Evidence of interaction of fillers with matrix polymers via transition maps

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Abstract
Surface modifications of fillers can be detected via dielectric relaxation spectroscopy with surface coatings that interact with the matrix polymer resulting in higher glass transition temperatures of the matrix polymer. Increasing the surface area of filler present by increasing the amount of filler systematically shifts the glass transition temperature of the matrix polymer to higher values. Increasing the surface area of the filler by making the surface microporous improves many mechanical properties but may not immobilize as many matrix polymer molecules if a weak boundary layer is present.