Strain amplitude response and the microstructure of PA/clay nanocomposites

Wan, T, Clifford, MJ, Gao, F ORCID: 0000-0003-4064-9579, Bailey, AS, Gregory, DH and Somsunan, R, 2005. Strain amplitude response and the microstructure of PA/clay nanocomposites. Polymer, 46 (17), pp. 6429-6436. ISSN 0032-3861


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Polyamide 6/clay nanocomposites (PAn, where n is the mass fraction of clay) with various clay loading were prepared by melt compounding in a twin screw extruder. Exfoliation of clay in a PA matrix was confirmed by X-ray diffraction. Strain amplitude response of PAn in both melt and solution states has been investigated. In the melt state, critical strain amplitude of PAn is sensitive to strain amplitude response and decrease logarithmically with increasing clay loading. The elastic moduli (G′) of PAn are reversible under frequency loop sweeps. Comparisons of strain amplitude response in both melt and solution states have been conducted. Two different responses have been observed: strain thinning in the melt state and weak strain overshoot in the solution state. FTIR studies show that amide II band of PAn shifts toward high wavenumbers, but amide I band and N–H stretching vibration are independent of clay loading. We suggest that two types of strain amplitude response of PAn can be explained: strain thinning which is dominant in PAn caused by physical adsorption and entanglement of PA chains on nanoclays and weak strain overshoot caused by weak bonds between PA chains and nanoclays.

Item Type: Journal article
Publication Title: Polymer
Creators: Wan, T., Clifford, M.J., Gao, F., Bailey, A.S., Gregory, D.H. and Somsunan, R.
Publisher: Elsevier (not including Cell Press)
Place of Publication: Oxford
Date: 2005
Volume: 46
Number: 17
ISSN: 0032-3861
Rights: © 2005 Elsevier Ltd All rights reserved.
Divisions: Schools > School of Science and Technology
Depositing User: EPrints Services
Date Added: 09 Oct 2015 10:31
Last Modified: 09 Jun 2017 13:32

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