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ndltd-OhioLink-oai-etd.ohiolink.edu-osu11732870752021-08-03T05:52:04Z Preparation, structure, and properties of advanced polymer composites with long fibers and nanoparticles Zhou, Gang 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. 2007-03-08 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1173287075 http://rave.ohiolink.edu/etdc/view?acc_num=osu1173287075 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
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NDLTD
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English
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NDLTD
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| author |
Zhou, Gang
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Zhou, Gang
Preparation, structure, and properties of advanced polymer composites with long fibers and nanoparticles
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| author_facet |
Zhou, Gang
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| author_sort |
Zhou, Gang
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| title |
Preparation, structure, and properties of advanced polymer composites with long fibers and nanoparticles
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| title_short |
Preparation, structure, and properties of advanced polymer composites with long fibers and nanoparticles
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| title_full |
Preparation, structure, and properties of advanced polymer composites with long fibers and nanoparticles
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| title_fullStr |
Preparation, structure, and properties of advanced polymer composites with long fibers and nanoparticles
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| title_full_unstemmed |
Preparation, structure, and properties of advanced polymer composites with long fibers and nanoparticles
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| title_sort |
preparation, structure, and properties of advanced polymer composites with long fibers and nanoparticles
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The Ohio State University / OhioLINK
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2007
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http://rave.ohiolink.edu/etdc/view?acc_num=osu1173287075
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AT zhougang preparationstructureandpropertiesofadvancedpolymercompositeswithlongfibersandnanoparticles
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1719426813635067904
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