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Corrosion Behavior of Epoxy Ester Urea Hybrid Nanocomposites Containing Clay and Organo Silanes Prepared by In Situ Processing

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2016, MS, University of Cincinnati, Engineering and Applied Science: Materials Science.
A novel polymer nanocomposite system, which consists of polyurea, epoxy ester, clay and organo silanes, has been synthesized by in situ polymerization of urea in the presence of clay followed by solution blending of the product of reaction with water dispersable epoxy resin, aminosilane and epoxysilane. The nanocomposites were fully characterized in order to determine the chemical components, morphology, mechanical properties and anti-corrosion properties. The performances of the nanocomposite films and coatings assessed are compared to the performance of thin films and coatings prepared by using the ex situ processing method. Samples prepared by using the in situ processing method show a greatly improved clay dispersion in the polymer matrix. Fourier transform infrared spectroscopy (FTIR) was applied to study the chemical bonds of the nanocomposite. Scanning electron microscope (SEM) was used to observe the appearance of the film cross-sections. Dynamic mechanical analysis (DMA) was used to evaluate the mechanical properties, such as the storage modulus (E’), and the damping ability. Electrochemical impedance spectroscopy (EIS) and direct current polarization test (DCP) were used to study the anti corrosion properties. Conventional industrial tests, including bare eyes observation, methyl ethyl ketone (MEK) resistance test, dry adhesion test and impact test, which are international standard tests set by the American Society for Testing and Materials (ASTM), were applied to further explore the performance of coating samples in the level of industrial application. Samples prepared by in situ methods show the FTIR absorption band for secondary amine, N-H functional group, indicating the successful formation of polyurea. SEM picture shows a homogeneous fracture surface of the nanocomposite film. Dynamic mechanical analysis shows a wider range for the glass transition temperature of the nanocomposites prepared by the in situ method, indicating a better damping ability. Also, coatings prepared by the in situ method met the ASTM standards of curing and surface adhesion. Electrochemical impedance spectroscopy (EIS) and direct current polarization (DCP) tests indicate that the nanocomposite coatings prepared by the ex situ method have superior anti corrosion properties than the samples prepared by the in situ method. The coating samples prepared by both methods have displayed the intriguing characteristic that instead of deteriorating, the anti-corrosion ability will improve after exposure to a corrosive environment.
Jude Iroh, Ph.D. (Committee Chair)
Gregory Beaucage, Ph.D. (Committee Member)
Raj Manglik, Ph.D. (Committee Member)
125 p.

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Citations

  • Zhang, Y. (2016). Corrosion Behavior of Epoxy Ester Urea Hybrid Nanocomposites Containing Clay and Organo Silanes Prepared by In Situ Processing [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1471347621

    APA Style (7th edition)

  • Zhang, Yujie. Corrosion Behavior of Epoxy Ester Urea Hybrid Nanocomposites Containing Clay and Organo Silanes Prepared by In Situ Processing. 2016. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1471347621.

    MLA Style (8th edition)

  • Zhang, Yujie. "Corrosion Behavior of Epoxy Ester Urea Hybrid Nanocomposites Containing Clay and Organo Silanes Prepared by In Situ Processing." Master's thesis, University of Cincinnati, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1471347621

    Chicago Manual of Style (17th edition)