sinha Ray Suprakas,
Bousmina Mosto
Publication year - 2009
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200800479
Subject(s) - thermotropic crystal , nanocomposite , viscoelasticity , materials science , composite material , relaxation (psychology) , polymer , stress relaxation , liquid crystal , shear thinning , polymer chemistry , rheology , liquid crystalline , creep , psychology , social psychology , optoelectronics
Abstract The nanocomposites of liquid‐crystal polymer (LCP) with two different weight per cents of clay were prepared via the melt extrusion method. To investigate the properties of the materials in the linear and non‐linear viscoelastic regions, both oscillatory and rotational tests were carried out. The results showed that the nanocomposite with higher clay content exhibited an almost defectless partially cross‐linked structure compared to the nanocomposite with lower clay content or the pure LCP. The linear stress relaxation measurements revealed that the pure LCP relaxed faster than nanocomposites after imposition of a constant strain for a specific time. During the step rate relaxation test, high shear rate modified the defects in the pure LCP very quickly and probably attained almost an equilibrium position while the nanocomposite samples showed strong shear thinning behaviour.