Mechanical and Morphological Properties of Short Nylon Fibre Reinforced NR/SBR Composites: Optimization of Interfacial Bonding Agent

作者：Soltani Sedigheh^*; Naderi Ghasem; Ghoreishy Mir Hamid Reza

来源：Iranian Polymer Journal, 2010, 19(11): 853-861.

• NR/SBR composites
• short nylon fibre
• dry bonding agent
• mechanical properties
• morphology

Nylon short fibres were incorporated in NR/SBR rubber matrix with and without a bonding system on a two-roll mill mixer. A dry bonding agent consisting of resorcinol, hexamethylene tetramine and hydrated silica (HRH) was chosen as the interfacial-bonding agent for this composite system. The effect of bonding agent content on the microstructure, mechanical and morphological properties of the composites was investigated. Samples were vulcanized at 150 degrees C using a hot press after determination of the curing characteristics. The cure and scorch times of the composites decreased with increasing bonding agent concentration, while the maximum torque values showed an increasing trend. The bonding agent not only provided a shorter curing time but also enhanced the mechanical properties of the composite. The scanning electron microscopy (SEM) of the composite fracture surfaces implied that the presence of bonding agent has led to the breakage of fibres and less dark holes indicating the pull out of fibres without bonding agent. The results of anisotropic swelling studies, carried out to analyze fibre/matrix interactions and also orientation of the fibres, showed that the restriction to swelling is higher for the composites containing bonding agent. Furthermore, the preferential orientation of the fibres was observed to be in the milling direction. For composites prepared with short fibres and different loading levels of bonding agent, the dependence of the storage modulus (G') on angular frequency followed a clear non-terminal behaviour.

• 出版日期2010-11