Compatibilizing effect of maleated polypropylene on the mechanical properties and morphology of injectin molded polyamide 6/polypropylene/organoclay nanocomposites

摘要

Polyamide 6/polypropylene (PA6/PP=70/30 parts)blends containing 4 phr (parts per hundred resion)of organophilic modified montmorillonite (organoclay)were prepared using twin screw extruder followed by injecgin moleding.Maleated polypropylene (MAH-g-PP)was used to compatibilize the blend system.The mechanical properties of PA6/PP nanocomposites were studied through tensile and flexural tests.Scanning electron microscopy (SEM)and transmissin electon microscpy (TEM)were used to assess the fracture surface morphology and the dispersion of hte organoclay,respectively.X-ray diffraction (XRD)was used to characterized the formation of nanocomposites.The tehrmal properaties were characterized by usign differential scanning calorimetry (DSC)and thermogravimetric analysis (TGA).The dynamic mechanical properties of PA/PP nanocomposites were analyzed by using dyamic mechanical thermal analyzer (DMTA).The strength and stiffness of PA6/PP nanocomposites were analyzed by using dynamic mechanical thermal analyzer(DMTA).The strength and stifness of PA6/pp nanocomposites were improved significantly in the presence of MAH-g-PP.This bas been attributed to the synergistic effect of ogranoclay and MAH-g-PP.The MAH-g-PP compatibilized PA6/PP nanocomposites showed a homogeneous morphology supporting the compatibility improvement between PA6,PP and organoclay.Tem and XRD results revealed the formation of nanocomposites as the organoclay was interaclated and exfoliated.A spossible chemical interation between PA6,PP,organophilic modified montmorillonite and MAH-g-PP was proposed based on the experimental work.