Dispersed phase behaviour of long chain end-substituted alkanes

Summary form only given. The studies reported have been carried out on the dielectric behaviour of dilute solutions of R₁(CH₂)nR₂, n ≥ 12 where R₁ and R₂ are highly dipolar groups. A recently developed chain doubling synthesis technique allows very low levels of homologous impurity to be achieved, hence providing essentially monodispersed material at large n. Association effects are described together with molecular configurational influences on ensemble average parameters such as the net dipole moment of these flexible molecules. The results are typified by the symmetrically substituted O₂N (CH₂)₁₂NO₂. In the extended trans-configuration this has zero net dipole moment while observa produces values commensurate with the NO₂ group moment indicating a large ensemble average bias toward a semi-folded configuration.