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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.)

A comparative study on PMMA-TiO2 and PMMA-ZrO2 protective coatings

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Harb, V, Samarah ; Trentin, Andressa [1] ; Uvida, Mayara C. [1] ; Magnani, Marina [1] ; Pulcinelli, Sandra H. [1] ; Santilli, V, Celso ; Hammer, Peter [2]
Total Authors: 7
[1] Harb, Samarah, V, Sao Paulo State Univ, UNESP, Inst Chem, BR-14800060 Araraquara, SP - Brazil
[2] Santilli, Celso, V, Harb, Samarah, V, Sao Paulo State Univ, UNESP, Inst Chem, BR-14800060 Araraquara, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Progress in Organic Coatings; v. 140, MAR 2020.
Web of Science Citations: 0

The covalent conjugation between the phases of organic-inorganic nanocomposites and the careful tuning of the proportion of the colloidal precursors are essential to yield homogeneous, cross-linked and dense coatings that are able to protect metallic alloys against corrosion. In this work, the sol-gel route was used to prepare organic-inorganic hybrid coatings based on poly(methyl methacrylate) (PMMA) covalently bonded to TiO2 or ZrO2 nanoparticles through the coupling agent 2-hydroxyethyl methacrylate (HEMA), applied for the first time as anticorrosive coatings for metallic alloy. Different formulations of the hybrids were prepared by varying the proportion of titanium isopropoxide or zirconium propoxide, methyl methacrylate and benzoyl peroxide, and applied on carbon steel by dip-coating. The optimized parameters yielded for the two hybrids transparent and homogeneous coatings, with a thickness less than 3 pm, low surface roughness ( < 1.8 nm) and elevated thermal stability ( > 200 degrees C). Electrochemical impedance spectroscopy assays showed that PMMA-ZrO2 and PMMA-TiO2 coatings exhibit corrosion resistance up to 10 G Omega cm(2), 7 orders of magnitude higher than the bare carbon steel, remaining essentially unchanged for PMMA-TiO2 during 14 days exposure to 3.5 % saline solution. The results suggest that PMMA-ZrO2 and PMMA-TiO2 nanocomposites are suitable for application as environmentally compliant highly efficient anticorrosive 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 type: Scholarships in Brazil - Doctorate
FAPESP's process: 15/09342-7 - Development of multifunctional PMMA- (TiO2, ZrO2 and CeO2)hybrids
Grantee:Samarah Vargas Harb
Support type: Scholarships in Brazil - Doctorate