Melt rheology and extrudate swell of titanium (IV) oxide nanoparticle-filled isotactic polypropylene: Effects of content and surface characteristics

Efficient Rhodium‐Catalyzed Installation of Unsaturated Ester Functions onto Porphyrins: Site‐Specific Heck‐Type Addition versus Conjugate Addition

“…The primary aim of the work reported in this article was to obtain a deeper understanding of the influence of interfacial agent content on the rheological behaviour and crystalline characteristics exhibited by iPP/TiO 2 nanocomposites with biocidal properties. These iPP/TiO 2 hybrids are rather different from those previously reported,32, 33 because of their extraordinary germicidal capability and because of the presence of a third individual component (the compatibilizer), the method used for their preparation and the initial size of the TiO 2 nanoparticles, among other variables. In order to verify if TiO 2 incorporation may induce significant changes in iPP processability and affect the final properties of the resulting materials, the evaluation of their rheological properties in the melt is of major importance.…”

“…By contrast, those authors also found that regular blends of the same iPP with commercially available anatase TiO 2 particles (average particle size of 525 nm) for a similar composition range do show a regular terminal zone. Dangtungee and Supaphol33 studied the melt rheology and extrudate swell of iPP/TiO 2 composites prepared with commercially available rutile‐type TiO 2 nanoparticles with different surface characteristics (neat, SiO 2 ‐coated and stearic acid‐coated) in proportions ranging from 5 to 30 wt%. They found slight to moderate increase in viscosity and lesser degree of extrudate swelling depending on the concentration of TiO 2 particles and their surface characteristics.…”

Melt shear viscosity of PP/Al(OH)3/Mg(OH)2 flame retardant composites at high extrusion rates

“…It has, therefore, received extensive attention in the past two decades. [15][16][17][18] In a study on rheological properties of calcium silicate-filled isotactic PP, Maiti et al 19 found that the apparent melt viscosity of the composites decreased until a critical filler volume content of 8.5% was reached. However, with further increase in calcium silicate concentration, apparent melt viscosity increased.…”

Synthesis and properties of polyethylene/TiO2 nanocomposites using a vanadium catalyst

“…Finally, the product was ground into a fine powder. [27] The average particle size of produced nanofillers was less than 100 nm. The samples were denoted as TiO 2 /Fe for iron-doped titania.…”