Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session S54: Polymer Nanocomposites V: Thermodynamics and Dynamics
11:15 AM–2:15 PM,
Thursday, March 7, 2019
BCEC
Room: 254A
Sponsoring
Unit:
DPOLY
Chair: Robert Hickey, Pennsylvania State University
Abstract: S54.00012 : Deforming Interfacial Layers of Bare and Grafted Particle Nanocomposites in Large Amplitude Oscillatory Shear*
1:51 PM–2:03 PM
Presenter:
Siyang Yang
(Stevens Institute of Technology)
Authors:
Siyang Yang
(Stevens Institute of Technology)
Pinar Akcora
(Stevens Institute of Technology)
Chemical heterogeneity around nanoparticles yields enhancement in mechanical properties in polymer nanocomposites. We have shown interfacial layers composed of two miscible polymers on well-dispersed nanoparticles control the dynamics of chains and their temperature-induced stiffening response. In this work, we examined these interfacial layers and the evolution of entanglements under large amplitude oscillatory shear to reveal the stability of mechanical and structural behavior of attractive composites. Deformation-recovery experiments have shown that particles adsorbed with low rigidity polymer (PMMA) disentangle/re-entangle and reinforcement factor increased significantly, whereas with the high rigidity polymer (P2VP) the modulus recovered to its initial value. Fourier transform rheology results indicated that strain-softening resulted from the arrangement of interfacial PMMA chains, which yielded to a higher entanglement state and stiffening. The non-linear rheology results of the PMMA-grafted particles will be discussed with the results of PMMA-, PC- and P2VP-adsorbed chains with varying rigidity. Large shear-induced entanglements can therefore be explained through the deformability of chains in interfacial layers.
*This work is funded by NSF-CMMI-MEP, Grant #1538725, 1825250.
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700