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Synthesis, characterization, properties, and derivatives of poly(starch‐ g ‐(1‐amidoethylene)). II. Measurement of molecular weights by ultracentrifugation
Author(s) -
Meister John J.,
Sha Mu Lan,
Richards E. Glen
Publication year - 1987
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.1987.070330602
Subject(s) - copolymer , molecular mass , molar mass distribution , sedimentation coefficient , analytical ultracentrifugation , aqueous solution , starch , polymer chemistry , chemistry , molecule , ultracentrifuge , partial specific volume , materials science , chromatography , polymer , organic chemistry , enzyme
Weight‐average molecular weights of samples of poly(starch‐ g ‐(1‐amidoethylene)) determined by ultracentrifugation range from 0.19 to 3.7 × 10 6 . These data show the copolymer to be a partially permeable coil in aqueous solution and to be formed at significantly higher molecular weights as the mole ratio of cerium(+ IV) to 2‐propenamide in the reaction mixture decreases. Sedimentation coefficients show no indications of distribution broadening from aggregation of copolymer molecules. Buoyancy factor and partial specific volume of the copolymers bracket the values of these variables for the backbone and sidechain.