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Evaluation of different branching functions used in the determination of random branching by GPC
Author(s) -
Ambler M. R.
Publication year - 1977
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.1977.070210622
Subject(s) - branching (polymer chemistry) , polymer , copolymer , divinylbenzene , materials science , calibration curve , styrene , polymer chemistry , chemistry , chromatography , composite material , detection limit
Three branching functions are evaluated for use in the measurement of random branching by GPC. Initial evaluations of the functions g 1/2 , g 3/2 , and h 3 were made by computer simulations of GPC experiments using published data of lightly and highly randomly branched polymers. Actual GPC experiments were then performed on characterized samples of lightly and highly branched styrene–divinylbenzene copolymers. The results indicate that h 3 adequately predicts branching and molecular weight at all branching densities, while g 1/2 is accurate only for lightly branched polymers and g 3/2 is accurate only for highly branched polymers. A means for predicting the M –[η] curve for branched polymers from the M –[η] calibration curve for linear polymer is proposed.