The calculation of average functions of local conformations for a non‐interacting copolymer system with neighbor interactions

In the present paper a new treatment is given for the calculation of average conformations over a non‐interacting copolymer system, where two kinds of monomer units are present. It is based on the calculation of the arithmetical average partition function over a properly restricted class of distributions of A and B units. This method permits in principle any required degree of approximation and also may be extended to copolymer systems with three or more types of monomer units. Moreover, it has the advantage that any average of conformational functions may be calculated in a way which is formally analogous to the matrix method given by Lifson in the case of homopolymers.