Les propriétés diélectriques des polymères en solution II.—Etude des solutions de polyméthacrylate de méthyle dans le toluène

Abstract

SUhlMARYDielectric constants and loss factors have been measured for dilute solutions of methyl poly-methacrylates in toluene and benzene. The molecular weight varied from 14.000 to 1.750.000, the frequencies used ranged from .01 to 35 megacycles, the temperatures from -300 to 25OC.It has been shown that:l o ) The critical frequency and the free energy of activation were 2") The entropy of activation was small and negative. 3 0 ) The static dielectric constant was, for a given concentration, 40)The mean quadratic dipole moment was proportional to the square pmc-tically independant of the degree of polymerisation.independant of molecular weight.root of the molecular weight of the polymer.