Abstract
The effect of solvents on the structure and mechanical properties of cast films of poly(γ-methyl D-glutamate) (PMDG) was studied. The solvents used were chloroform, dichloromethane, 1,2-dichloroethane, and N,N-dimethylformamide. From X-ray diffraction measurements, it was found that films cast from chloroform and dichloromethane had a well-ordered structure consisting of α-helices packed on a regular hexagonal lattice, while films cast from N,N-dimethylformamide showed far less crystallinity. Circular dichroic studies showed that only those films cast from 1,2-dichloroethane maintained the same relative molecular disposition as in the cholesteric liquid crystal structure of the concentrated solution. The difference in the structure was reflected in the mechanical properties. Three types of relaxation phenomena were observed in the temperature range from 100 to 250°C, and they have been designated α1, α2, and α3, dispersions in order of increasing temperature. These dispersions may be attributed to the molecular relaxation in the different phases, respectively.
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Watanabe, J., Sasaki, S. & Uematsu, I. Structure and Mechanical Properties of Poly(γ-methyl D-glutamate) Films. I. Influence of the Casting Solvents. Polym J 9, 451–458 (1977). https://doi.org/10.1295/polymj.9.451
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DOI: https://doi.org/10.1295/polymj.9.451
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