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Functionality distribution of hydroxyl‐terminated polybutadienes using gel permeation chromatography. I. The method and calibration procedure
Author(s) -
Anderson J. N.,
Baczek S. K.,
Adams H. E.,
Vescelius L. E.
Publication year - 1975
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1975.070190817
Subject(s) - derivatization , molar mass distribution , gel permeation chromatography , calibration , derivative (finance) , hydroxyl value , chemistry , chromatography , analytical chemistry (journal) , materials science , polymer chemistry , polymer , organic chemistry , high performance liquid chromatography , mathematics , polyol , statistics , financial economics , economics , polyurethane
A method for simultaneously determining the molecular weight averages, molecular weight distribution, hydroxyl equivalent weight, functionality averages, and functionality distribution of hydroxyl‐terminated polybutadienes using GPC has been developed. The method is based on the preparation of a UV absorbing derivative of the hydroxyl group and GPC analysis using dual differential refractive index and UV detectors. In order to determine the hydroxyl equivalent weight, quantitative derivatization of the hydroxyl group is required. If the equivalent weight can be determined by an independent method, the derivatization reaction can be less than quantitative if sufficient UV absorptivity can be obtained. The procedure used for calibrating the GPC columns and UV detector are presented. Equations for calculating number‐ and weight‐average functionalities from GPC data were also developed. The number‐average functionality is independent of the functionality distribution, but the weight‐average functionality is dependent upon the distribution of functionality. The ratio of the weight‐average to number‐average functionality is indicative of how the functionality is skewed as a function of molecular weight.