شهره سادات محسنیان

Acrylonitrile butadiene rubber (NBR) composites are prepared from wastenylon 66 short fiber using a two-roll mill mixer. The effects of fiber contentand bonding agent on the mechanical and morphological properties of thecomposites are studied. The curing characteristics of the composites have been studiedby using cure rheometer. The cure and scorch time of the composites decrease whilecure rate is increased when short fiber content is increased. The mechanical propertiesof the composites show improvement in both longitudinal and transverse directions withincrease in short fiber content. The adhesion between the fiber and rubber is enhancedby using a dry bonding system consisting of resorcinol, hexamethylenetetramine andhydrated silica (HRH). The swelling behavior of the composites in N,N-dimethylformamideis tested to find the effect of bonding agent on adhesion strength of the matrixand fibers. Fracture surface morphology of composites is studied by scanning electronmicroscopy. The restriction to swelling is higher for composites containing bondingagent, especially, in the longitudinal direction. The morphology of the fracture surfaceshows less fiber pull out when the bonding agent is introduced