Thermal and rheological properties of polyethylene composites based on poly(diphenylsiloxanes)/organoclay hybrids obtained from two different silanes

MONASTERIO, F.E.; LOPES DIAS, M.; RODRIGUEZ PITA, V.J.R.; ERDMANN, E.; DESTÉFANIS, H.A.

MACROMOLECULAR SYMPOSIA

WISLEY

Año: 2010

1022-1360

 Poly(diphenylsiloxanes) (PDPhS) were synthesized in presence oforganophilic clay in order to modify its nanostructure. Two silane monomerswere used: dimethoxydiphenylsilane and dichlorodiphenylsilane. Thefollowing characterizations were performed for all clays: XRD, FTIR,TG/DTG and SEM. These siloxane-modified clays were more hydrophobicand had enhanced thermal stability. Solvent extraction was carried out in thesiloxane-modified clays and the PDPhS soluble fraction analyzed accordingthe molecular weight via GPC. The presence of free and grafted oligomers onclay surface was identified. The modified clays were added to high densitypolyethylene (HDPE) by melt processing to obtain HDPE/hybrid claycomposites which exhibited marked differences on macroscopic propertieswhen compared with neat HDPE.