Enhanced Segregation of a Diblock Copolymer Caused by Hydrogen Bonding

Kevin H. Dai, Edward J. Kramer, Jean M.J. Fréchet, Paul G. Wilson, Robert S. Moore, Timothy Edward Long

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Abstract

Utilizing forward recoil spectrometry (FRES), we have determined the segregation isotherm which describes the interfacial excess zi* of diblock copolymers of poly(d8-styrene-b-2-vinylpyridine) [dPSPVP] at the interface between the PS/PVP, PS/poly(4-vinyl phenol) [PS/PVPh], and PS/poly(4-vinylbenzoic acid) [PS/PVBA] as a function of ϕ, the volume fraction of diblock copolymer remaining in the host PS phase after annealing the specimens to reach the equilibrium segregation. A remarkable increase in the saturation Zi* is observed at the PS/PVBA and the PS/PVPh interfaces as compared to that at the corresponding PS/PVP interface. This enhanced segregation is caused by an attraction due to the formation of hydrogen bonds of the PVP block with PVBA and PVPh homopolymers. The segment density profile of copolymer at the PS/PVBA interface determined by neutron reflectometry indicates that the interface is almost totally occupied by the copolymer and the copolymer chains at the interface are highly stretched. This result suggests that the interface is close to the “brush” structure as pictured by Leibler.

Original languageEnglish
Pages (from-to)5187-5191
Number of pages5
JournalMacromolecules
Volume27
Issue number18
DOIs
Publication statusPublished - 1994 Aug 1
Externally publishedYes

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ASJC Scopus subject areas

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

Cite this

Dai, K. H., Kramer, E. J., Fréchet, J. M. J., Wilson, P. G., Moore, R. S., & Long, T. E. (1994). Enhanced Segregation of a Diblock Copolymer Caused by Hydrogen Bonding. Macromolecules, 27(18), 5187-5191. https://doi.org/10.1021/ma00096a049