Abstract
The dynamic birefringence and intrinsic viscosity of polybutylisocyanate (PBIC) fractions in tetrachloromethane were investigated in a 400-fold range of molecular weights. The conformation of the PBIC molecules was found to vary from a straight rod to a Gaussian coil in the same solvent. The experimentally found relationship of [n/ η]= f( M) was used for determination of the equilibrium rigidity of the molecules based on the optical data. The general shape of the experimental curve of [n]/[ η]= f( M) is compared with existing birefringence theories for absolutely rigid and infinitely fine persistent chains.
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