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Translational and Rotational Motion of Small Penetrants in AF1600 Nanocomposites

Published online by Cambridge University Press:  26 February 2011

Darryl Aucoin ,
Junyan Zhong ,
Gouxing Lin ,
Wen-Yang Wen  and
Alan A. Jones#
Darryl Aucoin
Affiliation:
[email protected], Clark University, Chemistry, 950 Main St., Worcester, MA, 01610, United States
Junyan Zhong
Affiliation:
[email protected], Clark University, Chemistry, 950 Main St., Worcester, MA, 01610, United States
Gouxing Lin
Affiliation:
[email protected], Clark University, Chemistry, 950 Main St., Worcester, MA, 01610, United States
Wen-Yang Wen
Affiliation:
[email protected], Clark University, Chemistry, 950 Main St., Worcester, MA, 01610, United States
Alan A. Jones#
Affiliation:
[email protected], Clark University, Chemistry, 950 Main St., Worcester, MA, 01610, United States
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Abstract

Translational and rotational motions of dichloromethane were observed in a composite of poly(2,2-bis(trifluoromethyl)-4,5-difluoro-1,3-dioxole-co-tetrafluoroethylene), also referred to as AF1600, with fumed silica using NMR. Pulsed field gradient diffusion measurements show that adding fumed silica to AF1600 results in a great enhancement of the diffusion coefficient of dichloromethane. The diffusion enhancement behavior is similar to that previously reported in pentane, cyclohexane, and toluene in AF1600 nanocomposites. Spin-lattice relaxation time measurements of this system indicate two domains: one containing larger free volume elements (FVEs) that support faster dynamics and one containing smaller free volume elements that support slower dynamics. Adding the fumed silica disrupts the packing of polymer chains resulting in an increase of free volume and improved connections between domains supporting rapid translation. The lattice model simulation is performed to assist in understanding the mechanism of how the addition of fumed silica improves penetrant diffusion in nanocomposite polymer systems.

Keywords

nuclear magnetic resonance (NMR)diffusionnanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 984: Symposium MM – Magnetic Resonance in Material Science , 2006 , 0984-MM05-04
Copyright
Copyright © Materials Research Society 2007

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