Periodic Assembly of Polyethylene Spherulites Re-Investigated by Breakthrough Interior Dissection

Selvaraj Nagarajan; Eamor M. Woo

doi:10.1002/marc.202000708

Periodic Assembly of Polyethylene Spherulites Re-Investigated by Breakthrough Interior Dissection

Selvaraj Nagarajan, Eamor M. Woo

Department of Chemical Engineering

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

A completely novel 3D dissection approach is taken to re-investigate high-density polyethylene (HDPE) crystallized into periodic architectures in a wide range of T_c. This work first discovers that ring bands present in HDPE are crystallized in a quite wide T_c range (90–120 °C) all within regime-III growth. With further detailed analyses of the top-surface-relief patterns and 3D architectures of HDPE spherulites, this work has fully clarified the periodic morphology packed with alternate ways of single-crystal aggregates in correlation with the optical banding patterns. The proposed assembly mechanism sheds light that the periodic bands are actually composed of a cross-hatch grating structure in that the alternately perpendicular orientations from the ridge to valley bands being related to the interior radial to tangential lamellae. Such grating architectures in the interiors of HDPE can be viewed as a mimicry resembling shish-kebab lamellae self-aligned by Archimedean spiral-spins from the nucleus center.

Original language	English
Article number	2000708
Journal	Macromolecular Rapid Communications
Volume	42
Issue number	9
DOIs	https://doi.org/10.1002/marc.202000708
Publication status	Published - 2021 May

All Science Journal Classification (ASJC) codes

Polymers and Plastics
Organic Chemistry
Materials Chemistry

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10.1002/marc.202000708

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title = "Periodic Assembly of Polyethylene Spherulites Re-Investigated by Breakthrough Interior Dissection",

abstract = "A completely novel 3D dissection approach is taken to re-investigate high-density polyethylene (HDPE) crystallized into periodic architectures in a wide range of Tc. This work first discovers that ring bands present in HDPE are crystallized in a quite wide Tc range (90–120 °C) all within regime-III growth. With further detailed analyses of the top-surface-relief patterns and 3D architectures of HDPE spherulites, this work has fully clarified the periodic morphology packed with alternate ways of single-crystal aggregates in correlation with the optical banding patterns. The proposed assembly mechanism sheds light that the periodic bands are actually composed of a cross-hatch grating structure in that the alternately perpendicular orientations from the ridge to valley bands being related to the interior radial to tangential lamellae. Such grating architectures in the interiors of HDPE can be viewed as a mimicry resembling shish-kebab lamellae self-aligned by Archimedean spiral-spins from the nucleus center.",

author = "Selvaraj Nagarajan and Woo, {Eamor M.}",

note = "Funding Information: This work has been financially supported by a one‐year research grant from Taiwan's Ministry of Science and Technology (MOST 108‐2221‐E‐006‐055), to which the authors express their gratitude. S.N. is grateful to MOST postdoc fellowship from Taiwan government. Private communications, collaboration, and idea exchanges with Prof. K. Tashiro (Emeritus Professor at Toyota Technological Institute, Nagoya, Japan) in recent years were helpful in shaping the direction of searching for novel aims of this work. Publisher Copyright: {\textcopyright} 2021 Wiley-VCH GmbH",

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Periodic Assembly of Polyethylene Spherulites Re-Investigated by Breakthrough Interior Dissection

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