Molecular recognition in structured matrixes: Control of guest localization in block copolymer films

Roy Shenhar, Hao Xu, Benjamin L. Frankamp, Thomas E. Mates, Amitav Sanyal, Oktay Uzun, Vincent M. Rotello*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

We demonstrate the use of molecular recognition to control the spatial distribution of guest molecules within block copolymer films. Block copolymers bearing recognition units were combined with complementary and noncomplementary molecules, and the extent of segregation of these molecules into the different domain types within microphase-separated thin films was quantitatively analyzed using dynamic secondary ion mass spectrometry (SIMS). Complementarity between the guest molecules and the polymer functionalities proved to be a key factor and an efficient tool for directing the segregation preference of the molecules to the different domain types. The effect of segregation preference on the glass transition temperature was studied using differential scanning calorimetry (DSC), and the results corroborate the SIMS findings. In a complementary study, guests with tunable sizes (via dendron substituents) were used to control block copolymer morphology. Morphological characterization using transmission electron microscopy (TEM) and X-ray diffraction reveal that selectivity differences can be directly translated into the ability to obtain different morphologies from recognition unit-functionalized block copolymer scaffolds.

Original languageAmerican English
Pages (from-to)16318-16324
Number of pages7
JournalJournal of the American Chemical Society
Volume127
Issue number46
DOIs
StatePublished - 23 Nov 2005

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