Abstract
Laser Raman spectra of block copolymers of L-alanine and D,L-lysine in the solid state, in salt-free water, and in aquebus salt solutions were obtained. Under all these conditions, the spectra were sensitive to the conformational states of the polymers. In addition, the spectra in aqueous salt solutions indicated the presence of interactions not present in salt-free water and were consistent with an earlier suggestion that, in the presence of salt, the shielding of the charges of the poly(D,L-lysine) end blocks permits the central poly(L-alanine) block to adopt a hairpin-like conformation (with the a helices folded back and forth) which is stabilized by side-chain to side-chain methyl-methyl hydrophobic bonding.
| Original language | English |
|---|---|
| Pages (from-to) | 539-543 |
| Number of pages | 5 |
| Journal | Macromolecules |
| Volume | 4 |
| Issue number | 5 |
| DOIs | |
| State | Published - 1 Sep 1971 |
| Externally published | Yes |