Nucleation and growth of poly(ε-caprolactone) on poly(tetrafluoroethylene) by in-Situ AFM

L. G.M. Beekmans, R. Vallée, G. J. Vansco*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

31 Citations (Scopus)

Abstract

The nucleation behavior of poly(ε-caprolactone) (PCL) on friction-deposited poly(tetrafluoroethylene) (PTFE) was investigated by means of atomic force microscopy (AFM). This technique allows for imaging of the nucleation and crystallization processes in real time. An estimation of the PCL crystal orientation on the PTFE substrate is made by evaluating the growth rates and the growth geometry of the lamellar crystals formed on PTFE. On the basis of the data collected, it is proposed that PCL crystallizes on PTFE predominantly via a (100)PCL contact plane (∼80%). The crystals adopt an orientation that minimizes the lattice mismatch at the interface between the nucleating PTFE and PCL. A (010)PCL||(100)PTFE contact plane was simultaneously observed at a lower occurrence of approximately 20%. Visualization of the PTFE fibrillar morphology at higher resolution during isothermal crystallization revealed the appearance of a third PCL crystal orientation which developed later in time. The corresponding crystals were observed to develop from grooves on the PTFE substrate, indicating a graphoepitaxial nucleation mechanism.

Original languageEnglish
Pages (from-to)9383-9390
Number of pages8
JournalMacromolecules
Volume35
Issue number25
DOIs
Publication statusPublished - 3 Dec 2002

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