Microphase separation of cyclic block copolymers of styrene and butadiene and of their corresponding linear triblock copolymers

Yuqing Zhu, Samuel P. Gido*, Hermis Iatrou, Nikolaos Hadjichristidis, Jimmy W. Mays

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

57 Scopus citations

Abstract

A series of five cyclic block copolymers of styrene and butadiene, having essentially the same molecular weight (52 ± 5 kg/mol) and PS volume fraction varying from 11 to 70%, were synthesized by cyclization of α,ω-dilithium polystyrene-polybutadiene-polystyrene triblock copolymers with bis-(dimethylchlorosilyl)ethane. The cyclic block copolymers thus obtained have practically the same molecular weight and composition as their corresponding linear triblock copolymers. All materials were investigated via transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS) techniques. In three cases where the cyclic and the corresponding linear block copolymer had the same morphology, the domain spacings of the cyclic block copolymers are found to be 84%-89% of those of their respective linear triblock copolymers. In the other two cases different morphologies are found in the cyclic and its corresponding triblock copolymer. Compared to their linear triblocks, the interfaces are curved away from the connected end blocks.

Original languageEnglish (US)
Pages (from-to)148-152
Number of pages5
JournalMacromolecules
Volume36
Issue number1
DOIs
StatePublished - Jan 14 2003

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Microphase separation of cyclic block copolymers of styrene and butadiene and of their corresponding linear triblock copolymers'. Together they form a unique fingerprint.

Cite this