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

Barrier properties of high performance PMMA-silica anticorrosion coatings

Full text
Author(s):
Trentin, Andressa [1] ; Gasparini, Andressa de L. [1] ; Faria, Flavio A. [1] ; Harb, V, Samarah ; dos Santos, Fabio C. [2] ; Pulcinelli, Sandra H. [2] ; Santilli, V, Celso ; Hammer, Peter [3]
Total Authors: 8
Affiliation:
[1] Sao Paulo State Univ UNESP, Inst Chem, BR-14800060 Araraquara, SP - Brazil
[2] Harb, Samarah, V, Sao Paulo State Univ UNESP, Inst Chem, BR-14800060 Araraquara, SP - Brazil
[3] Santilli, Celso, V, Harb, Samarah, V, Sao Paulo State Univ UNESP, Inst Chem, BR-14800060 Araraquara, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Progress in Organic Coatings; v. 138, JAN 2020.
Web of Science Citations: 4
Abstract

This work reports a detailed investigation of the structural and electrochemical barrier properties of PMMA-silica coatings. Hybrid nanocomposites were prepared by combining the sol-gel method with the polymerization of methyl methacrylate (MMA), using the thermal initiator benzoyl peroxide (BPO), followed by the hydrolytic condensation of tetraethoxysilane (TEOS) and 3-(trimethoxysilyl)propyl methacrylate. Raman spectroscopy and thermal analysis showed that the fine-tuning of the BPO amount, a critical synthesis parameter, improved the polymerization efficiency of MMA, leading to a highly cross-linked hybrid structure. The homogeneous coatings prepared under optimized synthesis conditions presented elevated thermal stability due to improved polymerization of the organic phase. Electrochemical impedance spectroscopy (EIS) showed a quasi-ideal capacitive impedance response in 3.5% NaCl solution, with low frequency impedance modulus of up to 10 G Omega cm(2), which remained essentially unchanged during 19 months of immersion. This notable barrier property was modeled by fitting the EIS curves assuming slowly expanding electrolyte uptake, using the two-layer Young approach, and by comparison with the standard equivalent electrical circuit (EEC/CPE) model. The Young model provided valuable information on the time evolution of physical parameters including the thickness of the uptake zone, the conductivity depth-profile and the dielectric constant, among others, evidencing the high performance of the coatings. (AU)

FAPESP's process: 15/11907-2 - Structure and electrochemical properties of PMMA-silica hybrid coatings modified with cerium and lithium ions.
Grantee:Andressa Trentin
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 15/09342-7 - Development of multifunctional PMMA- (TiO2, ZrO2 and CeO2)hybrids
Grantee:Samarah Vargas Harb
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 14/12182-9 - Mechanical analysis by nanoindentation, microscratch and wear tests of anticorrosive siloxane-PMMA hybrid coatings reinforced by carbon nanotubes and graphene
Grantee:Samarah Vargas Harb
Support Opportunities: Scholarships abroad - Research Internship - Master's degree