Abstract
The flow birefringence (FBR) of solutions in sulphuric acid of a number of poly- p-benzamide (PPBA) specimens have been investigated and the intrinsic viscosities [ n] of the same solutions have been measured. The characteristic values of FBR [ n] and of the angles of orientation [ x/g] have been determined for the solutions investigated. The molecular weight, M, has been calculated for all the PPBA specimens studied from a comparison of the values of [ x/g] and [ n]. The relationships obtained, [ n]=1.6 × 10 −5 × M 1.7 and D r=2 × 20 15 × M 2.7, indicate that the conformation of PPBA molecules in solution is approximately rod-like. By use of the theory of the optical a nisotropy of persistent chains, quantitative data about the equilibrium rigidity of PPBA molecules been otained from a comparison of the characteristic values of [ n] and [ x/g]. It is shown that the number of monomeric links in the statistical chain segment of PPBA, S, is 320 and the corresponding length of the segment, A, is 2000 Å.
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