EFFECT OF A MESOPOROUS SILICA AND SILANE COUPLING AGENTS ON THE REINFORCING OF STYRENE BUTADIENE RUBBER

摘要

Templated mesoporous silica (TMS) used as filler for SBR showed better mechanical properties for non vulcanized samples due to the polymer chains penetration within the mesopores. The reinforcement increases when TMS is used together with silane coupling agents (SiCA). The reinforcing and vulcanization kinetics on the SBR are studied with two silicas: conventional VN3 and TMS and two SiCA. The reinforcing is measured by the vulcanization degree and the mechanical properties. The swelling degree, elastic modulus and glass transition temperature (T_g) are higher for samples containing TMS. On the other hand the use of SiCA results in further increase of the swelling degree and therefore higher T_g with both silicas. The vulcanization kinetics of the SBR is evaluated by rheometry and differential scanning calorimetry. The vulcanization rate is higher for the rubber filled with TMS indicating its autocatalytic effect. The use of SiCA decreases the cure rate and the maximum torque values.