Crystallization and physical ageing of poly (2-vinylpyridine)-b- poly(ethylene oxide) diblock copolymers

Miguel Córdova, Arnaldo T. Lorenzo, Alejandro J. Müller, Panagiota Fragouli, Hermis Iatrou, Nikolaos Hadjichristidis

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Summary: A set of melt miscible Poly(2-vinyl pyridine)-b-Poly(ethylene oxide) (P2VPb-PEO) block copolymers of different compositions were studied. Transmission electron microscopy shows phase separation in the materials during the crystallization process of the PEO block as crystalline lamellae are observed for all compositions evaluated. The isothermal crystallization kinetics of PEO is progressively retarded as the P2VP content in the copolymer increases, since P2VP hinders molecular mobility in the miscible amorphous phase. Polarized light optical microscopy demonstrated that the glassy P2VP block has a negative effect on the secondary nucleation of the PEO. Finally, physical ageing experiments performed in the glassy state of the amorphous mixed phase, at different ageing times, demonstrated that a nucleating effect can be induced in the glassy state as a consequence of the reorganization of the amorphous regions. This nucleating effect significantly alters the cold crystallization rate upon subsequent heating above the glass transition temperature.

Original languageEnglish (US)
Pages (from-to)101-106
Number of pages6
JournalMacromolecular Symposia
Volume287
Issue number1
DOIs
StatePublished - Jan 1 2010

Keywords

  • Block copolymers
  • Crystallization
  • Morphology
  • Physical ageing
  • Poly(ethyleneoxide)

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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