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Poly(L-valine). Conformational dependence on the degree of polymerization: Infrared studies

✍ Scribed by Koichi Itoh; Gerald D. Fasman

Publisher
Wiley (John Wiley & Sons)
Year
1975
Tongue
English
Weight
551 KB
Volume
14
Category
Article
ISSN
0006-3525

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✦ Synopsis

Abstract

The infrared spectra of poly(L‐valine)'s with varying degrees of polymerization have been investigated, as well as copolymers of L‐alanine and L‐valine. The spectra of nujol mulls of various molecular‐weight poly(L‐valine)'s, isolated directly from the polymerization media, as well as spectra of these same samples after treatment with strong acid, are recorded. In the 700–250‐cm^−1^ region, bands at 543 and 414 cm^−1^ are found to increase with increasing degree of polymerization in the nujol mulls, but are missing in the acid‐treated samples. These bands are assigned to the L‐valine residues with an β‐helixlike local conformation. It is inferred that the polymerization proceeds initially in the β form, and after a critical degree of polymerization the chains adopt an appreciable amount of an α‐helixlike local conformation.

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