Extreme Elasticity Anisotropy in Molecular Glasses

Cang, Yu; Wang, Zuyuan; Bishop, Camille; Yu, Lian; Ediger, M. D.; Fytas, George

doi:10.1002/adfm.202001481

Title: Extreme Elasticity Anisotropy in Molecular Glasses

Journal Article · 21 April 2020 · Advanced Functional Materials

DOI: https://doi.org/10.1002/adfm.202001481 · OSTI ID:1615853

^[1]; Wang, Zuyuan ^[1]; Bishop, Camille ^[2]; Yu, Lian ^[2];

^[2];

^[1]

Max Planck Institute for Polymer Research Ackermannweg 10 Mainz 55128 Germany
Department of Chemistry University of Wisconsin‐Madison 1101 University Avenue Madison WI 53706 USA

Abstract Glasses are generally assumed to be isotropic and there are no literature reports of elastic anisotropy for molecular glasses. However, as glasses formed by physical vapor deposition can be structurally anisotropic, it is of interest to investigate the elastic anisotropy in these materials. Micro‐Brillouin light spectroscopy is used in several experimental geometries to determine the elastic stiffness tensors of three glass films of itraconazole vapor‐deposited at substrate temperatures ( T _sub ) of 330, 315, and 290 K, respectively. Significant elastic anisotropy is observed and, in these glasses, the elastic anisotropy shows a strong correlation with the molecular orientation. The out‐of‐plane and in‐plane Young's moduli of the high T _sub (330 K) sample, which features a predominantly vertical molecular orientation, exhibit a high anisotropy ratio of 2.2. The observed elastic anisotropy is much larger than those previously observed in liquid crystals and even many crystalline solids.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1615853

Journal Information:: Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 23 Vol. 30; ISSN 1616-301X

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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