Polymer Engineering Faculty Research
Title
Elastic constants and dimensions of imprinted polymeric nanolines determined from Brillouin light scattering
Document Type
Article
Publication Date
Fall 2010
Abstract
Elastic constants and cross-sectional dimensions of imprinted nanolines of poly(methyl methacrylate) (PMMA) on silicon substrates are determined nondestructively from finite-element inversion analysis of dispersion curves of hypersonic acoustic modes of these nanolines measured with Brillouin light scattering. The results for the cross-sectional dimensions, under the simplifying assumption of vertical sides and a semicircular top, are found to be consistent with dimensions determined from critical-dimension small-angle x-ray scattering measurements. The elastic constants C(11) and C(44) are found to be, respectively, 11.6% and 3.1% lower than their corresponding values for bulk PMMA. This result is consistent with the dimensional dependence of the quasi-static Young's modulus determined from buckling measurements on PMMA films with lower molecular weights. This study provides the first evidence of size-dependent effects on hypersonic elastic properties of polymers.
Volume
21
Recommended Citation
Vogt, Bryan, "Elastic constants and dimensions of imprinted polymeric nanolines determined from Brillouin light scattering" (2010). Polymer Engineering Faculty Research. 1047.
https://ideaexchange.uakron.edu/polymerengin_ideas/1047