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 type: 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 researcher: Peter Hammer
• Grantee: Samarah Vargas Harb
• Supervisor abroad: Kevin M. Knowles
• Home 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

Abstract

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)

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, JAN 2020. Web of Science Citations: 4.

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, JUN 29 2016. Web of Science Citations: 14.