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Modified Alkyds for High Solids Coatings and Adhesives

Salata, Ryan Robert
http://rave.ohiolink.edu/etdc/view?acc_num=akron1491427043349745

Abstract Details

2017, Doctor of Philosophy, University of Akron, Polymer Engineering.
Alkyd Resins are a class of seed-oil based polyesters used in the coatings industry for solventborne architectural and wood coatings, but are inferior in performance to petroleum-based resins. Solventborne coatings contain large quantities of volatile organic compounds (VOCs), which contribute to hazardous emissions. Another major drawback is the slow autoxidative crosslinking mechanism, which is catalyzed by toxic cobalt driers. This work targets the three major drawbacks of alkyds to develop high performance and high solids alkyds with improved drying times. In the first part, triethoxysilane modified alkyds were prepared as an additive to medium linseed oil alkyd. The alkoxysilane forms covalent bonds with oxidized metal substrates, improving coating’s adhesion. The low surface energy of silicon shifted the contact angle from hydrophilic to hydrophobic surface wetting, leading to improved coating properties in comparison to an alkyd control. The corrosion resistance was examined with electrochemical impedance spectroscopy, unexpectedly showing an increase in barrier performance when immersed in a 3.5 wt.% NaCl solution. Solid-state 29Si NMR spectroscopy detected a structural change in coatings immersed in salt solution, forming more crosslinked siloxane networks. In the second part, a fluorinated linseed oil alkyd (FLOA) with a fluorinated repeat unit in the polyester backbone was prepared for anti- graffiti coatings. Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX) showed the formation of fluorinated domains and a partial migration of fluorine to the coatings surface, thus preserving the coating’s adhesion to the substrate. FLOA coatings increased hydrophobicity, coating performance, corrosion resistance, and ultimately graffiti resistance. In the final two sections, visible light-curable alkyds and uralkyds were studied for coatings and adhesives. The use of photoinitiators and a photosensitizer was able to reduce the drying time from over 10 h to less than 1 h, which was studied kinetically by real-time IR and photo-DSC. A crosslinking mechanism was proposed based on real-time Infrared spectroscopy and solid-state 13C NMR results. Alkyd-based adhesives showed competitive adhesion performance, addressing the obstacles of autoxidatively curing in the absence of oxygen.
Mark Soucek, Ph.D. (Advisor)
Kevin Cavicchi, Ph.D. (Committee Chair)
Toshi Miyoshi, Ph.D. (Committee Member)
Thein Kyu, Ph.D. (Committee Member)
Wesdemiotis Chrys, Ph.D. (Committee Member)
221 p.
Chemistry; Polymer Chemistry; Polymers
Alkyds, Polyesters, Photocuring, Fluorinated, linseed oil, siloxane

Recommended Citations

Citations

  • Salata, R. R. (2017). Modified Alkyds for High Solids Coatings and Adhesives [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1491427043349745

    APA Style (7th edition)

  • Salata, Ryan. Modified Alkyds for High Solids Coatings and Adhesives. 2017. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1491427043349745.

    MLA Style (8th edition)

  • Salata, Ryan. "Modified Alkyds for High Solids Coatings and Adhesives." Doctoral dissertation, University of Akron, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1491427043349745

    Chicago Manual of Style (17th edition)

akron1491427043349745
372
© 2017, some rights reserved.Creative Commons License Modified Alkyds for High Solids Coatings and Adhesives by Ryan Robert Salata 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 Akron and OhioLINK.