Impact of small changes in particle surface chemistry for unentangled polymer nanocomposites
Abstract
Here, we report microstructural and rheological consequences of altering silica particle surface chemistry when the particles are suspended in unentangled polyethylene glycol with a molecular weight of 400. The particle surfaces are altered by reacting them with isobutyltrimethyoxysilane. Levels of silanization are chosen so that the particles remain dispersed in the polymer at all volume fractions studied. Our studies indicate that at the levels studied, silanization does not alter the hydrodynamic thickness of the absorbed polymer layer thickness. Rheological properties are not sensitive to levels of silanization up to particle volume fractions where the average particle separation h ~ 6Rg (4.8 nm). At these volume fractions, composite microstructure undergoes changes associated with jamming of soft particles (decorrelations in the first peak of the particle structure factor and the onset of a non-diffusive mechanism that dominates particle density fluctuations at short times.) In the region of volume fractions where h/Rg < 6, the zero-shear rate viscosity of the composites is extremely sensitive to level of silanization with a decrease in the zero-shear rate viscosity by four orders of magnitude observed for the highest levels of silanization studied in comparison to the bare particles.
- Authors:
-
- Univ. of Illinois at Urbana-Champaign, IL (United States)
- FAMU-FSU College of Engineering, Tallahassee, FL (United States)
- Univ. at Buffalo, NY (United States)
- Publication Date:
- Research Org.:
- Univ. of Illinois at Urbana-Champaign, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; DOE - BASIC ENERGY SCIENCESU.S. ARMY RESEARCH
- OSTI Identifier:
- 1875502
- Alternate Identifier(s):
- OSTI ID: 1170037
- Grant/Contract Number:
- FG02-07ER46471; AC02-06CH11357; W911NF-13-1-0132
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Soft Matter
- Additional Journal Information:
- Journal Volume: 11; Journal Issue: 8; Journal ID: ISSN 1744-683X
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING
Citation Formats
Ranka, Moulik, Varkey, Nihal, Ramakrishnan, Subramanian, and Zukoski, Charles F. Impact of small changes in particle surface chemistry for unentangled polymer nanocomposites. United States: N. p., 2014.
Web. doi:10.1039/c4sm01598c.
Ranka, Moulik, Varkey, Nihal, Ramakrishnan, Subramanian, & Zukoski, Charles F. Impact of small changes in particle surface chemistry for unentangled polymer nanocomposites. United States. https://doi.org/10.1039/c4sm01598c
Ranka, Moulik, Varkey, Nihal, Ramakrishnan, Subramanian, and Zukoski, Charles F. Wed .
"Impact of small changes in particle surface chemistry for unentangled polymer nanocomposites". United States. https://doi.org/10.1039/c4sm01598c. https://www.osti.gov/servlets/purl/1875502.
@article{osti_1875502,
title = {Impact of small changes in particle surface chemistry for unentangled polymer nanocomposites},
author = {Ranka, Moulik and Varkey, Nihal and Ramakrishnan, Subramanian and Zukoski, Charles F.},
abstractNote = {Here, we report microstructural and rheological consequences of altering silica particle surface chemistry when the particles are suspended in unentangled polyethylene glycol with a molecular weight of 400. The particle surfaces are altered by reacting them with isobutyltrimethyoxysilane. Levels of silanization are chosen so that the particles remain dispersed in the polymer at all volume fractions studied. Our studies indicate that at the levels studied, silanization does not alter the hydrodynamic thickness of the absorbed polymer layer thickness. Rheological properties are not sensitive to levels of silanization up to particle volume fractions where the average particle separation h ~ 6Rg (4.8 nm). At these volume fractions, composite microstructure undergoes changes associated with jamming of soft particles (decorrelations in the first peak of the particle structure factor and the onset of a non-diffusive mechanism that dominates particle density fluctuations at short times.) In the region of volume fractions where h/Rg < 6, the zero-shear rate viscosity of the composites is extremely sensitive to level of silanization with a decrease in the zero-shear rate viscosity by four orders of magnitude observed for the highest levels of silanization studied in comparison to the bare particles.},
doi = {10.1039/c4sm01598c},
journal = {Soft Matter},
number = 8,
volume = 11,
place = {United States},
year = {Wed Dec 17 00:00:00 EST 2014},
month = {Wed Dec 17 00:00:00 EST 2014}
}
Web of Science
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