Temperature dependence of surface segregation in miscible polymer blend of poly(4-trimethylsilylstyrene) /polyisoprene

Daisuke Kawaguchi, Masayuki Ohya, Naoya Torikai, Atsushi Takano, Yushu Matsushita

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Surface segregation behavior in miscible polymer blend thin film of poly(4-trimethylsilylstyrene)(PT)/polyisoprene (PI) was investigated as a function of temperatures on the basis of contact angle and neutron reflectivity measurements. For all temperatures employed, PT, which is a lower surface free energy component, is segregated at the surface of the blend film due to the requirement for minimizing the total free energy of the system. A concentration profile near the blend film surface is in good agreement with the mean-field prediction at 373 K and 393 K, being much lower than the lower critical solution temperature (LCST) for the blend in bulk. It was confirmed that decay length, ζ, and surface excess amount. z*. increase with increasing temperature. On the other hand, a concentration fluctuation in the internal region becomes remarkable at 453 K, even below the LCST in bulk. Thus, it is concluded that a concentration fluctuation in PT/PI blend thin film below the LCST is induced by the surface segregation of PT component in blend thin film.

Original languageEnglish
Pages (from-to)1274-1280
Number of pages7
JournalPolymer Journal
Volume39
Issue number12
DOIs
Publication statusPublished - Dec 1 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Materials Chemistry

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