On the role of catalyst components in the living metathesis polymerization of substituted acetylenes by MoOCl4-based systems

Shigetaka Hayano, Toshio Masuda, Hoyning Ji, Rigoberto C. Advincula

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The role of components in MoOCl4-based living polymerization catalysts was studied. The MALDI TOF MS spectra of the poly(o-[(trifluoromethyl)phenyl]acetylene)s prepared with n-Bu4Sn and Et3A1 as cocatalysts suggested a difference of 28(C2H4) in polymer molecular weight. This indicates that the formed polymer possesses an alkyl group of cocatalyst in the initiating chain end, which implies the transalkylation between MoOCl4 and a cocatalyst and the subsequent formation of a Mo carbene. Sterically uncrowded aliphatic alcohols were useful as the third catalyst components. Addition of EtOH to the catalyst system led to the increase of activation enthalpy and the change of activation entropy from a negative to positive value in the propagation reaction, which suggests that EtOH coordinates to the propagating end competitively with the monomer.

Original languageEnglish
Pages (from-to)129-136
Number of pages8
JournalPolymer Bulletin
Volume44
Issue number2
DOIs
Publication statusPublished - 2000
Externally publishedYes

Fingerprint

Living polymerization
Alkynes
metathesis
Acetylene
acetylene
polymerization
catalysts
Catalysts
Polymers
Chemical activation
activation
polymers
carbenes
Enthalpy
molecular weight
alcohols
Alcohols
Entropy
monomers
Monomers

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Polymers and Plastics
  • Materials Chemistry

Cite this

On the role of catalyst components in the living metathesis polymerization of substituted acetylenes by MoOCl4-based systems. / Hayano, Shigetaka; Masuda, Toshio; Ji, Hoyning; Advincula, Rigoberto C.

In: Polymer Bulletin, Vol. 44, No. 2, 2000, p. 129-136.

Research output: Contribution to journalArticle

Hayano, Shigetaka ; Masuda, Toshio ; Ji, Hoyning ; Advincula, Rigoberto C. / On the role of catalyst components in the living metathesis polymerization of substituted acetylenes by MoOCl4-based systems. In: Polymer Bulletin. 2000 ; Vol. 44, No. 2. pp. 129-136.
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