Abstract
Fillers suppressed the temperature dependence of storage modulus and caused the flattening of the temperature dependence of the loss modulus in the glass transition region of polypropylene (PP). The glass transition temperature (Tβ) of PP did not change with filler content (vf). This indicates that none of the fillers affect the mobility of PP in the bulk. A new loss maximum appeared at 50 °C forvf>0.2. This maximum became more prominent when increasing either the filler content or filler specific surface area. Interparticle interactions, leading to the space network of weakly bonded particles, affected PP mobility indirectly. The enhanced interfacial adhesion led to a further decrease of PP mobility nearTβ and to the increase of the new loss maximum at 50 °C.
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