TY - JOUR
T1 - Linear viscoelasticity and director dynamics of nematic liquid crystalline polymer melts
AU - Long, D.
AU - Morse, D. C.
PY - 2000/1/11
Y1 - 2000/1/11
N2 - We describe the linear viscoelastic response of monodomains of unentangled nematic liquid crystalline polymers, using a generalized Rouse model. We calculate the dynamic relaxation functions analogous to the Leslie viscosities. As a consequence of the coupling of the macroscopic director orientation n to Rouse relaxation of the chain conformations, we predict: 1) a non-monotonic evolution of the director orientation after a step deformation and continuous tumbling in steady shear for extended chains (with no hairpins), and flow alignment of anisotropic Gaussian chains (with many hairpins), and 2) a phenomenon of "director recoil" in the response of n to a transient magnetic field.
AB - We describe the linear viscoelastic response of monodomains of unentangled nematic liquid crystalline polymers, using a generalized Rouse model. We calculate the dynamic relaxation functions analogous to the Leslie viscosities. As a consequence of the coupling of the macroscopic director orientation n to Rouse relaxation of the chain conformations, we predict: 1) a non-monotonic evolution of the director orientation after a step deformation and continuous tumbling in steady shear for extended chains (with no hairpins), and flow alignment of anisotropic Gaussian chains (with many hairpins), and 2) a phenomenon of "director recoil" in the response of n to a transient magnetic field.
UR - http://www.scopus.com/inward/record.url?scp=0034338722&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0034338722&partnerID=8YFLogxK
U2 - 10.1209/epl/i2000-00142-5
DO - 10.1209/epl/i2000-00142-5
M3 - Article
AN - SCOPUS:0034338722
VL - 49
SP - 255
EP - 261
JO - Journal de Physique (Paris), Lettres
JF - Journal de Physique (Paris), Lettres
SN - 0295-5075
IS - 2
ER -