TY - JOUR
T1 - In-situ growth of nucleus geometry to dual types of periodically ringed assemblies in poly(Nonamethylene terephthalate)
AU - Woo, Eamor M.
AU - Tu, Chien Hua
AU - Nagarajan, Selvaraj
AU - Lugito, Graecia
N1 - Funding Information:
Funding: This work was financially supported by a basic research grant (MOST-110-2811-E-006-509-MY2) for two consecutive years from Taiwan Ministry of Science and Technology (MOST), to which the authors express their gratitude.
Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2021/11
Y1 - 2021/11
N2 - Monitoring of nucleus geometry and growth into dual types of periodically ring-banded morphology in poly(nonamethylene terephthalate) (PNT), respectively, Type-1 and Type-2, are done with detailed analyses using polarized-light optical microscopy (POM) in-situ CCD recording; the periodic assembly morphologies are characterized using atomic-force microscopy (AFM) and scanning electron microscopy (SEM). Different annealing treatments (Tmax = 110, 120, 130◦C) are accomplished at a crystallization temperature of 85◦C; effects on the nucleus geometry, number (25–10%) and volume fractions (33–15%) of Type-2 among two types of banded PNT spherulites are expounded. Growth of a specific type of periodically banded PNT spherulite is initiated from either highly elongated sheaf-like or well-rounded nuclei, with the final grown lamellae being self-packed as multi-shell structures. Nucleation geometry and crystallization parameters collectively lead to development of multiple types of banded PNT spherulites of different relative fractions.
AB - Monitoring of nucleus geometry and growth into dual types of periodically ring-banded morphology in poly(nonamethylene terephthalate) (PNT), respectively, Type-1 and Type-2, are done with detailed analyses using polarized-light optical microscopy (POM) in-situ CCD recording; the periodic assembly morphologies are characterized using atomic-force microscopy (AFM) and scanning electron microscopy (SEM). Different annealing treatments (Tmax = 110, 120, 130◦C) are accomplished at a crystallization temperature of 85◦C; effects on the nucleus geometry, number (25–10%) and volume fractions (33–15%) of Type-2 among two types of banded PNT spherulites are expounded. Growth of a specific type of periodically banded PNT spherulite is initiated from either highly elongated sheaf-like or well-rounded nuclei, with the final grown lamellae being self-packed as multi-shell structures. Nucleation geometry and crystallization parameters collectively lead to development of multiple types of banded PNT spherulites of different relative fractions.
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U2 - 10.3390/cryst11111338
DO - 10.3390/cryst11111338
M3 - Article
AN - SCOPUS:85118924932
SN - 2073-4352
VL - 11
JO - Crystals
JF - Crystals
IS - 11
M1 - 1338
ER -