Phase behavior of polystyrene-block-poly(4-vinylpyridine) copolymers coordinated by metal chloride

Dong Hyun Lee, Sung Hyun Han, Wonchul Joo, Jin Kon Kim, June Huh

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

The effect of cadmium chloride (CdCl2) on the phase behavior of polystyrene-block-poly(4-vinylpyridine) copolymer (S4VP) was investigated by using rheometry, small-angle X-ray scattering, and transmission electron microscopy. For this purpose, symmetric S4VPs with various molecular weights were prepared by anionic polymerization. We found that with the addition of CdCl2 the order-to-disorder transition of S4VP was significantly increased because of the intermolecular coordination connecting different P4VP block chains. We also studied the change of the domain spacing (D) upon addition of CdCl2 as well as gelation behavior. At a relatively low content of CdCl2 (γ < 6, where γ is the number of coordinated CdCl2 per chain), D remains unchanged. However, when the amount of CdCl2 increases further, D begins to decrease due to many coordinations of CdCl2 that strongly perturb block copolymer conformation, including many ring closures. Furthermore, it is found that the scaled gelation point increases with increasing molecular weights of S4VP.

Original languageEnglish
Pages (from-to)2577-2583
Number of pages7
JournalMacromolecules
Volume41
Issue number7
DOIs
Publication statusPublished - 2008 Apr 8
Externally publishedYes

ASJC Scopus subject areas

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

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