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Mechanical analysis by nanoindentation, microscratch and wear tests of anticorrosive siloxane-PMMA hybrid coatings reinforced by carbon nanotubes and graphene

Grant number: 14/12182-9
Support Opportunities:Scholarships abroad - Research Internship - Master's degree
Effective date (Start): August 01, 2014
Effective date (End): November 30, 2014
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
Principal Investigator:Peter Hammer
Grantee:Samarah Vargas Harb
Supervisor: Kevin M. Knowles
Host Institution: Instituto de Química (IQ). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil
Research place: University of Cambridge, England  
Associated to the scholarship:13/04314-0 - Development of siloxane-PMMA coatings reinforced by carbon nanotubes and graphene for anticorrosive applications, BP.MS


Siloxane-PMMA hybrids coatings with addition of carbon nanotubes and graphene has been synthesized with the objective to obtain a siloxane-PMMA (polymethylmethacrylate) system that combines the properties of high transmission in the visible region, elevated electrical conductivity, high mechanical strength, thermal stability and excellent anticorrosion characteristics. The carbon nanotubes were dispersed using a surfactant to separate the nanotubes bundles and they were added to the inorganic phase. The graphene oxide was dipersed in the inorganic phase and at the end of the synthesis ascorbic acid was added to reduce the graphene oxide to graphene. It was observed that in the hybrids containing both graphene and carbon nanotubes the carbon nanostructures are well dispersed in the siloxane-PMMA matrix, which ensures the formation of a homogeneous nanocomposite. The thermal, electrical, structural, optical and electrochemical analyses of the coatings have been performed at the Chemistry Institute (UNESP) and will be presented in the annual report. During the intership at the University of Cambridge the mechanical properties of modified hybrids coatings deposited on carbon steel will be investigated using nanoindentation, microscratch and wear tests. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
TRENTIN, ANDRESSA; GASPARINI, ANDRESSA DE L.; FARIA, FLAVIO A.; HARB, V, SAMARAH; DOS SANTOS, FABIO C.; PULCINELLI, SANDRA H.; SANTILLI, V, CELSO; HAMMER, PETER. Barrier properties of high performance PMMA-silica anticorrosion coatings. Progress in Organic Coatings, v. 138, . (15/11907-2, 15/09342-7, 14/12182-9)
HARB, SAMARAH V.; PULCINELLI, SANDRA H.; SANTILLI, CELSO V.; KNOWLES, KEVIN M.; HAMMER, PETER. A Comparative Study on Graphene Oxide and Carbon Nanotube Reinforcement of PMMA-Siloxane-Silica Anticorrosive Coatings. ACS APPLIED MATERIALS & INTERFACES, v. 8, n. 25, p. 16339-16350, . (14/12182-9, 13/04314-0)

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