Campuses:

Droplet Size Effects for Liquid Crystalline Polymers in a Flexible Polymer Matrix

Thursday, January 11, 2001 - 2:00pm - 2:45pm
Keller 3-180
Morton Denn (City College, CUNY)
Droplets of a liquid crystalline polymer in a matrix of a flexible polymer exhibit unusual dynamical behavior when the droplet size becomes comparable to the correlation length for nematic order. I will describe some rheological and droplet relaxation experiments that illustrate unusual scaling and an apparent droplet-size dependence of the interfacial tension. I will then describe the results of a molecular simulation exploring the effect of far-field nematic order on the structure of the interphase' and the equilibrium interfacial tension between the two phases.

References Used:
Heon Sang Lee and Morton M. Denn, Rheology of a viscoelastic emulsion with a liquid crystalline polymer dispersed phase, Journal of Rheology, 43, 1583 - 1598 (1999)

Heon Sang Lee and Morton M. Denn, The deformation and retraction of thermotropic LCP droplets in a flexible matrix, J. Non-Newtonian Fluid Mechanics, 93, 315 323 (2000)

Xianfeng Li and Morton M. Denn, Influence of bulk nematic orientation on the interface between a liquid crystalline polymer and a flexible polymer, Physical Review Letters, 86, 656-659 (2001).