Neutron reflectivity measurements of the translational motion of tris(naphthylbenzene) at the glass transition temperature

The translational dynamics of the low molecular weight glass-former tris(naphthylbenzene) have been studied on the length scale of a few nanometers at the glass transition temperature Tg. Neutron reflectivity was used to measure isotopic interdiffusion of multilayer samples created by physical vapor...

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Bibliographic Details
Published in:The Journal of chemical physics 2006-05, Vol.124 (18), p.184501-184501
Main Authors: Swallen, Stephen F, Mapes, Marie K, Kim, Yong Seol, McMahon, Robert J, Ediger, M D, Satija, Sushil
Format: Article
Language:English
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Summary:The translational dynamics of the low molecular weight glass-former tris(naphthylbenzene) have been studied on the length scale of a few nanometers at the glass transition temperature Tg. Neutron reflectivity was used to measure isotopic interdiffusion of multilayer samples created by physical vapor deposition. Deposition with the substrate held at Tg-6 K allows observation of dynamics characterizing the equilibrium supercooled liquid. The diffusion coefficient measured at q = 0.03 A(-1) was determined to be 1x10(-17) cm2/s at 342 K (Tg). The self-part of the intermediate scattering function I(s)(q,t) decays exponentially. Samples deposited well below Tg show a substantial thermal history effect during subsequent translational motion at Tg.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.2191492