PP/BaSO4 复合材料的制备及性能的研究

In this paper,polypropylene (PP) as a general plastics brittle difference problem,using inorganic nanoparticles BaSO4 strengthening and toughening modification of PP,in order to produce good toughness of PP material.By melt blending,extrusion,pressing,punching sheet specimen,determination of properties and rheological properties of samples mechanics,affect the performance of different content of BaSO4 on composite material.With the help of melt flow rate instrument (MFR),scanning electron microscopy (SEM),modern testing means such as DSC-TGA of PP/BaSO4 composite melt viscosity,tensile strength,impact strength and morphology.The results show that:adopting the water cooling method can significantly improve the dimensional stability of the composite products,greatly reduced the crystallinity of PP,improve the strength and toughness of a material; melt index test shows that,with the increase of BaSO4 content,PP/BaSO4 processing and molding temperature lower than the melting temperature of PP.SEM observation showed that,BaSO4 has good dispersion in the PP matrix,has good interface and PP; mechanical property testing shows that,with the increase of BaSO4 content the tensile strength and impact strength of the composite increased first and then decreased.Thermogravimetric analysis showed that the initial decomposition temperature of PP/BaSO4 composites decreased with increasing the BaSO4 content.With the increase of BaSO4 content,the PP/BaSO4 composite specimens weight loss rate showed a gradually decreasing trend.Obtained by several groups of experiment:when the content of BaSO4 is 5%,you can get PP/ BaSO4 composite material with good comprehensive properties.