Crystallization of block copolymers in restricted cylindrical geometries

Cvetelin Vasilev*, Günter Reiter, Stergios Pispas, Nikos Hadjichristidis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

Using Tapping Mode atomic force microscopy, we studied crystallization of polymers in confined cylindrical geometries of micro-phase separated asymmetric diblock copolymers, deposited in thin films onto solid substrates. We observed that in most cases crystallization occurs separately and independently in each cylinder of the mesophase pattern. We followed the kinetics of the crystallization process with time and found an influence of the lateral size of the cylindrical morphology on the rate of crystallization. The present data are compared to previous results on spherical mesophase patterns. The growth rate within one single cylinder was found to be not necessarily constant. Depending on the amount of crystallized material and the molecular weight, structural relaxations of the crystals can have very strong influence on the amorphous matrix and can even lead to the destruction of the mesophase pattern, allowing for break-out crystallization. As a consequence of break-out crystallization, crystallization kinetics changed considerably since the crystal growth was not limited anymore to the confinement imposed by the cylinders.

Original languageEnglish (US)
Pages (from-to)330-340
Number of pages11
JournalPolymer
Volume47
Issue number1
DOIs
StatePublished - Jan 3 2006
Externally publishedYes

Keywords

  • Atomic force microscopy
  • Block copolymers
  • Confined crystallization

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

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