SPECTROSCOPIC OBSERVATION OF THE PROPAGATING SPECIES IN THE CATIONIC POLYMERIZATION OF VINYL MONOMERS.

Toyoki Kunitake, Kunihide Takarabe

Research output: Contribution to conferencePaper

6 Citations (Scopus)

Abstract

In the reported experiments, the reaction of several vinyl aromatic monomers with CF//3SO//3H and H//2SO//4 was carried out in dichloroethane at 30 degree C. The rapid formation of the cationic species was followed by the stopped-flow method, and the transient species were identified by rapid-scan spectra and rapid quenching of the reaction mixture. The monomeric cation was formed predominantly in the reaction of 1,1-diphenylethylene and excess CF//3SO//3H; however, an indanic dimer was formed in the presence of excess diphenylethylene. The rate constant for the formation of the cationic species was (3 similar 4) multiplied by 10**3M** minus **1. sec** minus **1. On the other hand, the reaction of diphenylethylene and H//2SO//4 produced two short-lived species: the monomeric cation and, probably, a monomeric radical cation. The transient species (lifetime similar 50 msec) were similarly observed in the reaction of CF//3SO//3H with styrene, methylstyrenes, and indene. General discussion is included in the paper.

Original languageEnglish
Pages33-38
Number of pages6
Publication statusPublished - Jan 1 1977
Externally publishedYes
EventInt Symp on Cationic Polym, 4th - Akron, OH, USA
Duration: Jun 20 1976Jun 24 1976

Other

OtherInt Symp on Cationic Polym, 4th
CityAkron, OH, USA
Period6/20/766/24/76

Fingerprint

Cationic polymerization
Monomers
Positive ions
Rapid quenching
Dimers
Styrene
Rate constants
Experiments

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Kunitake, T., & Takarabe, K. (1977). SPECTROSCOPIC OBSERVATION OF THE PROPAGATING SPECIES IN THE CATIONIC POLYMERIZATION OF VINYL MONOMERS.. 33-38. Paper presented at Int Symp on Cationic Polym, 4th, Akron, OH, USA, .

SPECTROSCOPIC OBSERVATION OF THE PROPAGATING SPECIES IN THE CATIONIC POLYMERIZATION OF VINYL MONOMERS. / Kunitake, Toyoki; Takarabe, Kunihide.

1977. 33-38 Paper presented at Int Symp on Cationic Polym, 4th, Akron, OH, USA, .

Research output: Contribution to conferencePaper

Kunitake, T & Takarabe, K 1977, 'SPECTROSCOPIC OBSERVATION OF THE PROPAGATING SPECIES IN THE CATIONIC POLYMERIZATION OF VINYL MONOMERS.', Paper presented at Int Symp on Cationic Polym, 4th, Akron, OH, USA, 6/20/76 - 6/24/76 pp. 33-38.
Kunitake T, Takarabe K. SPECTROSCOPIC OBSERVATION OF THE PROPAGATING SPECIES IN THE CATIONIC POLYMERIZATION OF VINYL MONOMERS.. 1977. Paper presented at Int Symp on Cationic Polym, 4th, Akron, OH, USA, .
Kunitake, Toyoki ; Takarabe, Kunihide. / SPECTROSCOPIC OBSERVATION OF THE PROPAGATING SPECIES IN THE CATIONIC POLYMERIZATION OF VINYL MONOMERS. Paper presented at Int Symp on Cationic Polym, 4th, Akron, OH, USA, .6 p.
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N2 - In the reported experiments, the reaction of several vinyl aromatic monomers with CF//3SO//3H and H//2SO//4 was carried out in dichloroethane at 30 degree C. The rapid formation of the cationic species was followed by the stopped-flow method, and the transient species were identified by rapid-scan spectra and rapid quenching of the reaction mixture. The monomeric cation was formed predominantly in the reaction of 1,1-diphenylethylene and excess CF//3SO//3H; however, an indanic dimer was formed in the presence of excess diphenylethylene. The rate constant for the formation of the cationic species was (3 similar 4) multiplied by 10**3M** minus **1. sec** minus **1. On the other hand, the reaction of diphenylethylene and H//2SO//4 produced two short-lived species: the monomeric cation and, probably, a monomeric radical cation. The transient species (lifetime similar 50 msec) were similarly observed in the reaction of CF//3SO//3H with styrene, methylstyrenes, and indene. General discussion is included in the paper.

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