𝔖 Bobbio Scriptorium
✦   LIBER   ✦

The infuence of interchain compositional heterogeneity on the conformation in random copolymers of γ-benzyl-L-glutamate and L-valine

✍ Scribed by S. Deshmane; T. Hayashi; W. Sederel; J. M. Anderson

Publisher
Wiley (John Wiley & Sons)
Year
1978
Tongue
English
Weight
773 KB
Volume
17
Category
Article
ISSN
0006-3525

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Variation in the solvent used for the copolymerization of γ‐benzyl‐L‐glutamate and L‐valine N‐carboxyanhydrides provides copolymers which have variable interchain compositions, and this variation in interchain compositional heterogeneity is reflected in the solid‐state conformations of the respective copolymers. Poly[Glu(OBzl)^29^Val^71^] prepared in dioxane exhibits a β‐structure, whereas a copolymer of the same average composition prepared in benzene/methylene chloride shows predominantly an β‐helix conformation with a small amount of β‐structure. The use of the monomer reactivity ratio permits the calculation of the average and incremental copolymer compositions at any conversion; thus, correlations between conformation and interchain compositional heterogeneity can be made. In general, copolymers prepared in dioxane show a greater distribution of chain composition and therefore permit a wider variety of conformation than copolymers prepared in benzene/methylene chloride under identical conditions.

📜 SIMILAR VOLUMES

The random copolymerization of γ-benzyl-
The random copolymerization of γ-benzyl-L-glutamate and L-valine N-carboxyanhydrides: Reactivity ratio and heteogeneity studies
✍ W. Sederel; S. Deshmane; T. Hayashi; J. M. Anderson 📂 Article 📅 1978 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 785 KB

## Abstract The random copolymerization of the __N__‐carboxyhydrides of γ‐benzyl‐L‐glutamate and L‐valine using triethylamine as the initiator in low dielectric media reults in high‐molecular‐weight copolymers at low convenrson. This behavior makes it possible to apply the monomer reactivity ration

Correlation between the sequence-length
Correlation between the sequence-length distribution and structure of statistical copolymers of L-valine and γ-benzyl-L-glutamate
✍ V. Saudek; J. Stejskal; P. Schmidt; K. Zimmermann; V. Škarda; P. Kratochvíl; J. 📂 Article 📅 1987 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 1017 KB

Statistical copolymers were prepared from N-carboxyanhydrides of L-valine and y-benzyl-L-glutamate in dioxan with triethylamine as an initiator. The copolymerization conversion was determined by ir spectroscopy, the copolymer composition by amino acid analysis, and the molecular weights by light sca

Extent and stability of the α-helix in γ
Extent and stability of the α-helix in γ-benzyl L-glutamate–glycine copolymers
✍ H. Block; Josephine A. Kay 📂 Article 📅 1967 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 371 KB 👁 1 views

Block and random copolymers of y-benzyl Irglutamate and glycine were studied by optical rotatory dispersion methods in order to ascertain the extent and stability of the a-helix formed by these polymers in appropriate solvent mixtures. Results indicate that when in solution such polymers do contain

The β-conformation and association of lo
The β-conformation and association of low-molecular-weight poly-γ-benzyl-L-glutamate in Solutions
✍ Shoichi Ikeda; Toyoko Imae 📂 Article 📅 1972 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 701 KB

Three samples of poly--phensyl-L-glutamate have been prepared from r-henzyl-,Vcarhoxy-L-glutamate anhydride with n-hexylamine initiation a t anhydride-to-initiator molar ratios, [A]/[I], of 3, 4, and 8, and their conformation and association in ethylene dichloride and dioxane have been investigated

Electrooptical and dielectric investigat
Electrooptical and dielectric investigations on the conformation and the electrical properties of poly-γ-benzyl-L-glutamate in mixed solvents
✍ Hiroshi Watanabe; Koshiro Yoshioka; Akiyoshi Wada 📂 Article 📅 1964 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 474 KB 👁 1 views

The dielectric constant and the electric birefringence of poly-7-benzyl-L-glutamate in ethylene dichloride-dichloroacetic acid mixtures have been measured aa functions of the solvent composition. Thew properties undergo a marked decrease with the addition of a small amount of dichloroacetic acid, aa

The viscosity behavior and conformations
The viscosity behavior and conformations of low-molecular-weight poly-γ-benzyl-L-glutamate in various solvents
✍ Toyoko Imae; Shoichi Ikeda 📂 Article 📅 1973 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 987 KB

## Abstract Reduced viscosity and infrared spectra of low‐molecular‐weight poly‐γ‐benzyl‐L‐glutamate (which was prepared by polymerization of the __N__‐carboxyanhydride with __n__‐hexylamine initiation at [A]/[I] 3, 4, and 8) have been measured in various organic solvents. Infrared spectra indicate