Influence of TiO₂ nanoparticles on nonisothermal crystallization of PP in a wide range of cooling rates analyzed by fast scanning DSC

Abstract

The influence of titanium dioxide (TiO 2 ) nanoparticles on the crystallization behavior of polypropylene was investigated by conventional differential scanning calorimetry (DSC) and fast scanning DSC measurements. The data obtained from both methods were estimated for the first time using the Lauritzen-Hoffmann equation to analyze the behavior over a wide cooling range under nonisothermal conditions. This provides more reliable values of nucleation parameters (K g ) and surface free energy (r e ). The variation of the effective energy (DE) was determined with the Kissinger method. Regardless of the cooling rate, both K g and r e indicate the role of titania as a nucleating agent enhances the crystallization rate. However, the DE denotes that TiO 2 acts as an obstacle to the mobility of chain segments at cooling rates below 150 8C/s, while, in contrast, the presence of titania enhances the chain mobility at cooling rates above 150 8C/s.

Correlation between morphology and electrical breakdown strength of the polypropylene/maleic anhydride grafted polypropylene/nano‐ZrO2 ternary system

“…Especially for capacitors, the most widely used energy storage equipment in power systems, the higher DC breakdown strength means a higher energy storage density since the capacitor is charged with a DC source. For such problems, nanocomposites are considered to be a very promising solution to enhance the breakdown strength of polymer insulation dielectrics . For instance, Jiang etal .…”

The importance of local process conditions on the properties of fused filament fabrication printed polypropylene components

“…10 In contrast to conventional fabrication, the printed parts are far from homogeneous due to the local flow condition and thermal gradients. 15,17,18 The complex features of the FFF, especially the local conditions during the formation of the welding line, such as thermal history [23][24][25] and shear stress, 26 play a vital role in the final properties of the components. The interfacial bonding between the adjacent strands is thermally driven and affects the morphology and ultimately the mechanical properties.…”