Influence of filler on the polypropylene structure
The nucleating effect of different kinds of fillers in polypropylene composite materials were studied using a dilatometric method and the composites were examined by scanning electron microscopy to relate the composite structure to physical properties. Filler concentration was varied for each composite.
A positive influence due to the nucleating effect, of the incorporated fillers on the polypropylene structure, was achieved only with low bentonite concentrations. For all types of filler employed, an increase in the filler content raises the rate of crystallization, reduces the crystalline phase content, and diminishes the size of supermolecules formed. Particle size and concentration of filler influence the physical properties of polypropylene. In highly filled composites agglomerates are formed and disintegration of filler particles occurs as a result of intensive mechanical strain.
Key wordsPolyolefins nucleating agent crystallinity filler
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