Dynamics and morphology in nanostructured thermoset network/block copolymer blends during network formation

Jovan Mijovic, Mingzhao Shen, Jo Wing Sy, Iñaki Mondragon

Research output: Contribution to journalArticle

Abstract

Molecular dynamics and morphology in the blends of a network-forming reactive polymer and an amphiphilic block copolymer were examined as a function of the advancement of chemical reactions. In the blends containing a triblock copolymer, both microscopic (domains of the order of micrometers) and nanoscopic (domains of the order of nanometers) phase separations were observed during network formation. Interestingly, only nanoscopic phase separation was found in the blends containing a diblock copolymer. The shape and the origin of these nanoscopic features were investigated by atomic force microscopy and were found to be a function of blend composition. A concept was advanced of the three-phase nanostructured morphology that begins to form with self-assembly of one block and continues to develop during network formation in the postassembly stage. The changes in relaxation dynamics that accompany network formation were monitored by broad-band dielectric relaxation spectroscopy (DRS) and were shown to represent a signature of the morphological state of the blend. The ability of DRS to identify and deconvolute various relaxation processes during network formation and phase separation is noteworthy and should be exploited as means of monitoring and controlling the development of nanostructured morphology in these complex systems.

Original languageEnglish (US)
Pages (from-to)5235-5244
Number of pages10
JournalMacromolecules
Volume33
Issue number14
DOIs
StatePublished - Jul 11 2000

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Thermosets
Phase separation
Block copolymers
Dielectric relaxation
Spectroscopy
Functional polymers
Relaxation processes
Self assembly
Molecular dynamics
Large scale systems
Chemical reactions
Atomic force microscopy
Monitoring
Chemical analysis

ASJC Scopus subject areas

  • Materials Chemistry

Cite this

Dynamics and morphology in nanostructured thermoset network/block copolymer blends during network formation. / Mijovic, Jovan; Shen, Mingzhao; Sy, Jo Wing; Mondragon, Iñaki.

In: Macromolecules, Vol. 33, No. 14, 11.07.2000, p. 5235-5244.

Research output: Contribution to journalArticle

Mijovic, Jovan ; Shen, Mingzhao ; Sy, Jo Wing ; Mondragon, Iñaki. / Dynamics and morphology in nanostructured thermoset network/block copolymer blends during network formation. In: Macromolecules. 2000 ; Vol. 33, No. 14. pp. 5235-5244.
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