Linear dynamics of end-functionalized polymer melts: linear chains, stars, and blends

Dimitris Vlassopoulos, Marinos Pitsikalis, Nikos Hadjichristidis

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

We investigated the linear viscoelastic response of model mono-, di-, and tri-ω-functionalized three-arm star polybutadiene melts with zwitterionic end groups using dynamic rheological measurements. Depending on the degree of functionalization, these polymers self-assembled into distinct supramolecular structures resembling nonspherical starlike objects, transient networks consisting of highly branched structures, and collapsed soft-sphere conformations, with aggregation numbers affected by the arm molecular weight. The dependence of the relaxation times on the latter indicated activated processes analogous to multiarm star polymers. On the other hand, the dynamics of ω-functionalized linear chains, forming clusters with tubular or bcc structures, was characterized by a much smaller energetic barrier. The use of different sample preparation protocols as well as binary blends involving stars demonstrated the stability of the self-organized structures and confirmed the assignment of the relaxation processes.

Original languageEnglish (US)
Pages (from-to)9740-9746
Number of pages7
JournalMacromolecules
Volume33
Issue number26
DOIs
StatePublished - Dec 26 2000
Externally publishedYes

ASJC Scopus subject areas

  • Materials Chemistry

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