Abstract
The cationic polymerization of isobutyl vinyl ether was conducted with a variety of triphenylmethyl salts as initiators, and the steric structure of the polymer was determined from the methylene dyad peaks in the13C-NMR spectra. The fraction of the isotactic dyad increased with the increase in the counteranion size from BF4-to CIO4− to BC14−, and then decreased: A trend similar to that observed for ɑ-methylstyrene. The correlation seems to be more complex for larger counteranions, and a periodical influence was clearly noticed. These results were explained by considering the tightness of the propagating ion-pair. Pentacoordinate counteranions showed peculiar influences in that the polymer structure was influenced by the counteranion concentration. The molecular weight distribution was unimodal, suggesting that a single propagating species is present.
| Original language | English |
|---|---|
| Pages (from-to) | 363-368 |
| Number of pages | 6 |
| Journal | Polymer Journal |
| Volume | 8 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Jan 1 1976 |
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All Science Journal Classification (ASJC) codes
- Polymers and Plastics
- Materials Chemistry
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The counterion effect on the steric course of the cationic polymerization of isobutyl vinyl ether. / Kunitake, Toyoki; Takarabe, Kunihide; Tsugawa, Shun Ichi.
In: Polymer Journal, Vol. 8, No. 4, 01.01.1976, p. 363-368.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The counterion effect on the steric course of the cationic polymerization of isobutyl vinyl ether
AU - Kunitake, Toyoki
AU - Takarabe, Kunihide
AU - Tsugawa, Shun Ichi
PY - 1976/1/1
Y1 - 1976/1/1
N2 - The cationic polymerization of isobutyl vinyl ether was conducted with a variety of triphenylmethyl salts as initiators, and the steric structure of the polymer was determined from the methylene dyad peaks in the13C-NMR spectra. The fraction of the isotactic dyad increased with the increase in the counteranion size from BF4-to CIO4− to BC14−, and then decreased: A trend similar to that observed for ɑ-methylstyrene. The correlation seems to be more complex for larger counteranions, and a periodical influence was clearly noticed. These results were explained by considering the tightness of the propagating ion-pair. Pentacoordinate counteranions showed peculiar influences in that the polymer structure was influenced by the counteranion concentration. The molecular weight distribution was unimodal, suggesting that a single propagating species is present.
AB - The cationic polymerization of isobutyl vinyl ether was conducted with a variety of triphenylmethyl salts as initiators, and the steric structure of the polymer was determined from the methylene dyad peaks in the13C-NMR spectra. The fraction of the isotactic dyad increased with the increase in the counteranion size from BF4-to CIO4− to BC14−, and then decreased: A trend similar to that observed for ɑ-methylstyrene. The correlation seems to be more complex for larger counteranions, and a periodical influence was clearly noticed. These results were explained by considering the tightness of the propagating ion-pair. Pentacoordinate counteranions showed peculiar influences in that the polymer structure was influenced by the counteranion concentration. The molecular weight distribution was unimodal, suggesting that a single propagating species is present.
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UR - http://www.scopus.com/inward/citedby.url?scp=0017193165&partnerID=8YFLogxK
U2 - 10.1295/polymj.8.363
DO - 10.1295/polymj.8.363
M3 - Article
AN - SCOPUS:0017193165
VL - 8
SP - 363
EP - 368
JO - Polymer Journal
JF - Polymer Journal
SN - 0032-3896
IS - 4
ER -