HELOISA AUGUSTO ZEN
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Artigo IPEN-doc 24322 Effect of clay incorporation in the dimensional stability of FKM nanocomposite2017 - ZEN, HELOISA A.; LUGAO, ADEMAR B.In this work was studied the effect of nanoparticle incorporation in the dimensional stability of elastomer matrix. To avoid excessive swelling and consequently dimensional instability in the films, crosslinking has been shown to be an efficient and simple method for achieve the reducing membrane swelling and improving mechanical stability. The elastomer used was a fluorinated type, with 70% of fluor in its composition and commercial clay (Cloisite®) was the nanofiller used. The nancomposites with 0.5, 1 or 2% (wt%) of nanoclay were prepared in a open two roll mill. The fluoroelastomer was a type of Viton® (DuPont) which has low fuel permeation and suitable for use as sealant mainly for o-ring production. The incorporation of clay in the polymer matrix aimed to avoid excessive swelling and to maintain the material dimensional stability. The nanocomposites were characterized by stress–strain test to evaluated elongation and tension at break, by rheometry to analyzed maximum and minimum torques, and degree of swelling to follow dimensional size modification of nanocomposites films. There were a decreasing of the elongation at break and of degree of swelling values what can be correlated to an increase of crosslinking, and consequently formation of a networking in the nanocomposites matrix in the films evaluatedArtigo IPEN-doc 22009 Prevention of degradation of 'gamma'-irradiated EPDM using phenolic antioxidants2016 - ZAHARESCU, TRAIAN; ZEN, HELOISA A.; MARINESCU, MADALINA; SCAGLIUSI, SANDRA R.; CARDOSO, ELISABETH C.L.; LUGAO, ADEMAR B.Artigo IPEN-doc 18297 Solvent effect on post-irradiation grafting of styrene onto poly(ethylene-alt-tetrafluoroethylene) (ETFE) films2013 - GERALDES, ADRIANA N.; ZEN, HELOISA A.; RIBEIRO, CEISE; PARRA, DUCLERC F.; LUGAO, ADEMAR B.Artigo IPEN-doc 13118 Effects of solvents on post-irradiation grafting of styrene onto fluoropolymer films2008 - GERALDES, ADRIANA N.; ZEN, HELOISA A.; PARRA, DUCLERC F.; FERREIRA, HENRIQUE P.; LUGAO, ADEMAR B.Artigo IPEN-doc 14090 Post-irradiation time effects on the graft of poly(ethylene-alt-tetrafluoroethylene)(ETFE) films for ion exchange membrane application2010 - GERALDES, ADRIANA N.; ZEN, HELOISA A.; RIBEIRO, GEISE; FERREIRA, HENRIQUE P.; SOUZA, CAMILA P.; PARRA, DUCLERC F.; SANTIAGO, ELISABETE I.; LUGAO, ADEMAR B.Artigo IPEN-doc 18193 Effect of radiation induced crosslinking and degradation of ETFE films2013 - ZEN, H.A.; RIBEIRO, G.; GERALDES, A.N.; SOUZA, C.P.; PARRA, D.F.; LUGAO, A.B.