Nylon 66 was effectively toughened with potassium titanate whiskers which were surface modified with an elastic epoxy resin. When the content of epoxy resin was of 1.5 mass% of whiskers, impact stre ngth of the composite increased 132% compared with neat nylon, while bending and tensile strengths increased 55% and 48% respectively. Image gray level method was adopted to carry out fractal research of fracture surfaces of the composites. Fractal dimensional calculations were based on perimeter-area relation. The influence of the sizes of measured slit islands on result fractal dime nsions was discussed. It was found that with the area threshold of measured slit islands increasing, calculated fractal dimension increases first and becames st able after area threshold reaches about 500η2(η was yardstick). The relationships between mechanical properties of the composites and fractal dimensions of fracture surfaces were further examined. There was good consistence between mechanical properties and fractal dimension, which was explained from the fracture mechanism of composites and fracture morphology.
吕家桢、窦强、冯新、陆小华
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南京化工大学化学工程系
Dept. Of Chemical Engineering, Nanjing University of Chemical Technology
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