New telechelic polymers and sequential copolymers by polyfunctional initiator-transfer agents (inifers) - 8. The effects of polymerization conditions on the functionality of telechelic polyisobutylenes

Victor S C Chang, Joseph P. Kennedy, B. Iván

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30 Citations (Scopus)

Abstract

The possibility of undesirable intramolecular cycloalkylation exists in the polymerization of iso-butylene induced by the p-dicumyl chloride/BCl3 inifer system. A scheme has been proposed which shows the sequence of reactions leading to indane skeletons. The structure of the indane derivatives has been characterized by 1H NMR spectroscopy. Systematic experiments have been carried out using low isobutylene and high p-dicumyl chloride concentrations leading to polyisobutylene oligomers needed for accurate endgroup analysis. The effect of temperature, solvent composition (polar/nonpolar), isobutylene and BCl3 concentration on the extent of indane skeleton formation has been investigated. Indane skeleton formation can be completely suppressed by the use of relatively non-polar media, e.g., 1:1 mixture of CH2Cl2 :n-C6H14, at or below -40°C, and conditions under which symmetrical telechelic polyisobutylenes can be obtained have been defined.

Original languageEnglish
Pages (from-to)339-346
Number of pages8
JournalPolymer Bulletin
Volume3
Issue number6-7
DOIs
Publication statusPublished - Nov 1980

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butenes
initiators
musculoskeletal system
Oligomers
Nuclear magnetic resonance spectroscopy
Chlorides
copolymers
Polymers
Copolymers
polymerization
Polymerization
Derivatives
polymers
Chemical analysis
chlorides
polyisobutylene
Experiments
oligomers
Temperature
nuclear magnetic resonance

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry

Cite this

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abstract = "The possibility of undesirable intramolecular cycloalkylation exists in the polymerization of iso-butylene induced by the p-dicumyl chloride/BCl3 inifer system. A scheme has been proposed which shows the sequence of reactions leading to indane skeletons. The structure of the indane derivatives has been characterized by 1H NMR spectroscopy. Systematic experiments have been carried out using low isobutylene and high p-dicumyl chloride concentrations leading to polyisobutylene oligomers needed for accurate endgroup analysis. The effect of temperature, solvent composition (polar/nonpolar), isobutylene and BCl3 concentration on the extent of indane skeleton formation has been investigated. Indane skeleton formation can be completely suppressed by the use of relatively non-polar media, e.g., 1:1 mixture of CH2Cl2 :n-C6H14, at or below -40°C, and conditions under which symmetrical telechelic polyisobutylenes can be obtained have been defined.",
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AU - Iván, B.

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N2 - The possibility of undesirable intramolecular cycloalkylation exists in the polymerization of iso-butylene induced by the p-dicumyl chloride/BCl3 inifer system. A scheme has been proposed which shows the sequence of reactions leading to indane skeletons. The structure of the indane derivatives has been characterized by 1H NMR spectroscopy. Systematic experiments have been carried out using low isobutylene and high p-dicumyl chloride concentrations leading to polyisobutylene oligomers needed for accurate endgroup analysis. The effect of temperature, solvent composition (polar/nonpolar), isobutylene and BCl3 concentration on the extent of indane skeleton formation has been investigated. Indane skeleton formation can be completely suppressed by the use of relatively non-polar media, e.g., 1:1 mixture of CH2Cl2 :n-C6H14, at or below -40°C, and conditions under which symmetrical telechelic polyisobutylenes can be obtained have been defined.

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