Investigation of molecular interactions in selected liquid diols and their diesters by optical Kerr effect and Brillouin light scattering

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Abstract
Optical methods, which are noninvasive and require small volumes of substance studied, are particularly useful for investigation of local structure and molecular interactions. These methods also proved suitable for investigation of monomers and polymers, which are so common in our civilisation and whose degradation poses an important problem in the aspect of the environment protection. Recognition of the processes taking place in polymers, in particular under the effect of optical irradiation, is a necessary prerequisite for design of materials of exactly predicted properties and able to undergo degradation after use. The paper reports results of investigation of a group of liquid aliphatic diols and their derivatives (unsaturated diesters belonging to dimethacrylanes) carried out using two optical methods the optical Kerr effect and Brillouin scattering. These compounds in the form of polymers have been commonly applied in microelectronics and optical waveguides. Temperature dependencies of these two effects have been studied in the range from 280 to 330K, determining in particular temperature changes of Kerr constants, hypersonic velocities and adiabatic compressibility. The values of the parameters measured were found to depend on the number of elements in the ester group and the temperature dependencies of hypersonic velocity, adiabatic compressibility, and optical Kerr constant were markedly non-linear. The results are presented in the form of tables and diagrams. A discussion of molecular interactions in the liquid esters studied and their relation to the changes in the local structure of the medium is also included.

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