Synergies among the self-assembled β-nucleating agent and the sheared isotactic polypropylene matrix

Exploring the polymorphic behavior of a β‐nucleated propylene‐ethylene random copolymer under shear flow

“…The suppression effect of shear flow on the formation of β crystals in the β ‐nucleated iPP samples has been reported . However, the combination of shear‐induced β nuclei and β ‐NA induced nucleation makes it difficult to reveal the effects of shear flow on the nucleation and growth of β crystals.…”

Suppression of the hierarchical structure of water-assisted injection moulded iPP in the presence of a β-nucleating agent and lamellar branching of a β-crystal

“…But, on one hand, it has been reported that the b-from spherulite grows epitaxially on the b-from crystal; 15 on the other hand, the lamellae grow perpendicular to the surface of NAs has been observed, especially for the needle-like NAs. [16][17][18] In our case, the WBG can be self-assemble into various aggregates, such as needle and snowake-like. 10,18 Therefore, the appearance of six-arcs can be related to the epitaxial growth of b-crystal induced by b-NA with various self-assembled aggregates.…”

Nucleating agents based on graphene and graphene oxide for crystallization of the β-form of isotactic polypropylene

“…The b-form, with the unit cell parameters: a = b = 1.101 nm, c = 0.65 nm, a = b = 90°and c = 60° [5], is formed under special crystallization conditions [6,7]. The methods of preparation of the b-form described in the literature include: crystallization after quenching to a certain temperature range [8], crystallization in a specific temperature gradient [9], crystallization of melt subjected to shear or elongation [10,11] or crystallization in the presence of selective b-nucleating agents (b-NA) [4]. The last method, based on the application of selective b-NA, is the most convenient and reliable.…”