ISSN:
0025-116X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Temperature depenences of the pitch of cholesteric helix in solutions of poly(y-benzyl-L-glutamate) in N,N-dimethylformamide and N-methyl-2-pyrrolidone were measured for various molar masses of poly(γ-benzyl-L-glutamate). It was found that in N-methyl-2-pyrrolidone inversion of the cholesteric helix takes place, i. e., that the right-handed helix changes to the lefthanded one. By using an equation derived by Kimura, the temperatures at which the system has a nematic order were determined. The results obtained allow the statement that an important role in the inversion of the cholesteric helix in poly(γ-benzyl-L-glutamate) solutions is played by conformational changes in side chains of the polypeptide molecule.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1988.021890119