Abstract
Temperature dependences of dynamic moduli of polypropylene filled with flame retardant Mg(OH)2 or with CaCO3 were investigated. The filler content varied from O to 50 vol% and both storage (G′) and loss (G″) shear moduli were measured from + 50 to + 300 °C at frequencies 1 and 90 Hz. The influence of the filler particle shape was dominant for the origin of the physical network. Chemical adhesion aid was superfluous in composites with subcritical particle size. Two step decrease of G′ and two peaks on G″ temperature dependences were observed above the critical filler concentration. The explanation of this phenomenon was based on the proposal that polypropylene immobilized on the filler surface creates a new continuous phase, while primary polypropylene exists only in separated domains. Destruction of the physical network was explained using results of thermoanalysis, providing the catalytic effect of Mg(OH)2 on the thermal oxidation of polypropylene in the interlayer above 240 °C.
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Jančář, J., Kučera, J. & Veselý, P. Peculiarities of mechanical response of heavily filled polypropylene composites. J Mater Sci 26, 4883–4887 (1991). https://doi.org/10.1007/BF00549865
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DOI: https://doi.org/10.1007/BF00549865