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Proceedings Paper

Electromechanical properties of anisotrope ultrathin layers of polyglutamates
Author(s): Thomas Jaworek; Gunnar Glasser; R. H. Wieringa; A. J. Schouten; Gerhard Wegner; Dieter Neher
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Paper Abstract

The electromechanical properties of ultrathin films of polyglutamates with either a preferential polar upright orientation of the helical chains or an orientation parallel to the substrate plane are compared. The electric field- induced change in film thickness as determined by an electromechanical interferometer is used to measure of the degree of polar order and the mechanical compliance. Following the approach by Whitesell and Chang monomolecular films of 15 nanometer thickness of the helical polypeptide poly((gamma) -benzyl-L-glutamate) (PBLG) were grown directly from a flat aluminum surface. The measured PBLG film polarization was found to be comparable to that of conventional ferroelectric materials. This result demonstrates that the polymerization starting from the surface forces the helical chains into a polar arrangement. A large mechanical plate modulus of the film of approximately 35 GPa as determined by electrostriction agreed with the theoretical prediction for a single PBLG molecule along the chain axis.In contrast to this, Langmuir- Blodgett layers of poly((gamma) -octadecyl-co-methyl-L- glutamate)s, bearing long flexible side chains, exhibited only negligible piezoelectric activities, as the helices are oriented parallel to the substrate surface.In this case the mechanical properties were almost entirely determined by the structure and packing of the flexible side chains.

Paper Details

Date Published: 29 October 1998
PDF: 9 pages
Proc. SPIE 3474, Second-Order Organic Nonlinear Optics, (29 October 1998); doi: 10.1117/12.328581
Show Author Affiliations
Thomas Jaworek, Max-Planck-Institut fuer Polymerforschung (Germany)
Gunnar Glasser, Max-Planck-Institut fuer Polymerforschung (Germany)
R. H. Wieringa, Univ. Groningen (Netherlands)
A. J. Schouten, Univ. Groningen (Netherlands)
Gerhard Wegner, Max-Planck-Institut fuer Polymerforschung (Germany)
Dieter Neher, Max-Planck-Institut fuer Polymerforschung (Germany)

Published in SPIE Proceedings Vol. 3474:
Second-Order Organic Nonlinear Optics
Manfred Eich, Editor(s)

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