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Nanomaterials 2015, 5(1), 351-365; doi:10.3390/nano5010351

In Situ Self Assembly of Nanocomposites: Competition of Chaotic Advection and Interfacial Effects as Observed by X-Ray Diffreaction

1
Department of Chemistry, Clemson University, Clemson, SC 29634-0973, USA
2
Department of Mechanical Engineering, Clemson University, Clemson, SC 29634-0921, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Thibaud Coradin
Received: 3 February 2015 / Revised: 16 February 2015 / Accepted: 17 February 2015 / Published: 17 March 2015
(This article belongs to the Special Issue Self-Assembled Nanomaterials)
View Full-Text   |   Download PDF [2502 KB, uploaded 17 March 2015]   |  

Abstract

The effects of chaotic advection on the in situ assembly of a hierarchal nanocomposite of Poly Amide 6, (nylon 6 or PA6) and platelet shape nanoparticles (NPs) were studied. The assemblies were formed by chaotic advection, where melts of pristine PA6 and a mixture of PA6 with NPs were segregated into discrete layers and extruded into film in a continuous process. The process assembles the nanocomposite into alternating pristine-polymer and oriented NP/polymer layers. The structure of these hierarchal assemblies was probed by X-rays as a processing parameter, N, was varied. This parameter provides a measure of the extent of in situ structuring by chaotic advection. We found that all assemblies are semi-crystalline at room temperature. Increasing N impacts the ratio of α to γ crystalline forms. The effects of the chaotic advection vary with the concentration of the NPs. For nanocomposites with lower NP concentrations the amount of the γ crystalline form increased with N. However, at higher NP concentrations, interfacial effects of the NP play a significant role in determining the structure, where the NPs oriented along the melt flow direction and the polymer chains oriented perpendicular to the NP surfaces. View Full-Text
Keywords: assembly; nanocomposites; chaotic advection; nylon; smart blending; X-ray diffraction assembly; nanocomposites; chaotic advection; nylon; smart blending; X-ray diffraction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Ratnaweera, D.R.; Mahesha, C.; Zumbrunnen, D.A.; Perahia, D. In Situ Self Assembly of Nanocomposites: Competition of Chaotic Advection and Interfacial Effects as Observed by X-Ray Diffreaction. Nanomaterials 2015, 5, 351-365.

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