Nucleation and growth behavior of β-nucleated iPP during shear induced crystallization investigated by in-situ synchrotron WAXS and SAXS

Structure evolution upon heating and cooling and its effects on nucleation performance: A review on aromatic amide β‐nucleating agents for isotactic polypropylene

“…They observed that the iPP specimen containing 0.05 wt% TMB‐5 showed well‐developed spherulites, but the crystallization morphology of iPP containing 0.2 wt% TMB‐5 was bundle‐like. Schneider et al investigated the morphology of NJS in iPP samples with different NA concentrations upon cooling, and found that no NJS crystals could be observed in molten matrix by optical microscopy for the iPP sample nucleated by 0.01 wt% NJS, while in the case of iPP containing 0.03 wt% NJS, the needle structure of NA with the aspect ratio of around 10 would appear in the melt during the cooling. With further increasing the NA concentration to 0.1 wt%, there were a large amount of dispersed NJS granules with no obvious aggregation shape in molten iPP.…”

“…Morphology of β‐nucleating agent at different concentrations in the iPP melt: (A) 0.01, (B) 0.03, and (C) 0.1 wt%; (D) the k β value as a function of time during the quiescent crystallization at 138°C . Adapted with permission from Elsevier …”

Flow-induced crystallization of polypropylene in the presence of graphene nanoplatelets and relevant mechanical properties in nanocompsoite fibres

“…Most of the studies on the flow-induced crystallization have been done on the pure polymers. However, flow-induced crystallization in the presence of nanoparticles is much more complex than that in the pure polymer [29][30][31][32][33][34][35][36]. Since particles disturb the flow filed, a significant effect of presence of particles on the flow-induced crystallization is expected.…”

Effect of multistage sonication on dispersive mixing of polymer nanocomposites characterized via shear‐induced crystallization behavior

“…Nanoparticles can alter the development of crystallinity within polymer nanocomposites by acting as heterogeneous nuclei, increasing the nucleation rate and leading to an increase of crystallinity and decrease of crystallite sizes . While such changes in crystallinity have typically been observed with CNTs under quiescent conditions, it is known that the application of a shear stress to a pure polymer melt at temperatures in the vicinity of the crystallization temperature can lead to the shear‐induced orientation of the macromolecules leading to changes in their crystallization dynamics . Previously it has been investigated how nanoparticle concentration, geometry, and surface/volume ratio may influence the crystallization resulting from shear‐induced crystallization .…”