Viscoelastic Properties of Polypropylene Reinforced with Mica inTαandTαcTransition Zones

[摘要] The viscoelastic properties of mica-reinforced polypropylene (PP) was studied in temperature range between −30°C and 120°C. WLF equation permits determining the free volume fraction inαandαctransitions regions. It was shown that the value of this parameter is lower forαctransition, indicating that the free volume and thermal expansion ofαregion is more than that ofαcregion. At a 40% loading level, it was shown that the storage and loss modulus of mica-filled PP increases dramatically (in comparison with the pure polypropylene). The relative modulus does not change significantly at glassy state but it increases for the temperature higher thanTg. It was also shown that mica does not affect the glass transition temperature but results in an increase inαctransition.

[学科分类] 材料工程