Sensitivity of Polymer Crystallization to Shear at Low and High Supercooling of the Melt

Alicyn Marie Rhoades, Anne M. Gohn, Jiho Seo, René Androsch, Ralph H. Colby

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Flow-induced crystallization (FIC) is a dominant mechanism of polymer self-assembly, but the process is poorly understood at high supercooling and under fast cooling conditions because of structural rearrangements that occur during slow heating and cooling conditions typically used for investigation. Incorporating fast-scanning chip calorimetry techniques, the influence that specific amounts of shear flow have on the subsequent crystallization of polyamide 66 over a wide range of temperatures, 85-240 °C, is determined. At high temperatures, heterogeneous nucleation dominates and crystallization rate increases with increasing shear. Low-temperature crystallization, driven by homogeneous nucleation, is not influenced by previous shear flow, but sheared samples are able to crystallize via the heterogeneous nucleation route at temperatures 15 K lower than unsheared materials. The magnitude of previous shear flow also dictates α-/γ-crystalline phase development and crystallization during cooling at rates below 200 K/s. This approach provides a route to develop important thermodynamic and kinetic insights that describe the crystallization behavior of many important polymers to enable the advanced engineering of polymer processing and injection molding applications, where practical cooling rates typically range between 10 K/s and 1000 K/s.

Original languageEnglish (US)
Pages (from-to)2785-2795
Number of pages11
JournalMacromolecules
Volume51
Issue number8
DOIs
StatePublished - Apr 24 2018

Fingerprint

Supercooling
Crystallization
Polymers
Shear flow
Cooling
Nucleation
Temperature
Nylons
Calorimetry
Polyamides
Injection molding
Self assembly
Thermodynamics
Crystalline materials
Scanning
Heating
Kinetics
Processing

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Rhoades, Alicyn Marie ; Gohn, Anne M. ; Seo, Jiho ; Androsch, René ; Colby, Ralph H. / Sensitivity of Polymer Crystallization to Shear at Low and High Supercooling of the Melt. In: Macromolecules. 2018 ; Vol. 51, No. 8. pp. 2785-2795.
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Sensitivity of Polymer Crystallization to Shear at Low and High Supercooling of the Melt. / Rhoades, Alicyn Marie; Gohn, Anne M.; Seo, Jiho; Androsch, René; Colby, Ralph H.

In: Macromolecules, Vol. 51, No. 8, 24.04.2018, p. 2785-2795.

Research output: Contribution to journalArticle

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AU - Gohn, Anne M.

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