CORRELATIONS OF RELAXING DIPOLE ENTITIES AND CONDUCTIVITY EFFECTS ON MODEL COMPOUNDS AND MOLECULAR CHAINS WITH 2-CHLOROCYCLOHEXYL ESTERS INTHEIR STRUCTURE

The temperature and frequency dependence of the complex dielectric per mittivity epsilon for both 2-chlorocyclohexyl isobutyrate (CCHI) and poly(2-chlorocyclohexyl acrylate) (PCCHA) is reported. The polymer exh ibits an ostensible beta relaxation, centered at -60-degrees-C at 5 Hz , whose activation energy at constant frequency seems to increase with temperature followed by a glass-rubber relaxation or a process, cente red at 70-degrees-C at 5 Hz, in which conductive processes become domi nant at low frequencies. The model compound only exhibits a glass-liqu id relaxation whose maximum is located at -92-degrees-C at 1 Hz. The a nalysis of the dielectric results in terms of the electric modulus sug gests that whereas the conductive processes in CCHI are produced only by free charges, the conductivity observed in PCCHA involves both free charges and interfacial phenomena. The experimental intramolecular di polar correlation g(intra) is somewhat larger than 1 for both CCHI and PCCHA, suggesting that correlations of orientation enhance the polari ty of these systems. A 4 X 4 rotational states scheme which accounts f or two rotational states about the CH-CO bonds of the side group repro duces very satisfactorily the intramolecular correlation coefficient o f the polymer. Finally, the critical interpretation of the dielectric results obtained in the bulk indicates that intermolecular dipolar int eractions do not play a significant role in the dielectric behavior of these systems.