Application of gel‐permeation chromatography to studies of the functionality distribution of carboxy‐ and hydroxy‐polybutadienes

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Separations of carboxy‐polybutadienes and hydroxy‐polybutadienes according to functionality have been effected using stepwise elution from silica gel. Recoveries in the 95–100% range have been achieved. Subjection of the fractions obtained from the silica gel separation to analysis via gel‐permeation chromatography and infrared or near‐infrared spectroscopy yields not only functionality distribution data, but also provides the relationship between molecular weight distribution and functional type. Analytical techniques and interpretation of data are discussed.