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Tuning of the Elastic Modulus of Polyelectrolyte Multilayer Films built up from Polyanions Mixture

Title data

Trenkenschuh, Katja ; Erath, Johann ; Kuznetsov, Volodymyr ; Gensel, Julia ; Boulmedais, Fouzia ; Schaaf, Pierre ; Papastavrou, Georg ; Fery, Andreas:
Tuning of the Elastic Modulus of Polyelectrolyte Multilayer Films built up from Polyanions Mixture.
In: Macromolecules. Vol. 44 (2011) Issue 22 . - pp. 8954-8961.
ISSN 0024-9297
DOI: https://doi.org/10.1021/ma201974g

Official URL: Volltext

Abstract in another language

In this paper, we report on the mechanical characterization of polyelectrolytes multilayer (PEM) films prepared from poly(glutamic acid)-poly(styrenesulfonate) (PGA-PSS) blends, deposited in alternated spray deposition with poly(allylamine hydrochloride) (PAR). The polyanion composition of the blended film was first investigated by Fourier transformed infrared spectroscopy in the attenuated total reflection mode. The monomer molar fraction of PGA, in the film increases almost linearly with x, i.e., the monomer molar fraction of PGA in the sprayed polyanion solution. The mechanical properties of the blended (PAH/PGA(x)-PSS1-x)(n) film were measured using two methods: (i) the wrinkling metrology method and (ii) by colloidal probe atomic force microscopy. We demonstrate that Young's modulus of the PAH/PGA(x)-PSS1-x multilayer films can be systematically controlled by the chemical composition of these films, depending on x. Measurements indicate that increasing the monomer molar fraction of PGA in the blended film results in a decrease in film modulus up to 2 orders of magnitude as compared to the PAH/PSS system. At a monomer molar fraction of PGA in the film around x = 0.7, this system undergoes such a transition. We also show that for a given x the elastic properties of these films are significantly affected by the humidity conditions. For a (PAH/PGA(0.88)-PSS0.12) film, Young's modulus of the film varies from several hundred to few MPa by solely altering the relative humidity between 12.5 and 80.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors > Chair Physical Chemistry II - Univ.-Prof. Dr. Andreas Fery
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Physical Chemistry II
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 500 Natural sciences
500 Science > 530 Physics
500 Science > 540 Chemistry
Date Deposited: 09 Dec 2014 07:07
Last Modified: 01 Feb 2016 13:30
URI: https://eref.uni-bayreuth.de/id/eprint/3970