The conformational and intermolecular contributions to the residual enthalpy Delta H-0 and entropy S-0(a) at 0 K for amorphous nylon-6 and nylon-6,6 were investigated on the basis of the derivation of a new relationship between C-p, and C-v. It was found that Delta H-0, contains only the intermolecular enthalpy for CONH residues in amorphous nylon-6 acid nylon-6,6. The conformational contribution to S-0(a) consists, on the basis of the conformations, of 49 kinds of rotational isomeric states for nylon-6 and 2401 (49 x 49) kinds for nylon-6,6, independently of temperature. The intermolecular contributions to S-0(a) are only due to CONH residues in these polymers. Next, through the investigation of the conformational contributions to the glass transition, the possibility of ordered regions in nylon-6 and nylon-6,6 glasses was explored. The existence of localized and ordered parts with enthalpies of 40.1 kJ mol(-1) for nylon-6 and 80.7 kJ mol(-1) for nylon-6,6 is predicted. The enthalpies of the localized ordered parts are somewhat larger than the glass transition enthalpies of 37.6 kJ mol(-1) for nylon-6 and 75.2 kJ mol(-1) for nylon-6,6, respectively.