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ACRYLATED ALKYDS

Qianhe , Wang
http://rave.ohiolink.edu/etdc/view?acc_num=akron1480688565630661

Abstract Details

2016, Doctor of Philosophy, University of Akron, Polymer Engineering.
Alkyds are essentially oil modified polyesters derived from oils, dibasic acids and polyols. Being bio-renewable, versatile and low-cost made alkyds one of the most consumed coating materials in the world. Conventional solvent-borne alkyd coatings generally contain 30-60 wt% solvents which contribute to hazardous volatile organic compounds (VOCs) emission. Also, the slow autoxidative drying of a conventional alkyd formulation has limited the potential application for alkyds. With the emergence of UV curable coating technology, coating films with no VOC and fast curing speed without thermal requirements have been achieved. In the meantime, high crosslink density from UV curing can give the coating films great resistance properties compared to conventional alkyds. This dissertation is focused on the development of UV-curable alkyd coating systems with no VOC content, fasting curing speed and competitive coating properties. In the first part of this dissertation, four UV-curable alkyd resins were synthesized by functionalizing conventional medium and long linseed oil alkyd with acrylate and methacrylate functional groups. Two compatible reactive diluents (glycerol tri(meth)acrylate) were synthesized similarly. The chemical structures were characterized using 1H NMR, ESI mass spectrometry, and FTIR. UV curing kinetics of UV curable alkyd systems with 0-30 wt% reactive diluent were investigated with real-time FTIR, photo DSC and UV rotational rheometer. Thermal, mechanical, viscoelastic and coating properties were studied with dynamic mechanical analysis (DMA), differential scanning calorimeter (DSC), Instron tensile tester, fracture toughness testing and various coating tests. Design of experiment (DOE) methodology was utilized to study acrylated medium linseed oil alkyd system with three reactive diluents. Design Expert software was used to generate appropriate experimental runs and create mathematical models from response data to predict the property in the experimental region. Results show that UV curable alkyd system based on acrylated medium linseed oil alkyd with 20-30 wt% glycerol triacrylate as reactive diluent have faster curing speed and best overall coating properties compared to other UV curable alkyd systems. The second half of this dissertation focused on elucidating the grafting site and mechanistic pathway for grafting methyl methacrylate (MMA) onto model alkyds. Four model alkyds were prepared using only one of the fatty acids typically found in seed oil. The alkyds were prepared via the fatty acid method with glycerol, phthalic anhydride, and stearic or oleic, or linoleic, or linolenic acid. In this way, the grafting mechanism of each fatty acid could be deconvoluted from the mixture. Model alkyds and model alkyd-acrylate hybrids were characterized with 1H, 2D gHMQC NMR, MALDI-mass spectrometer, solvent extraction, and gas chromatography to elucidate the grafting mechanism. It was found that the mechanism of grafting MMA onto alkyds is mostly dependent on the structure of fatty acid rather than the choice of initiator.
Mark Soucek, Dr. (Advisor)
Thein Kyu, Dr. (Committee Member)
Younjin Min, Dr. (Committee Chair)
Coleen Pugh, Dr. (Committee Member)
Wesdemiotis Chrys , Dr. (Committee Member)
188 p.
Polymers
UV-curable, alkyd, acrylate, methacrylate, kinetics, design of experiment

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Citations

  • Qianhe , W. (2016). ACRYLATED ALKYDS [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1480688565630661

    APA Style (7th edition)

  • Qianhe , Wang. ACRYLATED ALKYDS. 2016. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1480688565630661.

    MLA Style (8th edition)

  • Qianhe , Wang. "ACRYLATED ALKYDS." Doctoral dissertation, University of Akron, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1480688565630661

    Chicago Manual of Style (17th edition)

akron1480688565630661
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This open access ETD is published by University of Akron and OhioLINK.