Self-assembly of an ultra-high-molecular-weight comb block copolymer at the air-water interface

Lei Zhao, Matthew D. Goodman, Ned B. Bowden, Zhiqun Lin

Research output: Contribution to journalArticlepeer-review

Abstract

The self-assembly of a newly synthesized, amphiphilic comb block copolymer (CBCP) at the air-water interface was systematically explored using the Langmuir-Blodgett (LB) technique. The CBCP had an ultra-high molecular weight (Mw = 510 × 103 g mol-1) with polystyrene arms grafted along one block of long hydrophilic backbone. At the air-water interface, the CBCP molecules spontaneously assembled into ribbon-like structures and cellular patterns at zero surface pressure when a volatile solvent (i.e., chloroform) and a less volatile solvent (i.e., toluene) were used, respectively. This spontaneous self-assembly behavior of the CBCP was induced by the dewetting process. The mechanism for the morphological change as a function of surface pressure was scrutinized and further confirmed by compression-expansion cycle and solvent vapor annealing studies. To the best of our knowledge, this is the first study of self-assembly of ultra-high-molecular- weight, amphiphilic CBCPs at the air-water interface. As such, it provides insight into the design of controllable pattern formation using amphiphilic copolymers.

Original languageEnglish (US)
Pages (from-to)4698-4703
Number of pages6
JournalSoft Matter
Volume5
Issue number23
DOIs
StatePublished - Nov 30 2009
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics

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