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Composites from functionalized polyolefins and silica
Author(s) -
Passaglia E.,
Bertuccelli W.,
Ciardelli F.
Publication year - 2001
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200112)176:1<299::aid-masy299>3.0.co;2-r
Subject(s) - electron paramagnetic resonance , polyolefin , wetting , materials science , natural rubber , ethylene propylene rubber , precipitated silica , filler (materials) , composite material , solvent , chemical engineering , polymer chemistry , polymer , chemistry , organic chemistry , copolymer , physics , nuclear magnetic resonance , layer (electronics) , engineering
The effect of diethyl maleate (DEM) units grafted to the polyolefins on the compatibility with inorganic fillers has been investigated. Ethylene‐propylene rubber functionalized with DEM (EPR‐g‐DEM) was mixed with silica in different weight ratios using a Brabender mixer (Plastograph), by comparing analogous mixtures prepared starting with unmodified ethylene‐propylene‐rubber (EPR) and silica. The Torque traces showed that the diethyl maleate grafted on the EPR significantly changed the interfacial interaction between the silica surface and the EPR during the mixing process. Incorporation of silica into either EPR and EPR‐g‐DEM by mechanical mixing produced a fraction of insoluble by association with the filler ( bound rubber ), as revealed by the solvent extraction technique. Bound rubber evaluations pointed out the major capability of the EPR‐g‐DEM to interact with the mineral surface. In this case specific interactions involving the carbonyl groups of the functionalized polyolefin and the polar sites on the filler surface have been identified by means of FT‐IR spectroscopy. As revealed by SEM observations, these specific interactions at the interface promote the mutual wettability and adhesion of the components in EPR‐g‐DEM/silica composites.