Preparation, Structure, and Properties of Advanced Polymer Composites with Long Fibers and Nanoparticles
Author | : Gang Zhou |
Publisher | : |
Total Pages | : 257 |
Release | : 2007 |
Genre | : |
ISBN | : 9781109863819 |
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Fiber-reinforced plastics have been widely used in many civil and military applications. In this research, the relationship of processing, structure, and property of carbon or glass fiber reinforced epoxy composites were studied. It is found that humidity has great impacts on the glass transition temperature, resin viscosity, curing kinetics, and tack property of epoxy prepregs, which may significantly affect the processing and the structure of products. The mechanism of marcel formation (fiber buckling) during compression molding was also investigated. Based on the experimental data, a statistic model was build to estimate the marcel size in the epoxy composites. The model can be also used to determine the proper processing parameters, such as mold temperature and pressure rate, to eliminate the fiber waviness. In addition, the ultrasonic consolidation of epoxy prepregs was compared with ordinary vacuum debulking at room temperature or high temperature. The results shows the ultrasonic consolidation is a promising method to lower the void content in the composites, and may replace the common debulking process in production.