Poly-methyl-0-alanine

These polymers, typical of polyamides with fewer than four main chain carbon atoms in the repeating unit, decompose before melting and have to be processed from solution. Several of the polymers may, however, be spun into fibres. Over thirty years ago Courtaulds produced silk-like fibres on an experimental commercial scale from poly-(L-alanine) and from poly-(a-methyl-L-glutamate). The latter material is also said to be in use as a synthetic leather in Japan. The... 

Sfi.F-Test 19.4B Write the formula for (a) the monomer of poly(methyl methacrylate), used in contact lenses (17) (b) two repeating units of polyalanine, the polymer of the amino acid alanine, CH,CH(NH2)COOH. 

Other commercially radiochromic films are poly(methyl methacrylate) (PMMA), cellulose triacetate (CTA),i polyamide (nylon) films, poly(vinyl butyrate) with pararosaniline and p-nitrobenzoic acid, and alanine films. The CTA films are undyed PMMA films are available undyed and dyed (red and amber). ... 

The synthetic polypeptides poly-L-alanine (—NH. CH(CH3). CO—)p (a form) and poly-y-methyl-L-glutamate... 

Table 5. Asymmetric addition of dodecanethiol to isopropenyi methyl ketone catalyzed by poly(S-alanine) (PLA ) and the terminal models, in chloroform at 35 C (22)...

Figure 25. Circular dichroism spectra of the classical polypeptide conformations extended into the vacuum ultraviolet region. Solid curve, a-helical pattern averaged from poly-L-alanine and poly(y-methyl-L-glutamate) data. Dashed curve, antiparallel /5-pleated sheet CD pattern due to films of Boc-(l -Ala)7-OMe [78]. Dotted curve, parallel /S-pleated sheet patterns were calibrated by solution spectra. Dash-dot curve, disordered collagen to provide a measure of a random structure. Reproduced, with permission, from [79].

Polycyclic aromatic hydrocarbons can interact with the carbonyl groups. The methyl group of the poly(L-alanine) side chain does not prevent electrostatic interaction (Fig. 8A). 

Figure 5-6. Structure of a-heUx of poly(L-alanine). (a) aj-helix (b) aji-helix. Methyl groups are represented by large circles. (From [5])...

A special case is the hydrogen-transfer polymerization of acrylamide or methacrylamide leading to a polyamide. The synthesis of an optically active, "partially stereoregular" poly-methyl-3-alanine by polymerization of methacrylamide with an optically active basic catalyst has been reported (24). 

G., and Scheraga, H.A., 1967, Conformational analysis of macromolecules. IV. Helical structure of poly-L-alanine, poly-L-valine, poly- 3-methyl-L-aspar-tate, poly-Y -methyl-L-glutamate, and poly-L-tyrosine, J. 

N 017 "Conformational Analysis of Macromolecules. IV. Helical Structures of PolyfL-alanine), Poly(L-valine), Poly(p-methyl-L-aspartate), Polyly-methyl-l.-glutamate),... 

Conformational Maps for Polysarcosine and Poly(/V-methyl-L-alanine)"... 

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