PP/TLCP/GLASS FIBER HYBRID COMPOSITES Ⅱ : TENSILE AND DYNAMIC MECHANICAL PROPERTIES OF HYBRID COMPOSITES

The tensile test and dynamic mechanical analysis (DMA) were conducted to investigate the mechanical properties of polypropylene/thermotropic liquid crystalline polymer/glass fiber (PP/TLCP/GF) hybrid composites with a good TLCP fibrils structure.The tensile test results show that the tensile strengths and moduli of hybrid composites increase with increasing drawing ratio after the extrusion of PP and TLCP.The hybrid composites compatibilized with PP-g-MAH have more excellent mechanical properties than the systems without the compatibilizer.The DMA results show that the dynamic storage moduli of hybrid composites increase with the increase of glass fiber content.The storage moduli, e.g.the rigidity of hybrid composites, increase further after the introduction of PP-g-MAH as the compatibilizer.Whether using PP-g-MAH as the compatibilizer or not, the increase of the storage moduli slows down after the glass fiber content reached 20% (mass fraction).The peak value of tanδ of the matrix decreases with increasing glass fiber content.The addition of PP-g-MAH as the compatibilizer also decreases this value after the modification of the interfacial adhesion between the matrix and reinforcing phase.