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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Influence of water on electrical and mechanical properties of self-assembled and self-healing PEM films

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Gaal, Gabriel [1] ; Jimenez, Mawin J. M. [1] ; Alvarez, Fernando [1] ; Rodrigues, Varlei [1] ; Riul Jr, Antonio
Total Authors: 5
[1] Univ Estadual Campinas, Dept Fis Aplicada, Campinas - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Progress in Organic Coatings; v. 150, JAN 2021.
Web of Science Citations: 0

Self-healing coatings as thin films have been widely exploited in the last decade due to the conformational ability to adhere practically at any surface, bringing multiple regenerations in damaged areas. Poly(ethylene imine) (PEI) and poly(acrylic acid) (PAA) are the most used polyelectrolytes to grow self-healing layer-by-layer films; however, few studies have been dedicated to evaluate the role of water on the electrical and mechanical properties of the films. Multilayered (PEI/PAA) structures were easily self-assembled on various substrates, allowing homogeneous and semi-transparent coverages. We associate the exponential and linear growth regimes of (PEI/PAA) with changes in the electrical characteristics acquired after each step of the film formation. We demonstrated the central role of trapped water on the space charge accumulation at polymer/electrode interface, due to the presence of negative differential resistance regions, and the transition of the charge transport to a space charge regime after a critical potential. We have also investigated changes in the mechanical properties, showing the influence of trapped water in the film elastic modulus, wear resistance, and resistance to plastic deformation. (AU)

FAPESP's process: 19/18460-4 - Synthesis, thermo-mechanical and tribological properties of advanced multicomponent materials of high entropy
Grantee:Fernando Alvarez
Support type: Regular Research Grants
FAPESP's process: 17/19862-3 - Study of nanostructured conducting and self-healing films for flexible electronics application
Grantee:Gabriel Gaál
Support type: Scholarships in Brazil - Doctorate