Surface and interfacial segregation in blends of polystyrene with functional end groups and deuterated polystyrene

Daisuke Kawaguchi, Keiji Tanaka, Naoya Torikai, Atsushi Takahara, Tisato Kajiyama

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The effect of chain-end chemistry on surface and interfacial segregation in symmetric blends of polystyrene (hPS)/ deuterated polystyrene (dPS) has been investigated by X-ray photoelectron and secondary ion mass spectroscopy in conjunction with neutron reflectivity measurements. α,ω-Fluoroalkyl- and α,ω-carboxy-terminated polystyrenes (α,ω-hPS(R f)2 and α,ω-hPS(COOH)2) were used as end-functionalized polymers; the former possesses chain ends with lower surface energies, and the latter possesses higher surface energies compared with that of the main chain. In the case of an α,ω-hPS(R f)2/dPS blend film, α,ω-hPS(R f)2 was enriched at the surface owing to the surface localization of the Rf groups, although the surface energy of the hPS segments was slightly higher than that of the dPS ones. On the contrary, in the case of an α,ω-hPS(COOH)2/dPS blend film, dPS was preferentially segregated at the surface. This may be due to a surface depletion of COOH ends and an apparent molecular weight increase of α,ω- hPS(COOH)2 produced by a hydrogen-bonded intermolecular association of COOH ends in addition to the surface energy difference between hPS and dPS segments. Interestingly, both Rf and COOH chain ends were partitioned to the substrate interface for the α,ω-hPS(Rf) 2/dPS and α,ω-hPS(COOH)2/dPS blend films, resulting in the segregation of the hPS component at the substrate interface for both blends. The results presented imply that surface and interfacial segregation in polymer blends could be regulated by incorporating functional groups into the end portions of one component.

Original languageEnglish
Pages (from-to)7269-7275
Number of pages7
JournalLangmuir
Volume23
Issue number13
DOIs
Publication statusPublished - Jun 19 2007

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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