| The following updates were incorporated into the downloadable PDF version of
the Abstract Book, the Program Book and the Poster Session Abstracts booklet, as
well as the online version: |
 Paper SG2 will be presented by
Jongwhi Lee. |
| Paper LC3 has been updated
(included in the printed version of Program Book). |
| Paper IR8 is replaced with
"Rheological characterization and processing of recycled polymers," by
Ruifeng Liang and Rakesh K. Gupta (included in the printed version of Program Book). |
Paper SL3: An author has been
added. The authors should now read:
Taeyong Lee1, Roderic Lakes2,
and Amit Lal3
1Biomedical Engineering, University of Wisconsin - Madison, Madison, WI 53706; 2Engineering
Mechanics, University of Wisconsin - Madison, Madison, WI 53706-1687; 3Electrical
Engineering, University of Wisconsin - Madison, Madison, WI 53706 |
|
| Paper SL11 will be presented by
Prashant G. Joshi. |
| Paper HT21 is replaced with
"Do fats act as lubricants in food?" by Suzzane Giasson, Imane Lahlou,
Sumana Chakrabarti, Tonya Kuhl, and Jacob Israelachvili (included in the printed version
of Program Book). |
| Papers PO13, PO16,
PO20, PO36 and PO37 have been withdrawn. |
Paper PO51 has
been added.
Development and use of a novel
cone and plate flow cell for x-ray scattering studies of materials from the vorticity
plane: Preliminary results from a 13.5wt% pbg/m-cresol solution
Franklin E. Caputo and Wesley R. Burghardt
Department of Chemical Engineering, Northwestern University, Evanston,
IL 60208-3210 |
| The evolution of structure in liquid crystalline polymers
during shear has a critical effect on their rheological behavior. In this work we present
a novel annular cone-and-plate flow cell which permits in situ x-ray scattering from the
1-2 plane during shear flow. The development of structure in LCPs has been extensively
studied using a variety of in situ scattering techniques to provide certain projections of
structure of the material. Previous in situ x-ray scattering studies have focused
primarily on the 1-3 plane of the flow. The 1-2 projection potentially holds more
information about the fluid structure than the 1-3 plane. Preliminary results of
experiments with 13.5 wt% racemic poly(benzyl glutamate) in m-cresol during steady shear
flow, transient shear protocols, and oscillatory flow will be presented. |
|
Paper PO52 has
been added.
Morphological transition in sheared
polymer blends: the interplay of coalescence, breakup and finite size
Kalman B. Migler
Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD
20899-8542 |
| We report the observation of a shear induced morphological
transition in concentrated polymer blends which occurs when the system thickness becomes
comparable to the droplet size of the dispersed component. Above a critical shear rate, we
observe coalescence and breakup; a living equilibrium in which large droplets break up
into smaller ones, and smaller droplets coalesce into larger ones. As the shear rate is
reduced below a critical value, droplets coalesce and form into stable strings, with
aspect ratios as large as 10^4. The transition is sharp, occurring over a shear interval
of as little as 5 %. Increasing the gap size yields a decrease in the critical shear rate,
as well as an increase in the critical droplet size. The transition is generic as we have
observed it in viscosity ratios ranging from 0.1 to 10, as well as over a range of
elasticity ratios. The transition is a manifestation of the weakening of the
Rayleigh-Tomatika instability as the system becomes quasi two-dimensional. |
|
