Periodic extinction bands composed of all flat-on lamellae in poly(dodecamethylene terephthalate) thin films crystallized at high temperatures

Graecia Lugito, Eamor M. Woo, Shih Min Chang

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Using in-house synthesized poly(dodecamethylene terephthalate) (P12T) as a model, periodic extinction-banded spherulites melt-crystallized at high Tcs (100–115 °C) are expounded in terms of growth mechanism. The extinction-banded spherulites wildly differing from the usual blue/orange double ring-banded spherulites are composed of all flat-on discrete single-crystalline lamellae packed like roof shingles (or fish scales) along the circularly curved bands and the lamellae in the extinction bands are flat with a lozenge shape with no continuous twisting at all. For P12T films of more than 10 µm crystallized at Tc = 105–115 °C, no periodic bands were seen, and all spherulites were ringless, where periodic growth precipitation of crystals to extinction does not occur until impingement. Extinction bands in the P12T spherulites with the inter-ring spacing steadily decrease with decreasing film thickness, because for thinner films (submicrons to 2 µm), draining or depletion of available molten species takes place more frequently, leading to bands of smaller inter-ring spacing. The petal-like extinction bands are discussed and analyzed in detail using 3D AFM imaging.

Original languageEnglish
Pages (from-to)601-611
Number of pages11
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume55
Issue number7
DOIs
Publication statusPublished - 2017 Apr 1

Fingerprint

terephthalate
lamella
spherulites
Crystallization
Roofs
Fish
Film thickness
Molten materials
extinction
Crystalline materials
Imaging techniques
Thin films
thin films
Temperature
Crystals
rings
spacing
petals
impingement
roofs

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Cite this

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title = "Periodic extinction bands composed of all flat-on lamellae in poly(dodecamethylene terephthalate) thin films crystallized at high temperatures",
abstract = "Using in-house synthesized poly(dodecamethylene terephthalate) (P12T) as a model, periodic extinction-banded spherulites melt-crystallized at high Tcs (100–115 °C) are expounded in terms of growth mechanism. The extinction-banded spherulites wildly differing from the usual blue/orange double ring-banded spherulites are composed of all flat-on discrete single-crystalline lamellae packed like roof shingles (or fish scales) along the circularly curved bands and the lamellae in the extinction bands are flat with a lozenge shape with no continuous twisting at all. For P12T films of more than 10 µm crystallized at Tc = 105–115 °C, no periodic bands were seen, and all spherulites were ringless, where periodic growth precipitation of crystals to extinction does not occur until impingement. Extinction bands in the P12T spherulites with the inter-ring spacing steadily decrease with decreasing film thickness, because for thinner films (submicrons to 2 µm), draining or depletion of available molten species takes place more frequently, leading to bands of smaller inter-ring spacing. The petal-like extinction bands are discussed and analyzed in detail using 3D AFM imaging.",
author = "Graecia Lugito and Woo, {Eamor M.} and Chang, {Shih Min}",
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AB - Using in-house synthesized poly(dodecamethylene terephthalate) (P12T) as a model, periodic extinction-banded spherulites melt-crystallized at high Tcs (100–115 °C) are expounded in terms of growth mechanism. The extinction-banded spherulites wildly differing from the usual blue/orange double ring-banded spherulites are composed of all flat-on discrete single-crystalline lamellae packed like roof shingles (or fish scales) along the circularly curved bands and the lamellae in the extinction bands are flat with a lozenge shape with no continuous twisting at all. For P12T films of more than 10 µm crystallized at Tc = 105–115 °C, no periodic bands were seen, and all spherulites were ringless, where periodic growth precipitation of crystals to extinction does not occur until impingement. Extinction bands in the P12T spherulites with the inter-ring spacing steadily decrease with decreasing film thickness, because for thinner films (submicrons to 2 µm), draining or depletion of available molten species takes place more frequently, leading to bands of smaller inter-ring spacing. The petal-like extinction bands are discussed and analyzed in detail using 3D AFM imaging.

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