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Polyelectrolyte multilayer films under mechanical stretch.

Damien Mertz¹, Joseph Hemmerlé¹, Fouzia Boulmedais²

¹Institut National de la Santé et de la Recherche Médicale, INSERM Unité 595, 11 rue Humann, 67085 Strasbourg Cedex, France. philippe.lavalle@medecine.u-strasbg.fr and Université Louis Pasteur, Faculté de Chirurgie Dentaire, 1 Place de l'Hôpital, 67000 Strasbourg, France.

|September 9, 2020

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This study explores polyelectrolyte multilayers

Area of Science:

Materials Science
Polymer Science
Nanotechnology

Background:

Polyelectrolyte multilayers (PEMs) are versatile materials for fabricating functional films.
PEMs can be engineered to respond to external stimuli, such as mechanical stress.
Understanding PEM behavior under mechanical deformation is crucial for designing advanced materials.

Purpose of the Study:

To investigate the mechanical response and structural integrity of different PEMs under stretching.
To compare the film-forming and barrier properties of various PEM combinations.
To evaluate the potential of PEMs as mechanically responsive barriers.

Main Methods:

Fabrication of three distinct PEM systems: poly(allylamine)/poly(styrene sulfonate) (PAH/PSS), poly(diallyldimethylammonium)/poly(styrene sulfonate) (PDADMA/PSS), and poly(-lysine)/hyaluronic acid (PLL/HA) on silicone substrates.

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Mechanical testing involving stretching to assess film integrity and deformation mechanisms.

Characterization of barrier properties using PEMs as capping layers on a functional compartment.

Main Results:

PAH/PSS films exhibited brittleness and cracking under low elongation, behaving like glasses.
(PLL/HA) and (PDADMA/PSS) films demonstrated gel-like behavior and remained undamaged under stretch.
(PSS/PDADMA) capping layers formed reversible nanopores upon stretching, enabling tunable barrier properties, while (PSS/PAH) layers formed larger cracks with incomplete sealing upon relaxation.

Conclusions:

The choice of polyelectrolytes significantly influences the mechanical response and structural stability of PEMs.
(PDADMA/PSS) and (PLL/HA) multilayers offer robust mechanical properties suitable for demanding applications.
(PSS/PDADMA) multilayers show promise as dynamically tunable, self-healing barriers for controlled release or filtration.