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End group determination in hydroxyl-telechelic polyisobutylenes by infrared spectroscopy

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Summary

A convenient method for the quantitative determination of terminal hydroxy functionality of linear α,ω-di (hydroxy) —polyisobutylene and tri-arm star α,ω,δ-tri(hydroxy) polyisobutylene has been developed and evaluated. The method involves infrared quantitation of the free OH absorption at 3640 cm−1 by the use of long path liquid cells in very dilute CCl4, solution (i.e., in a range where H bridges are absent) in conjunction with Mn determination (vapor phase osmometry or gel permeation chromatography). The results obtained by this method confirm earlier end-group analysis data obtained by more cumbersome methods and indicate that the number of OH end-groups in α,ω-di(hydroxy) polyisobutylene and α,ω,δ-tri (hydroxy)polyisobutylene produced by the inifer technique is 2.0±0.1 and 3.0±0.15, respectively.

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Chang, V.S.C., Kennedy, J.P. End group determination in hydroxyl-telechelic polyisobutylenes by infrared spectroscopy. Polymer Bulletin 9, 518–524 (1983). https://doi.org/10.1007/BF00265238

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Keywords

  • Polymer
  • Spectroscopy
  • Chromatography
  • Infrared Spectroscopy
  • CCl4