Abstract
Abstract Migration in rubber is a general phenomena of practical importance. A basic program using radiotracers was undertaken to help understand this migration and establish a rating system to allow the compounder to predict the behavior of a given oil from its molecular structure and that of the elastomer. The aromatic portion of a 14C labelled aromatic oil was separated into fractions of relatively narrow molecular-type distribution by silica gel solid—liquid chromatography. Static migration studies were made in natural rubber, SBR, cis-polybutadiene and emulsion polybutadiene rubber over the temperature range 50–125° C. Computer-derived diffusion coefficients were calculated, normalized by a least squares technique and used to calculate migration activation energies and to correlate the diffusivity of the oil fractions with degree of aromatic condensation. The data obtained indicate that moderate variations in the molecular composition of the aromatic components of an extender oil would have only a minor effect on the migration characteristics of the total oil.
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