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Morphology and Properties of Clay/Nylon-6-Epoxy Nanocomposities Coatings and Films

Vyas, Aniket
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1414750283

Abstract Details

2014, PhD, University of Cincinnati, Engineering and Applied Science: Materials Science.
This research is focused on the synthesis, characterization and properties of epoxy based coatings, blended and cured with thermoplastic nylon-6 and organoclay modified nylon-6. Epoxy resins has 2 major drawbacks: (1) extremely brittle nature and (2) moisture absorption. The first problem is solved by incorporation of nylon-6 in epoxy, and the second problem is solved by incorporation of nano-clay in the nylon-6/epoxy system. A novel polymerization process of synthesizing nylon-6 in solution was developed in this work, which resulted in simple and efficient process of blending nylon-6 with epoxy resin resulting in homogenous blends of nylon-6 with epoxy. The storage modulus in glassy region for nylon-6/epoxy composites decreased linearly as nylon-6 weight % increased, along with decrease in glass transition temperature from 70 ?C to 30 ?C. The storage modulus in rubbery region increased compared to control epoxy. The control epoxy used in the system was water based EPIREZ5522-WY-55, thermally heated without using curing agent. The curing agent was not used to study the effect of nylon-6 on storage modulus in rubbery region. These results indicated that sole nylon-6 increased cross-link density of epoxy resin, which was further verified by determining fractional epoxy conversion by monitoring characteristic epoxy peak at 914 cm-1 in FTIR, which increased with increase in nylon-6 wt.%. The nylon-6/epoxy coatings applied on Al-2024 T3 substrate were tested for anti-corrosion. The coating containing 10% of nylon-6 in epoxy showed the best performance, compared to other compositions, thermally heated epoxy coating and epoxy-amine system. Comparison with formulation cured by thermal treatment of epoxy showed that nylon-6 alone without standard curing agent is effective in improving the properties, while comparison with standard epoxy-amine system suggested that the novel technology can be effectively used in practical applications. Then clay/nylon-6 nanocomposites were synthesized using in-situ solution polymerization. As the concentration of clay was increased to 0.5 % by weight, molecular weight of nylon-6 increased from 10362 g/mol to 10659 g/mol. On further increasing clay weight %, the molecular weight of nylon-6 decreased. The melting point of nylon-6 increased from 209 to 217 ?C on addition of clay at 0.5 weight%. But on increasing clay to 1 wt%, it decreased with broadening in peak. On further increasing clay, the melting peak was not observed. The d-spacing in clay galleries increased from 34.48 to 45.26 A? in clay/nylon-6 nanocomposites. Then clay/nylon-6-epoxy nanocomposites were prepared for improving thermo-mechanical and corrosion inhibition properties of epoxy matrix. The storage modulus in glassy as well as rubbery region were found to increase upto a clay concentration of 1 weight% with respect to nylon-6, while after that it began to decrease. The incorporation of clay in nylon-6/epoxy coating showed significant improvement in the anti-corrosion properties of coatings. The corrosion current reduced by 4 orders of magnitude in Direct Current Polarization tests, while impedance value increased by 2 orders of magnitude as observed in Bode plots.
Jude Iroh, Ph.D. (Committee Chair)
F James Boerio, Ph.D. (Committee Member)
Raj Manglik, Ph.D. (Committee Member)
Rodney Roseman, Ph.D. (Committee Member)
303 p.
Materials Science
EPOXY; NYLON-6; NANOCLAY; MORPHOLOGY; THERMO-MECHANICAL PROPERTIES; ANTI-CORROSION

Recommended Citations

Citations

  • Vyas, A. (2014). Morphology and Properties of Clay/Nylon-6-Epoxy Nanocomposities Coatings and Films [Doctoral dissertation, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1414750283

    APA Style (7th edition)

  • Vyas, Aniket. Morphology and Properties of Clay/Nylon-6-Epoxy Nanocomposities Coatings and Films. 2014. University of Cincinnati, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1414750283.

    MLA Style (8th edition)

  • Vyas, Aniket. "Morphology and Properties of Clay/Nylon-6-Epoxy Nanocomposities Coatings and Films." Doctoral dissertation, University of Cincinnati, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1414750283

    Chicago Manual of Style (17th edition)

ucin1414750283
309
© 2014, some rights reserved.Creative Commons License Morphology and Properties of Clay/Nylon-6-Epoxy Nanocomposities Coatings and Films by Aniket Vyas is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Cincinnati and OhioLINK.
Release 3.2.12