CONFORMATION AND MOLECULAR-MOTION OF A POLY(L-GLUTAMATE) WITH LONG N-ALYL SIDE-CHAINS IN THE SOLID-STATE AND THE LIQUID-CRYSTALLINE STATE AS STUDIED BY HIGH-RESOLUTION C-13 NMR-SPECTROSCOPY .2.

C-13 CP/MAS and PST/MAS NMR experiments are carried out on poly(gamma-n-octadecyl L-glutamate) (POLG) over a wide range of temperatures from -40 to 230-degrees-C to elucidate dynamical and conformational features in the solid state and the liquid-crystalline state, in addition to the experimental findings reported previously. From these experimental results it was found that as the temperature is increased and the methylene carbons of the n-alkyl side-chains are away from the main-chain, the gauche fraction is increased but the magnitude of its temperature change is decreased. Furthermore, from the experimental results on the temperature dependence of the C-13 chemical shift of the main-chain carbonyl carbon, it was found that the main-chain takes the right-handed alpha-helix form in the temperature range from -40 to 230-degrees-C, and that as the temperature is increased, the amide hydrogen-bond length in the main-chain is increased slightly.