O~E of the main problems of modern polymer physics is the determination of relationships between the properties of individual macromolecules and the properties of macromolecules in a sohd body Although theories of structure and properties of macromolecules in dilute solutions are now being actively developed, their results cannot be applied to the properties of bulk polymers firstly because the effects of molecular interaction are not taken into account in dilute solutions. Molecular influences the behaviour of chains and their conformations in a solid polymer, which differ substantially from the conformations of individual chains. From this point of view considerable interest is at tached to the explanation of the problem of how the properties of individual macromolecules are transferred to the properties of a polymer body and how this occurs. Relatively little information of this kind is available in the literature. I t was reported in some studies [1-9] that, in addition to the main changes involved in glass transition, further temperature transitions in polymers were observed as anomalies in the temperature dependence of some properties. Similar transitions were observed both in pure polymers and in solutions [2, 3, 8, 9] Thus, an additional conformation transition, for example for bulk-polymerized polystyrene appears as: a diffuse maximum near 50 ° on the curve of differential thermal analysis (DTA) [7], clear drop in internal pressure (i e cohesive energy) [5], an increase in the Bragg distances between the phenyl groups [6], a discontinuity in dilatometric linearity [4]. In solutions similar transitions were shown in the form of anomalous dependence on temperature [3] of intrinsic viscosity and globule dimensions (~2)1/2 [3, 9], tangent of dielectric loss angle [1, 2], decrease in chain anisotropy, decrease in surface tension [8] and appearance of a discontinuity in the dilatometric linearity [4]. Daane and Barker [4] found transitiSn temperatures for cellulose esters and concluded that these temperatures arc subject to a variation in the molecular mechanism of macromolecular motion. Thus, a minimum number of possible conformations corresponds to the lower