TY - JOUR
T1 - Unusual Ringed/Dendritic Sector Faces in Poly(butylene succinate) Crystallized with Isomeric Polymer
AU - Tseng, Ya Ling
AU - Chuan, Kai Ning
AU - Woo, Eamor M.
N1 - Funding Information:
This work has been financially supported by research grants (MOST 105-2221-E006-246 and MOST 108-2221-E-006-055) from Taiwan’s Ministry of Science and Technology.
Funding Information:
This work has been financially supported by research grants (MOST 105-2221-E006-246 and MOST 108-2221-E-006- 055) from Taiwan?s Ministry of Science and Technology.
Publisher Copyright:
Copyright © 2020 American Chemical Society.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/4/22
Y1 - 2020/4/22
N2 - Poly(butylene succinate) (PBSu) and poly(ethylene adipate) (PEA), isomeric to each other, are mixed in a miscible state, and PBSu crystallized at Tc's where PEA is kept at a molten state. PBSu upon crystallization in the presence of isomeric PEA at various Tc's develops sector-face spherulitic patterns, which are shown to originate from a common nuclei center. The two faces of sector-face PBSu spherulites are more strikingly contrast when PBSu is highly diluted by isomeric PEA in PBSu/PEA mixtures (PEA = 70-80%) and crystallized at intermediate Tc = 50-60 °C. The main characteristics of crystallized PBSu and lamellar assembly mechanisms in these two faces were investigated using POM, SEM, AFM, and DSC. For both faces (ring-banded vs dendritic) of the sector-face PBSu spherulites, the lamellar assembly mechanism differs, but the growth is similar by repeating with periodic multiplication of fractal branches (whose number is proportional to square of radius) in the next cycle; thus, the lamellae fractal branches not only able to interpret the periodic optical banding but also account for filling the expanding spherulite. This growth mechanism is readily accounted by many fractal patterns in the nature.
AB - Poly(butylene succinate) (PBSu) and poly(ethylene adipate) (PEA), isomeric to each other, are mixed in a miscible state, and PBSu crystallized at Tc's where PEA is kept at a molten state. PBSu upon crystallization in the presence of isomeric PEA at various Tc's develops sector-face spherulitic patterns, which are shown to originate from a common nuclei center. The two faces of sector-face PBSu spherulites are more strikingly contrast when PBSu is highly diluted by isomeric PEA in PBSu/PEA mixtures (PEA = 70-80%) and crystallized at intermediate Tc = 50-60 °C. The main characteristics of crystallized PBSu and lamellar assembly mechanisms in these two faces were investigated using POM, SEM, AFM, and DSC. For both faces (ring-banded vs dendritic) of the sector-face PBSu spherulites, the lamellar assembly mechanism differs, but the growth is similar by repeating with periodic multiplication of fractal branches (whose number is proportional to square of radius) in the next cycle; thus, the lamellae fractal branches not only able to interpret the periodic optical banding but also account for filling the expanding spherulite. This growth mechanism is readily accounted by many fractal patterns in the nature.
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U2 - 10.1021/acs.iecr.9b06098
DO - 10.1021/acs.iecr.9b06098
M3 - Article
AN - SCOPUS:85088920437
SN - 0888-5885
VL - 59
SP - 7485
EP - 7494
JO - Industrial and Engineering Chemistry Research
JF - Industrial and Engineering Chemistry Research
IS - 16
ER -