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Light‐scattering study of poly(hydroxy ester ether) in N , N ‐dimethylacetamide solution
Author(s) -
Cao X.,
Sessa D. J.,
Wolf W. J.,
Willett J. L.
Publication year - 2001
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.1268
Subject(s) - hydrodynamic radius , radius of gyration , dimethylacetamide , polymer chemistry , branching (polymer chemistry) , virial coefficient , dynamic light scattering , ether , polymer , chemistry , light scattering , theta solvent , static light scattering , solvent , scattering , materials science , copolymer , solvent effects , organic chemistry , thermodynamics , physics , nanoparticle , optics , nanotechnology
Static and dynamic light‐scattering techniques were used to study biodegradable thermoplastic poly(hydroxy ester ether) in N , N ‐dimethylacetamide (DMAc). A weight‐average molecular weight M W = 6.4 × 10 4 g/mol, radius of gyration R G = 9.4 nm, second‐virial coefficient A 2 = 1.05 × 10 −3 mol mL/g 2 , translational diffusion coefficient D = 1.34 × 10 −7 cm 2 /s, and hydrodynamic radius R H = 8.3 nm are reported. In addition, the effect of H 2 O on the polymer chain's conformation and architecture in a DMAc/H 2 O solution is evaluated. Results suggest that H 2 O makes the mixed solvent poorer as well as promotes polymer chain branching via intramolecular transesterification. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 1737–1745, 2001
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