Structure, nanomechanics, and dynamics of dispersed surfactant‐free clay nanocomposite films
Abstract
The current work presents a new approach to achieve high quality dispersion of surfactant‐free nanoclay tactoid particles in sub‐micron thin films despite the absence of organic modifier. Natural Montmorillonite particles, Cloisite, were dispersed in thin films of polycaprolactone (PCL) through a flow coating technique assisted by ultra‐sonication. Wide‐angle X‐ray scattering (WAXS), grazing‐incidence wide‐angle X‐ray scattering (GI‐WAXS), and transmission electron microscopy (TEM) were used to confirm the level of natural clay dispersion down to the level of tactoids (sub‐micron scale stacks of clay sheets). These characterization techniques were carried out in conjunction with an analysis of nanomechanical properties via strain‐induced buckling instability for modulus measurements (SIEBIMM), a high‐throughput technique to characterize thin film mechanical properties. The buckling patterns indicate that the natural clay tactoids separate buckling‐enhancing (high‐modulus) crystalline regions and interconnect buckling‐suppressing amorphous (low‐modulus) regions. Due to the tactoid length scale, the glass transition behavior of the composites as characterized by broadband dielectric relaxation spectroscopy was unmodified by the clay. Likewise, the glass transition temperature, T g , and fragility (slope of relaxation time behavior approaching T g ), remain unaffected, indicating that these dispersed tactoids do not induce pronounced confinement effects on dynamics. POLYM. ENG. SCI., 58:1285–1295, 2018. © 2018more »
- Authors:
-
[3];
[1];
[1]
- Department of Polymer Engineering University of Akron Akron Ohio 44325
- Department of Polymer Engineering University of Akron Akron Ohio 44325, Materials Science and Engineering Division National Institute of Standards and Technology Gaithersburg Maryland 20899
- Materials Science and Engineering Division National Institute of Standards and Technology Gaithersburg Maryland 20899
- Chemistry Department, Faculty of Science King Saud University Riyadh 11451 Saudi Arabia
- Materials Science and Technology Program, College of Arts and Sciences, Qatar University, PO Box 2713, Doha, Qatar &, Polymer Materials Research Department, Advanced Technology and New Materials Research Institute City for Scientific Research and Technology Applications New Borg El‐Arab City Alexandria Egypt
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1422235
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Polymer Engineering and Science
- Additional Journal Information:
- Journal Name: Polymer Engineering and Science Journal Volume: 58 Journal Issue: 8; Journal ID: ISSN 0032-3888
- Publisher:
- Wiley Blackwell (John Wiley & Sons)
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Zhang, Xiao, Zhao, Jing, Snyder, Chad R., Al‐Enizi, Abdullah, Eltazahry, Ahmed, Simmons, David S., and Karim, Alamgir. Structure, nanomechanics, and dynamics of dispersed surfactant‐free clay nanocomposite films. United States: N. p., 2018.
Web. doi:10.1002/pen.24693.
Zhang, Xiao, Zhao, Jing, Snyder, Chad R., Al‐Enizi, Abdullah, Eltazahry, Ahmed, Simmons, David S., & Karim, Alamgir. Structure, nanomechanics, and dynamics of dispersed surfactant‐free clay nanocomposite films. United States. https://doi.org/10.1002/pen.24693
Zhang, Xiao, Zhao, Jing, Snyder, Chad R., Al‐Enizi, Abdullah, Eltazahry, Ahmed, Simmons, David S., and Karim, Alamgir. Thu .
"Structure, nanomechanics, and dynamics of dispersed surfactant‐free clay nanocomposite films". United States. https://doi.org/10.1002/pen.24693.
@article{osti_1422235,
title = {Structure, nanomechanics, and dynamics of dispersed surfactant‐free clay nanocomposite films},
author = {Zhang, Xiao and Zhao, Jing and Snyder, Chad R. and Al‐Enizi, Abdullah and Eltazahry, Ahmed and Simmons, David S. and Karim, Alamgir},
abstractNote = {The current work presents a new approach to achieve high quality dispersion of surfactant‐free nanoclay tactoid particles in sub‐micron thin films despite the absence of organic modifier. Natural Montmorillonite particles, Cloisite, were dispersed in thin films of polycaprolactone (PCL) through a flow coating technique assisted by ultra‐sonication. Wide‐angle X‐ray scattering (WAXS), grazing‐incidence wide‐angle X‐ray scattering (GI‐WAXS), and transmission electron microscopy (TEM) were used to confirm the level of natural clay dispersion down to the level of tactoids (sub‐micron scale stacks of clay sheets). These characterization techniques were carried out in conjunction with an analysis of nanomechanical properties via strain‐induced buckling instability for modulus measurements (SIEBIMM), a high‐throughput technique to characterize thin film mechanical properties. The buckling patterns indicate that the natural clay tactoids separate buckling‐enhancing (high‐modulus) crystalline regions and interconnect buckling‐suppressing amorphous (low‐modulus) regions. Due to the tactoid length scale, the glass transition behavior of the composites as characterized by broadband dielectric relaxation spectroscopy was unmodified by the clay. Likewise, the glass transition temperature, T g , and fragility (slope of relaxation time behavior approaching T g ), remain unaffected, indicating that these dispersed tactoids do not induce pronounced confinement effects on dynamics. POLYM. ENG. SCI., 58:1285–1295, 2018. © 2018 Society of Plastics Engineers},
doi = {10.1002/pen.24693},
journal = {Polymer Engineering and Science},
number = 8,
volume = 58,
place = {United States},
year = {Thu Feb 22 00:00:00 EST 2018},
month = {Thu Feb 22 00:00:00 EST 2018}
}
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