Peculiarities of mechanical response of heavily filled polypropylene composites
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A concentration dependence of a dynamic storage E′c modulus was investigated for polypropylene filled with microfibrous magnesium hydroxide, Mg(OH)2. The non-monotonous shape of E against filler volume fraction dependence was explained as a consequence of the filler agglomeration.
A simple stochastical model for the dependence of an agglomerate size on the filler volume fraction was developed. A qualitative agreement was obtained between experimental data and proposed theory. A critical filler volume fraction, when an “infinite” agglomerate origins, was determined from the model as well as from percolation conception to be around v f crit = 0.2.
KeywordsPolypropylene Agglomeration Stochastical Model Concentration Dependence Mechanical Response
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