Dependence of the Morphological Location of the Brittle/Tough Transition on the Modulus of the Dispersed Phase

Authors

  • Asier Zabaleta,

    1. Departamento de Ciencia y Tecnología de Polímeros and POLYMAT Institute, Facultad de Ciencias Químicas, Universidad del País Vasco UPV/EHU, San Sebastián, Spain
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  • Imanol González,

    1. Departamento de Ciencia y Tecnología de Polímeros and POLYMAT Institute, Facultad de Ciencias Químicas, Universidad del País Vasco UPV/EHU, San Sebastián, Spain
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  • José Ignacio Eguiazábal

    Corresponding author
    1. Departamento de Ciencia y Tecnología de Polímeros and POLYMAT Institute, Facultad de Ciencias Químicas, Universidad del País Vasco UPV/EHU, San Sebastián, Spain
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Abstract

The dispersed phase of the polypropylene/maleinized poly(ethylene-octene) (PP/mPEO) blend was modified by means of nanoclay addition, in an attempt to find out the effect of its modulus of elasticity on the location of the brittle/tough (B/T) transition. The nanoclay stayed only in the dispersed rubbery phase upon blending. Upon nanoclay addition, the B/T transition slipped to larger rubber contents; this slip is proposed to be due to the higher modulus of elasticity of the rubbery phase. Looking at the microstructure, the critical interparticle distance (τc) for the B/T transition to occur is less when the dispersed phase is stiffer; i.e., the rubber particles have to be closer to each other for the transition to occur.mame201200454-gra-0001

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