fracture behaviour, fractography, particulate-filled polymer composites Why is there a smooth fractured surface of unfilled LDPE with a very large strain to fracture when compared with filled LDPE composites?
Maybe the size of the filler's particles is too large. If so - the strain-to-break of composite material - must become lower than that of neat matrix (LDPE)
Dear Jimmy, of course, filling increases the modulus of elasticity, tensile stress and strength as well as reduces ultimate strain of sample made of composite in comparison wth characteristics of pure LDPE.
As a rule, the size of supramolecular structural element of pure LDPE is less than in filled one; this is a reason of "rough' failure surface of composite. But in case of nanofillers, which having the same scale as structural element, the situation may be another. Serge
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