ABSTRACT
The Gaussian molecular model for the description of systems of macromolecular chains is presented. The long polymeric chains each made of a large number of units interacting between them can obtain many different conformations all of which determine the average macroscopic behaviour. Microscopic parameters in terms of which the macroscopic properties will be analyzed are the number N of units of each chain, proportional to the length and the molecular weight M of the chains and the intensity u of the interactions between the units of the chains. Perturbation theory in the parameter u is used and the series of one loop diagrams is summed for the determination of the partition function and the pressure of the system of n chains occupying a volume V. Comparison with experimental results are included
