@article{article_287861, title={Mechanical, physical and morphological properties of acidic and basic pumice containing polypropylene composites}, journal={Sakarya University Journal of Science}, volume={22}, pages={333–339}, year={2018}, DOI={10.16984/saufenbilder.287861}, author={Tayfun, Ümit and Kanbur, Yasin}, keywords={Polypropylene,Pumice,Surface Modification,Composite Materials}, abstract={<p class="zet" style="line-height:normal;"> <span lang="tr" style="font-size:12pt;" xml:lang="tr">Acidic pumice (AP) and basic pumice (BP) were
compatibilised with the polymer matrix by using silane coupling agents before
their addition into polypropylene (PP). In addition, composites with maleic
anhydride grafted polypropylene (Ma-g-PP) were prepared. Composites were
prepared by melt-blending method using lab-scale twin screw extruder which is
the most suitable method for the large scale production. PP composites that
obtained as chip form from the mixer were shaped with injection molding.
Additionally to the mechanical properties of prepared composites, water
absorption test of the composites were performed in order to investigate their
outdoor usage conditions.  Tensile test,
dynamic mechanical analysis (DMA) and melt flow index tests were applied to composites,
respectively. Furthermore, scanning electron microscopy (SEM) micrographs were
examined for observation of the dispersion of pumice particles into
polypropylene matrix. Improvements in mechanical properties of composites were
obtained by using silane-modified acidic pumice, basic pumice and MA-g-PP.
According to SEM micrographs, composites which contain silanized pumice and
MA-g-PP exhibit better dispersion of pumice particles into PP matrix due to
compatibilazition of particles with polymer surfaces. There were no remarkable
changes observed for the melt flow values of especially acidic pumice
containing composites as compared with PP. 
This results support the conclusion that the addition of pumice caused
no obvious problem for the processibily of polypropylene in large scale
applications. </span> </p> <p> </p>}, number={2}, publisher={Sakarya University}