A study of conformational stability of polyglycine and poly(L-alanine), and polyglycine/poly(L-alanine) blends in the solid state by C-13 cross-polarization/magic angle spinning NMR

C-13 Cross-Polarizarion/Magic Angle Spinning nmr and T-1pH experiments of p olyglycine (PG), poly(L-alanine) (PLA), and PG/PLA blends prepared from dic hloroacetic acid solution have been carried out, in order to elucidate the conformational stability of these polypeptides in the solid state. From the se experimental results, it was clarified that the conformations of PG and PLA in their blends are strongly influenced by intermolecular hydrogen-bond ing interactions that cause their miscibility at the molecular level. (C) 2 000 John Wiley & Sons, Inc.