Synthesis of polyethylene and polypropylene containing fluorene units in the side chain

Naofumi Naga, Hiroki Sakai, Chiharu Usui, Haruhiko Tomoda

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Copolymerizations of ethylene or propylene and allyl monomers containing 9-fluorenyl group, diallyl-di-9-fluorenylsilane (DAFS), 9,9-diallylfluorene (DAF), and 9-allylfluorene (AF), were investigated with various zirconocene catalysts using methylaluminoxane as a cocatalyst. The bridged zirconocene catalysts, especially a syndioselective catalyst, showed a higher reactivity for all the comonomers than the nonbridged catalysts. DAFS was mainly incorporated into the polymer chain via cyclization insertion, whereas DAF was copolymerized via both 1,2-and cyclization insertions. Cyclization selectivity, ratio of cyclized insertion unit, of DAF in the copolymerization with propylene was higher than that in the copolymerization with ethylene. Copolymerization with AF yielded low-molecular weight copolymer because of frequent chain transfer reaction. Optical properties of the propylene based-copolymers were investigated by UV-vis and photoluminescence spectroscopy, and absorption-and emission-derived from fluorenyl groups were detected in the copolymers.

Original languageEnglish
Pages (from-to)3542-3552
Number of pages11
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume48
Issue number16
DOIs
Publication statusPublished - 2010 Aug 15

Keywords

  • Allyl monomer
  • Copolymerization
  • Ethylene
  • Fluorene
  • Optical property
  • Polyethylene
  • Polypropylene
  • Propylene
  • Ziegler-Natta polymerization
  • Zirconocene

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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