2,4.

Toyoki Kunitake, Takeharu Ochiai, Osamu Ohara

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

In the reported program, spiro left bracket 2,4 right bracket hepta-4. 6-diene, a derivative of cyclopentadiene, was polymerized at minus 76 degree C with various triphenylmethyl salts as initiator. The polymer consists only of the 1,2- and 1,4-addition structures, and their contents can be determined by the relative area of the olefin proton peaks. The polymer structure changed characteristically with the polymerization conditions. The content of 1,4-structure decreased with increasing polarity of the medium from 45-70 in toluene to 25-30% in 7:3 CH//2Cl//2-CH//3CN. In 1:1 CH//2Cl//2-toluene, the 1,4-structure content decreased tom 70% to 40% with increasing radii of counteranions. These results were interpreted according to the model of the cationic propagation proposed earlier, as arising from the different tightness of the propagating ion pair.

Original languageEnglish
Pages (from-to)2581-2590
Number of pages10
JournalJ Polym Sci Polym Chem Ed
Volume13
Issue number11
Publication statusPublished - Jan 1 1975
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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