The counterion effect on the steric course of the cationic polymerization of isobutyl vinyl ether

Toyoki Kunitake; Kunihide Takarabe; Shun Ichi Tsugawa

doi:10.1295/polymj.8.363

The counterion effect on the steric course of the cationic polymerization of isobutyl vinyl ether

Toyoki Kunitake, Kunihide Takarabe, Shun Ichi Tsugawa

Institute for Advanced Study

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

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	https://doi.org/10.1295/polymj.8.363
Publication status	Published - Jul 1976

All Science Journal Classification (ASJC) codes

Polymers and Plastics
Materials Chemistry

Access to Document

10.1295/polymj.8.363

Fingerprint Dive into the research topics of 'The counterion effect on the steric course of the cationic polymerization of isobutyl vinyl ether'. Together they form a unique fingerprint.

Cite this

@article{75623f719f9c419fb07c820593008c25,

title = "The counterion effect on the steric course of the cationic polymerization of isobutyl vinyl ether",

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.",

author = "Toyoki Kunitake and Kunihide Takarabe and Tsugawa, {Shun Ichi}",

year = "1976",

month = jul,

doi = "10.1295/polymj.8.363",

language = "English",

volume = "8",

pages = "363--368",

journal = "Polymer Journal",

issn = "0032-3896",

publisher = "Nature Publishing Group",

number = "4",

}

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 - 1976/7

Y1 - 1976/7

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.

UR - http://www.scopus.com/inward/record.url?scp=0017193165&partnerID=8YFLogxK

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 -

The counterion effect on the steric course of the cationic polymerization of isobutyl vinyl ether

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Cite this