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Title: Real-time Depth Sectioning: Isolating the Effect of Stress on Structure Development in Pressure-Driven Flow

Abstract

Transient structure development at a specific distance from the channel wall in a pressure-driven flow is obtained from a set of real-time measurements that integrate contributions throughout the thickness of a rectangular channel. This 'depth sectioning method' retains the advantages of pressure-driven flow while revealing flow-induced structures as a function of stress. The method is illustrated by applying it to isothermal shear-induced crystallization of an isotactic polypropylene using both synchrotron x-ray scattering and optical retardance. Real-time, depth-resolved information about the development of oriented precursors reveals features that cannot be extracted from ex-situ observation of the final morphology and that are obscured in the depth-averaged in-situ measurements. For example, at 137 degrees C and at the highest shear stress examined (65 kPa), oriented thread-like nuclei formed rapidly, saturated within the first 7 s of flow, developed significant crystalline overgrowth during flow and did not relax after cessation of shear. At lower stresses, threads formed later and increased at a slower rate. The depth sectioning method can be applied to the flow-induced structure development in diverse complex fluids, including block copolymers, colloidal systems, and liquid-crystalline polymers.

Authors:
; ;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
980427
Report Number(s):
BNL-93345-2010-JA
Journal ID: ISSN 0148-6055; JORHD2; TRN: US1005496
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Journal Name:
Journal of Rheology
Additional Journal Information:
Journal Volume: 53; Journal Issue: 5; Journal ID: ISSN 0148-6055
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; COPOLYMERS; CRYSTALLIZATION; DEPTH; DISTANCE; FLUIDS; FUNCTIONS; MORPHOLOGY; NUCLEI; POLYMERS; POLYPROPYLENE; SCATTERING; SHEAR; STRESSES; SYNCHROTRONS; THICKNESS; TRANSIENTS; WALLS; national synchrotron light source

Citation Formats

Fernandez-Ballester, L, Thurman, D, and Kornfield, J. Real-time Depth Sectioning: Isolating the Effect of Stress on Structure Development in Pressure-Driven Flow. United States: N. p., 2009. Web. doi:10.1122/1.3164970.
Fernandez-Ballester, L, Thurman, D, & Kornfield, J. Real-time Depth Sectioning: Isolating the Effect of Stress on Structure Development in Pressure-Driven Flow. United States. https://doi.org/10.1122/1.3164970
Fernandez-Ballester, L, Thurman, D, and Kornfield, J. 2009. "Real-time Depth Sectioning: Isolating the Effect of Stress on Structure Development in Pressure-Driven Flow". United States. https://doi.org/10.1122/1.3164970.
@article{osti_980427,
title = {Real-time Depth Sectioning: Isolating the Effect of Stress on Structure Development in Pressure-Driven Flow},
author = {Fernandez-Ballester, L and Thurman, D and Kornfield, J},
abstractNote = {Transient structure development at a specific distance from the channel wall in a pressure-driven flow is obtained from a set of real-time measurements that integrate contributions throughout the thickness of a rectangular channel. This 'depth sectioning method' retains the advantages of pressure-driven flow while revealing flow-induced structures as a function of stress. The method is illustrated by applying it to isothermal shear-induced crystallization of an isotactic polypropylene using both synchrotron x-ray scattering and optical retardance. Real-time, depth-resolved information about the development of oriented precursors reveals features that cannot be extracted from ex-situ observation of the final morphology and that are obscured in the depth-averaged in-situ measurements. For example, at 137 degrees C and at the highest shear stress examined (65 kPa), oriented thread-like nuclei formed rapidly, saturated within the first 7 s of flow, developed significant crystalline overgrowth during flow and did not relax after cessation of shear. At lower stresses, threads formed later and increased at a slower rate. The depth sectioning method can be applied to the flow-induced structure development in diverse complex fluids, including block copolymers, colloidal systems, and liquid-crystalline polymers.},
doi = {10.1122/1.3164970},
url = {https://www.osti.gov/biblio/980427}, journal = {Journal of Rheology},
issn = {0148-6055},
number = 5,
volume = 53,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 2009},
month = {Thu Jan 01 00:00:00 EST 2009}
}