Synthesis of block copolymer segments containing different ratios of ethylene and 5-norbornen-2-yl acetate

Steve J. Diamanti, Vikram Khanna, Atsushi Hotta, Diane Yamakawa, Fumihiko Shimizu, Edward J. Kramer, Glenn H. Fredrickson, Guillermo C. Bazan

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59 Citations (Scopus)

Abstract

Block copolymerization of ethylene with 5-norbornen-2-yl acetate (1) by the nickel catalyst system [N-(2,6-diisopropylphenyl)-2-(2,6-diisopropylphenylimino)propanamide]Ni(η1-CH2Ph)(PMe3) (2) and Ni(COD)2 (bis(1,4-cyclooctadiene)nickel) (3) produces a variety of block copolymer structures that demonstrate microphase separation. Typical block copolymerizations were carried out in an autoclave charged with a solution of the catalyst mixture and 1 (0.15 M) in toluene. The autoclave was sealed and exposed to PC2H4 = 50 psi for a period of time (T1). A pressure jump to PC2H4 = 1100 psi was then applied and the reaction allowed to proceed for another predetermined interval (T2). Independent experiments were performed to isolate and examine the molecular weight and comonomer composition of the first block. Narrow molecular weight distributions and the increase of polymer molecular weight with increases in T1 or T2 are consistent with a product in which an initial block is formed at low ethylene pressures and quantitatively converted to a block copolymer by the jump to high pressure. Transmission electron microscopy confirms that the materials are microphase separated.

Original languageEnglish
Pages (from-to)10528-10529
Number of pages2
JournalJournal of the American Chemical Society
Volume126
Issue number34
DOIs
Publication statusPublished - 2004 Sep 1
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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    Diamanti, S. J., Khanna, V., Hotta, A., Yamakawa, D., Shimizu, F., Kramer, E. J., Fredrickson, G. H., & Bazan, G. C. (2004). Synthesis of block copolymer segments containing different ratios of ethylene and 5-norbornen-2-yl acetate. Journal of the American Chemical Society, 126(34), 10528-10529. https://doi.org/10.1021/ja047231g