physica status solidi (a) · 1994 · 28 citations · 9 references
Natural SciencesMaterials EngineeringMaterials ScienceMaterials CharacterizationPolymer ChemistryPolymer MaterialsComposite MaterialsPolymer CharacterizationPolymer CompositesPolymer NanocompositesPolymer PhysicsPolymer StructureFree VolumeHigh-density Polymer CompositesMechanical Properties Of NanocompositesNanocomposite PolymersPolyethyleneStructural NanocompositesStructural Polymer CompositesTensile Strength
The results of positron lifetime measurements as a function of volume fraction Φv of CaCO3 particles on the high density polyethylene/CaCO3 (HDPE/CaCO3) polymer composites with and without addition of a coupling agent are presented. It is observed that, first, positronium (Ps) is formed and annihilates in the free-volume hole of HDPE and the free-volume concentration decreases with increasing Φv; second, the positron lifetime τ2 and its intensity I2 are strongly affected by the structure of the interface layer between CaCO3 particle and HDPE matrix. An interesting correlation between positron parameters and the tensile strength of the composites is found.
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