Die Angewandte Makromolekulare Chemie · 1998 · 10 citations · 0 references
Natural SciencesMaterials EngineeringMaterials SciencePolymer ChemistryPolymer EngineeringPolymer MaterialsNanocompositesPolymer BlendsPolymer CharacterizationPolymer CompoundingPolymer PhysicsPolymer Thin FilmsCrystallizationImpact StrengthInterfacial InteractionsStiffnessToughened PolymersToughness BalanceVolume Fraction EffectsYield Stress
The influence of metallocene-based poly(ethene-co-1-butene) (linear low-density polyethylene; LLDPE) containing 10 wt.-% of 1-butene on the compounding of polypropene (PP) in the presence of polystyrene-block-poly(ethylene-co-1-butene)-block-polystyrene (SEBS) and talcum was studied. With increasing LLDPE and SEBS volume fraction, the stiffness and yield stress of PP decrease, due to the low stiffness and tensile strength of the dispersed components. The low impact strength of PP/LLDPE blends, due to weak interfacial interactions, can be improved significantly by simultaneously blending with SEBS. This is due to the compatibilizer function of SEBS, as demonstrated by transmission electron microscopy. The stiffness of the terblends can be enhanced remarkably by addition of talcum, which also acts as nucleating agent for the PP crystallization. So, a new family of compounds was obtained, exhibiting an improved stiffness/toughness balance.