Tensile properties analysis molding

Very recently, in our group, enhanced self-reinforced PP composites based on commercial PP fabrics were obtained by the film stacking method followed by compression molding introducing different contents of micron-sized quartz particles in the matrix films (unpublished results). Simultaneous improvements of composite tensile strength, ductility and fracture toughness were observed from the addition of quartz to the polymer matrix (Table 14.1). Enhanced degree of consohdation was obtained for the composites with quartz as evidenced from the improved mechanical properties and by SEM observations. This was also confirmed by acoustic emission analysis in situ in tensile tests. 

The mechanical properties of the bulk PET and its nanocomposites were measured by tensile testing on injection-molded microtensile dogbones (ASTM-D638, Type IV) and by dynamic mechanical analysis (DMA) on injection-molded bars. 

Demonstrated tensile modulus of injection-molded bars increases with increasing HBA content (based on three compositions), attributable to orientation differences. Tracked orientation through the cross section using x-ray analysis, elucidating up to nine-layer structure. Modeled mechanical properties based on orientation and layer thickness using Ward s aggregate model. 

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