Supramolecular triblock copolymers containing complementary nucleobase molecular recognition

Brian D. Mather, Margaux B. Baker, Frederick L. Beyer, Michael A G Berg, Matthew Green, Timothy E. Long

Research output: Contribution to journalArticle

94 Citations (Scopus)

Abstract

A novel difunctional alkoxyamine initiator, DEPN2, was synthesized and utilized as an efficient initiator in nitroxide-mediated controlled radical polymerization of triblock copolymers. Complementary hydrogen-bonding triblock copolymers containing adenine (A) and thymine (T) nucleobase-functionalized outer blocks were synthesized. These thermoplastic elastomeric block copolymers contained short nucleobase-functionalized outer blocks (Mn ∼ 1K-4K) and n-butyl acrylate rubber blocks of variable length (Mn ∼ 14K-70K). Hydrogen-bonding interactions were observed for blends of the complementary nucleobase-functionalized block copolymers in terms of increased specific viscosity as well as higher scaling exponents for specific viscosity as a function of solution concentration. In the solid state, the blends exhibited evidence of a complementary A-T hard phase, which formed upon annealing, and dynamic mechanical analysis (DMA) revealed higher softening temperatures. Morphological development of the block copolymers was studied using SAXS and AFM, which revealed intermediate interdomain spacings and surface textures for the blends compared to the individual precursors. Hydrogen-bonding interactions enabled the compatibilization of complementary hydrogen-bonding guest molecules such as 9-octyladenine.

Original languageEnglish (US)
Pages (from-to)6834-6845
Number of pages12
JournalMacromolecules
Volume40
Issue number19
DOIs
StatePublished - Sep 18 2007
Externally publishedYes

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Molecular recognition
Block copolymers
Hydrogen bonds
Viscosity
Thymine
Compatibilizers
Rubber
Adenine
Dynamic mechanical analysis
Free radical polymerization
Thermoplastics
Textures
Annealing
Molecules

ASJC Scopus subject areas

  • Materials Chemistry

Cite this

Mather, B. D., Baker, M. B., Beyer, F. L., Berg, M. A. G., Green, M., & Long, T. E. (2007). Supramolecular triblock copolymers containing complementary nucleobase molecular recognition. Macromolecules, 40(19), 6834-6845. https://doi.org/10.1021/ma070865y

Supramolecular triblock copolymers containing complementary nucleobase molecular recognition. / Mather, Brian D.; Baker, Margaux B.; Beyer, Frederick L.; Berg, Michael A G; Green, Matthew; Long, Timothy E.

In: Macromolecules, Vol. 40, No. 19, 18.09.2007, p. 6834-6845.

Research output: Contribution to journalArticle

Mather, Brian D. ; Baker, Margaux B. ; Beyer, Frederick L. ; Berg, Michael A G ; Green, Matthew ; Long, Timothy E. / Supramolecular triblock copolymers containing complementary nucleobase molecular recognition. In: Macromolecules. 2007 ; Vol. 40, No. 19. pp. 6834-6845.
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