Tapered block copolymers containing ethylene and a functionalized comonomer

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

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)


We report the synthesis of tapered block copolymers of ethylene with 5-norbomen-2-yl acetate (1) by the nickel catalyst system [N-(2,6- diisopropylphenyl)-2-(2,6-diisopropylphenylimino)propanamide] Ni-η 1-CH 2Ph)(PMe 3) (2) and Ni(COD) 2 (bis(1,4-cyclooctadiene)nickel). This technique utilizes a one-pot semibatch copolymerization in which ethylene is continuously added while 1 is depleted by incorporation into the polymer chain. The simplicity of this technique allows the construction of a polymer library, which enabled us to study the effect of polymer composition and chain length on solid-state morphology and mechanical and thermal properties. From these studies we were able to derive a profile relating the probability of 1 insertion vs degree of polymerization (X n). Under proper experimental conditions, these tapered polymers form ordered microphase-separated morphologies where the phase morphology is modulated by the polymer chain length. The percent crystallinity and storage modulus of the polymers were found to be chain length dependent.

Original languageEnglish
Pages (from-to)3270-3274
Number of pages5
Issue number9
Publication statusPublished - 2006 May 2
Externally publishedYes

ASJC Scopus subject areas

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


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