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Local order in polyelectrolytic solutions detected by magnetic birefringence measurements on the (Tyr‐Glu) n copolymer
Author(s) -
Maret G.,
Domard A.,
Rinaudo M.
Publication year - 1979
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.1979.360180110
Subject(s) - birefringence , chemistry , polymer , ionic bonding , copolymer , order (exchange) , condensed matter physics , chemical physics , crystallography , nuclear magnetic resonance , optics , ion , physics , organic chemistry , finance , economics
The local electrostatic order in polyelectrolytic solutions has been studied by magnetic birefringence measurements on short segments ( n ∼ 34) of the (Tyr‐Glu) n polypeptide in high magnetic fields up to 13 T. We give evidence that only above a critical polymer concentration do small domains exist within which the polymers show a parallel ordering. This structural order disappears suddenly at ionic strengths above about 5 × 10 −2 M and above a melting temperature of about 50°C.