Title
Monolayer properties of a fuzzy rod polymer: Poly(γ-stearyl α, L-glutamate)
Date Issued
01 January 1996
Access level
metadata only access
Resource Type
journal article
Author(s)
Sohn D.
Yu H.
Russo P.S.
Daly W.H.
Louisiana State University
Publisher(s)
John Wiley and Sons Inc.
Abstract
Static and dynamic properties, and surface morphologies of monolayers at the air-water interface of a fuzzy rod polymer, poly(γ-stearyl α, L-glutamate), PSLG, have been examined by the Wilhelmy plate method for surface pressure, electrically induced capillary wave diffraction (ECWD), epi-fluorescence microscopy, and atomic force microscopy (AFM). The monolayers were first formed by spreading polymer solutions at the air-water interface and allowing the solvent to evaporate to obtain polymer films, i.e., spread monolayers. The surface mass density was varied by either successive additions of more solutions on a given surface area or step-wise compression of the surface barrier on a Langmuir trough. Surface pressure isotherms at 23-60°C were confirmed to be reversible and reproducible, and an abrupt change at approximately 60°C was observed, which is reported as the melting point of crystalline stearyl side chains. By AFM, the monolayer director n by surface alignment was confirmed as perpendicular to the compression direction and certain islands of departure from the monolayer state were visualized upon transferring the monolayers horizontally to silicon wafers. Macroscopic anisotropy in the surface alignment was probed by the electrocapillary waves propagated perpendicular (⊥) and parallel (//) to the director n; the surface tension anisotropy amount to about 7% difference, σ⊥/σ// < 0.07, where σ is the surface tension deduced from the wave propagation characteristics. Multidomain morphologies of the monolayers were imaged by epi-fluorescence microscopy and they were found to differ according to the method of monolayer mass density variation, i.e., the successive addition and step-wise compression. © 1996 John Wiley & Sons, Inc.
Start page
3025
End page
3034
Volume
34
Issue
17
Language
English
OCDE Knowledge area
Ciencia de los polímeros
Scopus EID
2-s2.0-0030421370
Source
Journal of Polymer Science, Part B: Polymer Physics
ISSN of the container
08876266
Sources of information: Directorio de Producción Científica Scopus