In-Situ Growth of Nucleus Geometry to Dual Types of Periodically Ringed Assemblies in Poly(nonamethylene terephthalate)

Monitoring of nucleus geometry and growth into dual types periodically ring-banded morphology in poly(nonamethylene terephthalate) (PNT), respectively, Type-1 Type-2, are done with detailed analyses using polarized-light optical microscopy (POM) in-situ CCD recording; the periodic assembly morphologies characterized atomic-force (AFM) scanning electron (SEM). Different annealing treatments (Tmax = 110, 120, 130 °C) accomplished at a crystallization temperature 85 °C; effects on geometry, number (25–10%) volume fractions (33–15%) Type-2 among two banded PNT spherulites expounded. Growth specific type spherulite is initiated from either highly elongated sheaf-like or well-rounded nuclei, final grown lamellae being self-packed as multi-shell structures. Nucleation parameters collectively lead to development multiple different relative fractions.