Sluggish growth of poly(ε-caprolactone) leads to petal-shaped aggregates packed with thick-stack lamellar bundles

Selvaraj Nagarajan, Eamor M. Woo

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Kinetically sluggish growth of poly(ε-caprolactone) at highTc= 50 °C leads to a peculiar banding morphology, where thick-stacked lamellae self-assemble into camellia-petal-like bands with their outer rims divided into aca.10 lobs of round-shaped petals. The sluggish growth atTc= 50 °C thick films is inductive and the thickened lamellae self-assemble into aggregates of peculiar and novel camellia-petal-shaped ring bands. Using novel morphology analysesvia3D-dissection approaches, the lamellae underneath the ridge bands are shown to be all perpendicular to the substrate plane,i.e.normally-oriented with respect to the substrate surface; whereas, the interior lamellae underneath the valley band are all flat-on and horizontal to the substrate plane. Stereo-depiction clearly demonstrates that the interior lamellae are periodically grating architectures with a fixed crossbar pitch of 20-30 μm of the interior lamellar assembly, matching with the optical inter-ring spacing of optical bands. The mechanisms of growth and assembly are probed in detail.

Original languageEnglish
Pages (from-to)5321-5330
Number of pages10
JournalCrystEngComm
Volume23
Issue number31
DOIs
Publication statusPublished - 2021 Aug 21

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics

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