Architecturally-induced tricontinuous cubic morphology in compositionally symmetric miktoarm starblock copolymers

Yiannis Tselikas, Nikolaos Hadjichristidis*, Robert L. Lescanec, Christian C. Honeker, Meinhard Wohlgemuth, Edwin L. Thomas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

77 Scopus citations

Abstract

We report the synthesis and morphological characterization of a miktoarm block copolymer architecture: (PSαM-PIM)n-(PSM-PI αM)n, where M ∼ 20 000, n = 1, 2, and the arm asymmetry parameter α = 1, 2, or 4 (α is the ratio of the outer block molecular weight to that of the inner block). These block copolymers are symmetric in overall composition and exhibit n- and α-dependent microdomain morphologies. Alternating lamellae are observed for linear tetrablocks (n = 1), α = 1, 2, 4, and for inverse starblock (n = 2), α = 1, 2. An architecturally-induced morphological transition from lamellae to a tricontinuous cubic structure is observed with n = 2 and α = 4. The formation of the tricontinuous cubic microdomain structure in this compositionally symmetric system is thought to relieve the overcrowding of the four peripheral PS-PI junctions by providing a curved intermaterial dividing surface with a triply periodic microdomain structure, allowing some bridging by the interior blocks of the miktoarm star.

Original languageEnglish (US)
Pages (from-to)3390-3396
Number of pages7
JournalMacromolecules
Volume29
Issue number10
DOIs
StatePublished - May 6 1996

ASJC Scopus subject areas

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

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