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Preparation, structure, and properties of advanced polymer composites with long fibers and nanoparticles

Zhou, Gang
http://rave.ohiolink.edu/etdc/view?acc_num=osu1173287075

Abstract Details

2007, Doctor of Philosophy, Ohio State University, Chemical Engineering.
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. Polymer nanocomposites have become one of the frontiers of materials sciences since the 1990s. In this study, epoxy, phenolic, and unsaturated polyester nanocomposites were prepared. Mechanical, thermal, and/or barrier properties of these nanocomposites were compared to neat resins. It is found that the addition of nanoparticles, such as nanoclays or carbon nanofibers, into polymer matrix can improve the strength and modulus, enhance the thermal stability, and lower the water absorption rate. Furthermore, great efforts have been made to combine the advantages of both fiber-reinforced plastics and polymer nanocomposites to produce a superior composite: long fibers and nanoparticles reinforced polymer composites. According to the characteristics of different polymer resins (epoxy, phenolic, and unsaturated polyester resins) and long fibers (glass or carbon fibers), several processes were selected to prepare various hybrid composites, such as compression molding and vacuum assisted resin transfer molding. The mechanical and thermal properties of these long fiber-nanoparticle reinforced composites were also measured. The significant improvement of these properties can be attributed to the synergic effects of long fiber and nanoparticles. In addition, nanoparticles brought some other properties to polymer materials, such as enhanced barrier properties.
Ly Lee (Advisor)

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Citations

  • Zhou, G. (2007). Preparation, structure, and properties of advanced polymer composites with long fibers and nanoparticles [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1173287075

    APA Style (7th edition)

  • Zhou, Gang. Preparation, structure, and properties of advanced polymer composites with long fibers and nanoparticles. 2007. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1173287075.

    MLA Style (8th edition)

  • Zhou, Gang. "Preparation, structure, and properties of advanced polymer composites with long fibers and nanoparticles." Doctoral dissertation, Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=osu1173287075

    Chicago Manual of Style (17th edition)

osu1173287075
9,189
© 2007, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.