PSI - Issue 17

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 il l li t . i ir t. i i tructural Integrity rocedia 00 (2019) 000 – 000

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Procedia Structural Integrity 17 (2019) 857–864

ICSI 2019 The 3 rd International Conference on Structural Integrity Oxidative Treatment of Multi-Walled Carbon Nanotubes and its Effect on the Mechanical and Electrical Properties of Green Epoxy based Nano-Composites Anurag Singh a , Carmen Sguazzo a* , Carlos F.R.A.C. Lima b , Luis M.N.B.F. Santos b , Jorge Matos Reis c , Pedro M. G. P. Moreira a , Paulo J.S. Tavares a a Laboratory of Optics and Experimental Mechanics (LOME), Institute of Science and Innovation in Mechanical and Industrial Engineering (INEGI), University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal b Department of Chemistry and Biochemistry, Faculty of Science of University of Porto, R. Campo Alegre, 687, 4169-007 Porto, Portugal c Department of Mechanical Engineering, Faculty of Engineering of University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal Abstract Oxidative treatment of Multi-Walled Carbon Nanotubes (MWCNT’s) was done by chemical functionalization by using the mixture acid, which is a mixture of sulfuric acid (H 2 SO 4 ) and nitric acid (HNO 3 ). Functionalization was governed by four parameters namely mixture acid concentration, temperature(T), time of heating(t) and the amount of MWCNTs used. After functionalization, functionalized MWCNT’s were then diluted in dimethylformamide (DMF) to analyse the percentage of soluble MWCNT’s. Also, by increasing the time of functionalization, it was observed that overall yield decreases but the percentage of functionalized product inside the yield quantity remains the same. Material characterization was also carried out at several steps to validate this theory. Chemical functionalization of MWCNT’s is generally significant for the manufacturing of polymer-based nanocomposites. Oxidative treatment enhances the dispersion and interfacial bonding within the epoxy matrix. In this research work, a bio-based epoxy resin was selected for the manufacturing of nanocomposite samples with various concentrations of pristine and functionalized MWCNTs. Mechanical and electrical characterization was finally carried out to increase the knowledge on the interaction of MWCNT’s with the selected green epoxy matrix system and their I I 2 1 Th rd I t r ti l f r tr t r l I t rit i a , men a* , l . . . . i b , i . . . . t b , Matos Reis c , Pedro M. G. P. Moreira a , Paulo J.S. Tavares a a aboratory of ptics and xperi ental echanics ( ), Institute of Science and Innovation in echanical and Industrial ngineering (I I), niversity of orto, ua r. oberto rias, 4200-465 orto, ortugal b epart ent of he istry and ioche istry, aculty of Science of niversity of orto, . a po legre, 687, 4169-007 orto, ortugal c epart ent of echanical ngineering, aculty of ngineering of niversity of orto, ua r. oberto rias, 4200-465 orto, ortugal str ct i ti tr t t f lti- ll r t s ( ’s) s i l f ti li ti si t i t r i , i is i t r f s lf ri i ( 2 4 ) itri i ( 3 ). ti li ti s r f r r t rs l i t r i tr ti , t r t r ( ), ti f ti (t) t t f s s . ft r f ti li ti , f ti li ’s r t il t i i t lf r i ( ) t l s t r t f s l l ’s. ls , i r si t ti f f ti li ti , it s s r t t r ll i l r s s t t r t f f ti li r t i si t i l tit r i s t s . t ri l r t ri ti s ls rri t t s r l st s t li t t is t r . i l f ti li ti f ’s is r ll si ifi t f r t f t ri f l r- s sit s. i ti tr t t s t is rsi i t rf i l i it i t tri . I t is r s r r , i - s r si s s l t f r t f t ri f sit s l s it ri s tr ti s f risti f ti li s. i l l tri l r t ri ti s fi ll rri t t i r s t l t i t r ti f ’s it t s l t r tri s st t ir

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* Corresponding author. * orresponding author.

Tel.: +351 229578710; fax: +351 229537352. E-mail address: csguazzo@inegi.up.pt el.: 351 229578710; fax: 351 229537352. - ail address: csguazzo inegi.up.pt

1. Introduction Carbon based nanoparticles have raised much interest during the recent years due to their inherent extraordinary electrical and mechanical properties (Chu et al. 2012; Guo et al. 2014; White and Sue 2011). Among these carbon based nanoparticles, carbon nanotubes were discovered in the year 1991 by Iijima (Iijima 1991). Carbon nanotubes . I tr cti r s rti l s r is i t r st ri t r t rs t t ir i r t tr r i r l tri l i l r rti s ( t l. ; t l. ; it ). t s r - s rti l s, r t s r is r i t r Iiji (Iiji ). r t s

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2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 10.1016/j.prostr.2019.08.114