HDPE/clay hybrids: the effect of clay modified with poly(diphenylsiloxanes) on thermal and rheological properties

MONASTERIO, F.E.; PITA, V.J.R.R; DIAS, M.L.; CARRERA, M.C.; ERDMANN, E.; DESTÉFANIS H. A.

Foz de Iguazú – BRASIL

Congreso; 10° CBPol; 2009

Associação Brasileira de Polímeros.

Poly(diphenylsiloxanes) (PDPhS) were synthesized in presence of organophilic clay in order to modify itsnanostructure. Two silane monomers were used: dimethoxydiphenylsilane and dichlorodiphenylsilane. The followingcharacterizations were performed for all clays: XRD, FTIR and TGA/DTG. These siloxane-modified clays were morehydrophobic and had enhanced thermal stability. Solvent extraction was carried out in the siloxane-modified clays andthe PDPhS soluble fraction analyzed according the molecular weight via GPC. The presence of free and graftedoligomers on clay surface was identified. The modified clays were added to HDPE by melt processing to obtainHDPE/clay hybrids which exhibited marked differences in the rheological behavior when compared with neat HDPE.