Migration of Paraffin Wax to Sulfur Vulcanized Styrene-Butadiene Rubber (SBR) Surface: Effect ofTemperature

摘要

Because of the low molecular weight of some additives (e.g.,' antiozonants) in the vulcanized styrene-butadiene rubber (SBR) formulation, they are able to migrate and diffuse to the surface creating a weak boundary layer which is deleterious to adhesion. However, the factors favouring or inhibiting the migration of antiozonants to the vulcanized SBR surface have not been fully understood. This work was conducted to determine the influence of die temperature on the migration of antiozonant paraffin wax to the surface of a commercial sulphur vulcanized styrene-butadiene rubber. The antiozonant migration experiments were performed for 15 hours in an oven at different temperatures ranging from 40° to 90°C. The changes in the vulcanized SBR surface were monitored by ethylene glycol contact angle measurements, ATR-IR spectroscopy and scanning electron microscopy (SEM). Additionally, the weight loss of the vulcanized SBR after each heat treatment was recorded.